318results about How to "Guaranteed welding strength" patented technology

The invention provides an electric welding rod with ultra low hydrogen and high toughness. The electric welding rod comprises core welding-wires and electrode coating composition. The electrode coating composition comprises the following components (weight percentage): 38-42 percent of marble, 21-28 percent of fluorspar, 1-3 percent of white titanium pigment, 6-10 percent of ferrotitanium, 0.5-1.5 percent of low-carbon ferromanganese, 3-7 percent of ferrosilicon, 3-6 percent of manganese metal, 2-4 percent of metallic chromium, 1-3 percent of mica, 1-3 percent of ferromolybdenum, 1.5-3.5 percent of ferrovanadium, 1-4 percent of nickel powder and 2-4 percent of rare earth metal. H08A is adopted as the core welding-wires, and water glass is used as the cementing agent. The electric welding rod fills the blank of electric welding rod needed for an ultra-thin large diameter circular saw blade, and simultaneously the electric welding rod can also be used for the welding of products in structures of carbon tool steel, alloy tool steel and spring steel material. The electric welding rod has good welding processing property and crack resistance, and simultaneously has very high welding strength, rigidity, plasticity and toughness, and the color of the welding seam is identical with the color of the base material.

The invention discloses a welding method of a target and a back plate. The welding method comprises the following steps of: providing a titanium target and an aluminium back plate; processing a welding surface of the titanium target into a thread shape, and carrying out roughness processing on the welding surface of the aluminium back plate; sheathing a first mold on the aluminium back plate and covering a second mold on the opposite surface of the welding surface of the titanium target; adopting a hot-pressing method to weld the titanium target and the aluminium back plate to form a target component; and carrying out heat treatment on the target component. According to the technical scheme of the welding method, the bonding strength between the titanium target and the aluminium back plate after welding is higher, the large-area welding of the titanium target and the aluminium back plate is realized, and the cost for producing the target component formed by the titanium target and the aluminium back plate is reduced.

The invention provides a device for welding plastic materials in a laser transmission manner. The device comprises a supporting plate, a laser light source and a pressure regulating mechanism, wherein the pressure regulating mechanism comprises a pressing plate mechanism, a supporting plate, a guide rail and a drive mechanism; the pressing plate mechanism is connected with the drive mechanism andis connected with the supporting plate through the guide rail; the pressing plate mechanism is provided with a light-transmitting window consisting of a light-transmitting window opening and a light-transmitting window body; plastic materials to be welded are positioned on the supporting plate and correspondingly arranged below the light-transmitting window; and the laser light source is sequentially connected with the light-transmitting window and the plastic materials to be welded through laser beams. The invention also provides a welding method realized by the device. According to the invention, the plastic materials to be welded are under proper pressure, and further generate secondary polarization to be combined together, thus welding quality and welding strength are ensured.

The invention provides a welding method for a target assembly. The welding method is used for welding a target and a back plate to form the target assembly. The method includes the steps that the back plate and the target are provided; molten solder is arranged on a welding face of the back plate; a steel brush is used for wetting the welding face of the back plate and the molten solder, and ultrasonic waves are used for processing the welding face of the back plate and the molten solder; the steel brush is used for processing a welding face of the target; and the welding face of the target and the welding face of the back plate are attached so as to weld the target and the back plate. The welding method has the beneficial effects that the contact area between the molten solder and the welding face of the back plate is enlarged, atoms of the solder can be conveniently and more quickly dispersed onto the welding face of the back plate, and therefore the molten solder can conveniently wet the surface of the welding face of the back plate, and the welding quality of the target and the back plate is higher.

An upper half casing member is made of a resin capable of transmitting laser light while a lower half casing member is made of a resin incapable of transmitting laser light. An upper flange portion and a lower flange portion are formed at the respective casing members so as to protrude outwards of a casing from respective peripheral walls thereof. A housing concave part and an upper contact face are formed in the lower face portion of the upper flange portion. A lower contact face is formed in the upper face of the lower flange portion. Laser light is irradiated to the lower flange portion through the upper flange portion to weld the contact faces to each other and to weld an element welding face at the upper face of the lower flange portion to a peripheral part of a filter element.

The invention relates to a molybdenum target welding method, which comprises the following steps of: providing a molybdenum or molybdenum alloy target, a backing plate and a solder; plating nickel on the joint surface of the molybdenum or molybdenum alloy target; preheating the molybdenum or molybdenum alloy target to ensure that the solder is distributed on the joint surface of the molybdenum or molybdenum alloy target; preheating the backing plate to ensure that the solder is distributed on the joint surface of the backing plate; adhering the joint surface of the molybdenum or molybdenum alloy target to the joint surface of the backing plate, and welding to form a target component; and cooling the target component. According to the molybdenum target welding method, the molybdenum or molybdenum alloy target and the backing plate, particularly a copper backing plate can be combined together with high strength, so that the requirement of a sputtering process on high strength is met; and even if the target has large area, the target component, particularly the molybdenum or molybdenum alloy target also can be effectively prevented from being greatly deformed, warped and the like.

The invention discloses a welding method of a tungsten-titanium alloy target, comprising the following steps: providing a tungsten-titanium alloy target, a rear panel and a welding flux; performing nickel plating process on the joint surface of the tungsten-titanium alloy target; preheating the tungsten-titanium alloy target to distribute the welding flux on the joint surface of the tungsten-titanium alloy target; preheating the rear panel to distribute the welding flux on the joint surface of the rear panel; attaching and welding the joint surfaces of the tungsten-titanium alloy target and the rear panel to form a target component; and cooling the target component. The welding method of the tungsten-titanium alloy target of the invention can bind the tungsten-titanium alloy target and the rear panel together, in particular can bind the tungsten-titanium alloy target and the copper rear panel together with higher intensity to meet the requirement of high intensity for the sputtering technology. In addition, the method can effectively restrain the greater deformation, warping and the like of the target component, especially of the tungsten-titanium alloy target even though the area of the target is larger.

The invention provides an inductance element and a method for manufacturing the inductance element. The inductance element can prevent short circuit even though the inductance element gets close to an inductance element which contains Ag on a surface electrode layer on an installing substrate. The inductance element comprises a press powder core body, a coil buried in the press powder core body, and a terminal portion electrically connected with the coil through welding. The terminal portion comprises a Cu base material and a surface electrode layer formed on the surface of the Cu base material. The surface electrode layer is formed by Ag or alloy of Ag. The terminal portion comprises a solder joint portion which is joined with a welding portion welded on the coil relative to the installing substrate by a solder. The thickness of the side of the surface electrode layer which is provided with the welding portion is thicker than the thickness of the side of the solder joint portion.

The invention provides a superlow-hydrogen, high-strength and high-toughness alloy tool steel welding electrode with outstanding anticracking performance, which comprises a core wire and a welding electrode covering composition, wherein the electrode covering composition comprises the following components in percentage by weight: 35 to 45 percent of marble, 20 to 30 percent of fluorite, 2 to 4 percent of titanium white, 8 to 13 percent of ferrotitanium, 0.5 to 1.5 percent of alkali, 3 to 6 percent of metal chromium, 4 to 8 percent of metal manganese, 4 to 8 percent of nickel powder, 3 to 6 percent of ferromolybdenum, 2 to 6 percent of rare earth silicon, 2 to 6 percent of quartz and 2 to 6 percent of feldspar. The core wire is made of H08A steel or H08E steel, and potassium sodium mixed water glass is used as a bonder. The alloy tool steel welding electrode can be used as a superlarge-section alloy tool steel (5CrNiMo) structure welding electrode which used to lack and can be used for welding other high-strength alloy steel structure products. The welding electrode has an excellent welding process property, high welding strength, rigidity, plasticity and ductility.

The invention provides a method for constructing a connection joint between a flat slab and a post cap in a reverse construction method, and relates to the technical field of concrete supporting components. The method aims to solve the problems that in the prior art, a flat slab and a post cap are poured and constructed successively, accordingly, shrinkage cracks are prone to being formed a connection joint, bearing capacity, rigidity and punching-resistant capacity of the flat slab are reduced, reverse construction operations are extremely inconvenient and operation efficiency is reduced. The method includes the following steps that firstly, an upper-layer steel bar and a lower-layer steel bare of the flat slab to be poured and an embedded steel bar, a horizontal hoop rib and radial inclined ribs of the post cap to be poured are distributed surrounding a reserved steel column; a formwork is erected, concrete is poured, the formwork is dismantled after the concrete is hardened, and the flat slab and the post cap, which are connected into a whole, are manufactured. Through the method, the flat slab and the post cap can be poured to form a whole and are connected more tightly, the punching-resistant requirement can be met and stress performance of the connection joint is improved.

A method for welding a copper oxygen lance end for steelmaking with a steel pipe sub uses a medium frequency induction heating device, the copper end and the inner and outer steel pipe sub are rapidly heated by two induction heating coils to respectively reach different optimal preheating temperatures in a short time and then are welded, and induction heating and isothermal annealing treatment is performed for a welding line after welding to sufficiently eliminate residual stress. By adjusting the current strength of an induction heater, the preheating temperatures of the copper end and the inner and outer steel pipe sub can be precisely regulated and controlled according to process requirements, heating is rapidly performed, an oxidation layer is decreased, the strength of the welding line is improved, and production efficiency is improved while the welding quality of the oxygen lance end is ensured.

The invention relates to an automatic welding device and an automatic welding method for welding straight fins on the inner wall of a long small-bore seamless steel tube, which are characterized in that: the automatic welding device consists of a power-supply control device, a frame (10), a driving device (1), a travelling mechanism (9), a support arm (6), a regulating device (7) of the support arm (6), a wire feeder (8) and a welding gun head (4) with a wire spitting orifice of solder wires; and the automatic welding method comprises that: a steel tube (2) to be welded is fixed relative to the travelling mechanism (9); a straight fin (11) is arranged in the steel tube (2) and are fixed relatively; the welding gun head (4) aligns with a welding starting point, the travelling mechanism (9) is started, and simultaneously the wire feeder (8) and the welding gun head (4) are started for welding; when the travelling mechanism (9) travels, the welding gun head (4) enters the steel tube (2) to perform movable welding along a welding line; and when the welding gun head (4) welds to the end point of the welding line, a travel switch acts, the wire feeder (8) stops feeding the wires, and the welding gun head (4) stops welding so as to complete the welding of one straight fin (11).

The invention relates to a preparation method of foamed-aluminum sandwiched-structure materials and belongs to the technical field of aluminum brazing. The preparation method includes steps of mixing blazing filler metal with brazing flux into paste to apply on surfaces to be brazed of foamed aluminum and aluminum plates, assembling a to-be-brazed structure according to a mode of the aluminum plate / foamed aluminum / the aluminum plate, brazing in a furnace at the protective atmosphere to obtain the foamed-aluminum sandwiched-structure materials after totally drying. The brazing filler metal comprises, by mass percentage, 11-13% of Zn, 14-16% of Si, 0.8-1.2% of Fe, 0.1-0.3% of Mg, 0.2-0.4% of Mn and the balance of Al. The brazing flux comprises, by mass percentage, 40-50% of KF and 50-60% of AlF3. By adopting the novel brazing filler metal and the brazing flux and strictly controlling brazing temperature and time, the prepared foamed-aluminum sandwiched-structure materials have excellent performance. Complicated procedures in brazing are greatly reduced, operation efficiency is greatly improved, and cost is saved.

The invention discloses a two-step hot isostatic pressing diffusion welding method for a tungsten target assembly, and belongs to the technical field of magnetron sputtering target manufacturing. According to the welding method, hot isostatic pressing diffusion welding is carried out on a tungsten target blank and an Al intermediate layer, then secondary hot isostatic pressing diffusion welding iscarried out on the tungsten target blank and a copper back plate, finally, the tungsten target material assembly is obtained, and the welding strength of the tungsten target blank-Al intermediate layer welding face of the tungsten target material assembly is larger than or equal to 125 MPa, the welding strength of the Al intermediate layer-copper back plate welding face is larger than or equal to65 MPa, the welding-on rate of the two welding faces is larger than 99.5%, the overall deformation degree of the target material after welding is small, the target material is suitable for a high-power sputtering machine table, and it is guaranteed that desoldering and target falling are avoided in the sputtering process.

The invention discloses a saddle forming process for an interface between main pipe and branch pipe with an inclination angle and a welding method thereof. The saddle forming process comprises the following steps: a metal block consistent with outside dimension of the main pipe and the branch pipe is punched, an elliptical hole is punched on the metal block according to the inner diameter of the branch pipe, the elliptical hole is stretched to be a boss according to the inclination angle between the main pipe and the branch pipe, the metal block is punched according to the outer diameter of the main pipe to form a curved surface consistent with peripheral curvature of the main pipe, the surplus part of the metal block periphery is cut off according to the size of a welded surface, etc. The welding method comprises the following steps: a hole is drilled at the place where the main pipe needs a branch; one end of the branch pipe is welded with the boss of the saddle; and the curved surface on the saddle consistent with the peripheral curvature of the main pipe is jointed and welded with the borehole position on the main pipe, etc. The saddle forming process for the interface between the main pipe and the branch pipe with the inclination angle and the welding method thereof guarantee the welding flatness and the welding intensity, and avoid the obstruction resulting from inserting the branch pipe into the main pipe.

The invention provides an austenitic stainless steel argon tungsten-arc welding active agent and relates to the field of activators for welding. The active agent provided by the invention is composedof oxides and is poisonless and harmless. After the active agent is added, the quantity of metallic vapor generated on the surface of a molten pool is restrained, under the circumstance of little metal vapor, only metal within a small range near an anode spot rises, is gasified and ionized, thus an arc electric conduction channel is tightened, arc pressure is increased, flowing of metal liquid inthe molten pool is quickened, enlarged and deepened, fusion depth is increased substantially, and 16-mm single face welding and double face shaping can be achieved. In addition, SiO2 enables the content of Si in a weld joint to be increased slightly through metallurgic reaction, Si has a direct influence on a solidification mode, Si can increase w(Cr)eq / w(Ni)eq, the development of FA solidification mode is facilitated, the ferritiszation effect is facilitated, generation of a delta phase can be facilitated, the development of austenitic dendrites is hindered, and mechanical properties of a weld joint structure are improved.

The invention relates to a welding structure of seamless steel rails with smooth operation up and down and large carrying capacity of welding seams. The reinforced welding structure of the seamless steel rails with smooth operation up and down belongs to the technical field of welding of steel rails of trains. The welding structure of the invention comprises steel rails and welding seams, wherein the connecting parts of the steel rails are in inclined surfaces which are connected in a welding way; the inclined surfaces at the connecting parts of two parallel steel rails are asymmetrically arranged in a staggered way; the staggered length is larger than the length of a section of carriage; and each inclined surface is determined by being parallel with the y axis and forming 45 degree or 60 degree angle with the x axis. The inclined welding surfaces of the invention can prevent wheels from bumping up and down when the wheels pass through the welding seams; compared with straight welding surfaces, the inclined welding surfaces can increase the welding area, reduce pure positive tension stress and pure shearing stress, and can increase the carrying capacity of the steel rails to the wheels; and even the aluminothermic welding is adopted, the welding strength and welding reliability can also be ensured, and the aluminothermic welding can improve the welding efficiency, simplify the welding technology and save the welding cost and can be operated in an on-line way. The invention is especially suitable for welding seamless long rails of heavy load trains and high-speed CRH, and can also be used for welding seamless steel rails of urban rail trains.

A compressor where welding between a casing and an inner component or welding between a barrel casing and an end casing has sufficient strength and the welding has low strain achieved by suppressing an influence of heat by welding. A method of producing the compressor (1, 101) has a positioning process and a welding process. The compressor has the casing (10, 11, 111) and the inner component (60, 125) received in the casing. The casing has at its inner surface (11s, 111s) a first section (11a, 11w, 111w), and the inner component has a second section (60a, 61, 125b). The second section faces the first section. The first section and the second section are made to face each other in the positioning process. In the laser welding process, a laser beam is applied to at least a portion of the part where the first section and the second section are faced each other to laser-weld the casing and the inner component together.

The invention discloses a clamp for laser welding of a double-metal band saw blade. The clamp comprises a guide roll, a first positioning wheel group, a double pressing roll group, a second positioning wheel group, a pressing mechanism and a third positioning wheel group which are arranged on the same horizontal line in turn, wherein each positioning wheel group comprises two positioning wheels which are positioned on the same horizontal plane and of which the wheel surfaces are vertically aligned, and a fixing seat for fixing the positioning wheels; the pressing mechanism comprises two pressing blocks; one sides of the two pressing blocks close to the third positioning wheel group are convexly provided with clamping parts; a plurality of convex ribs vertical to the horizontal line are correspondingly arranged on clamping surfaces of the two clamping parts; and the tail ends of the clamping parts are positioned in the middle of the third positioning wheel group. The welding strength and welding line of saw blade back materials and solder wires can be well guaranteed through the guide roll, the double pressing roll group, the positioning wheel groups and the pressing mechanism, andthe whole set of clamp has a simple structure and is low in manufacturing cost and convenient to install and maintain.

The invention discloses a vacuum electron beam welding method for an aluminum alloy metal diaphragm storage tank. The method comprises the following steps of (1) processing two hemispherical electronbeam welding tools, wherein six notches are uniformly distributed on the hemispherical electron beam welding tools; (2) clamping a support ring, a metal diaphragm and an air cavity shell by utilizinga first electron beam welding tool; (3) firstly, positioning and welding the support ring and the metal diaphragm in a segmented mode, secondly, positioning and welding the support ring and the air cavity shell through the gap of a tool, and finally, welding the support ring and the metal diaphragm through electron beams in the whole circumference; (4) removing the first electron beam welding tool, clamping all the components on the second electron beam welding tool, wherein a liquid cavity shell is located below the second electronic beam welding tool, firstly positioning and welding the support ring and the liquid cavity shell through the gap of the tool at first, and welding the support ring and the air cavity shell by the electron beams in the whole circumference; and (5) removing thesecond electron beam welding tool, clamping the product by using the first electron beam welding tool, and welding the support ring and the liquid cavity shell by using the electron beams in the wholecircumference. Through the method disclosed by the invention, the internal quality qualification rate and the welding line strength of the electron beam welding line of the aluminum alloy metal diaphragm storage tank are improved.

The invention discloses a welding method of a target material assembly and a target material assembly welding structure. The welding method comprises the steps that a target material and a back plateare buckled, a step of a step area is embedded in a groove of a groove area, a first welding face of a first surrounding area and a second welding face of a second surrounding area abut against each other, an assembling gap is formed between the first welding face of the step area and the second welding face of the groove area, a welding material layer is located in the assembling gap, and the welding material layer and the first welding face of the step area make contact, after buckling, multiple pressing blocks are symmetrically placed on the back face of the target material, the pressing blocks are symmetric about the center point of the back face of the target material, after the pressing blocks are placed, the target material and the back plate are subject to heating welding treatment. Welding strength between the target material and the back plate is ensured, the appearance of the welding line between the target material and the back plate is improved, the target material is prevented from twisting and deforming towards the middle, and the quality of the welded target material assembly is improved.

The invention discloses a leadless ceramic chip carrier packaging structure and a process for manufacturing the same. The packaging structure comprises a shell and a cover plate. The cover plate covers the shell; the shell is a multilayer ceramic plate, a chip adhesion zone is arranged in the center of the upper surface of the multilayer ceramic plate, and lead bonding zones are arranged on the periphery of the chip adhesion zone; a pad is arranged in the center of the lower surface of the multilayer ceramic plate, and leading-out-end pads are arranged on the periphery of the pad and are connected with the lead bonding zones; a plurality of metal via holes are vertically formed in positions between the upper surface and the lower surface of the multilayer ceramic plate, the upper ends of the metal via holes are connected with the chip adhesion zone, and the lower ends of the metal via holes are connected with the pad; the leading-out-end pads and the pad are of tungsten metallization layer structures. The leadless ceramic chip carrier packaging structure and the process have the advantages that the leading-out-end pads are provided with tungsten metallization layers instead of the traditional pads which are formed by means of brazing metal blocks on ceramics, accordingly, technologies for machining and brazing metal parts and the like can be omitted, the shell manufacturing yield can be increased, and the cost of the shell can be greatly reduced.

The invention discloses a technology for welding a carbon steel overlaying welding layer of a tube plate of a high pressure heat exchanger with a low carbon steel tube in a sealing way, comprising the following technological processes, i.e. a step one of welding carbon steel on the tube plate of the high pressure heat exchanger in a submerged arc overlaying way, thermally treating the overlaying welding layer and the tube plate under the condition of passing 100% UT (Ultrasonic Test) and 100% MT (Magnetic Test) flow detection, and increasing the overlaying welding layer to the range of 6mm to 8mm in a machining way, wherein the groove structure of the tube plate is in the form of an aligned groove, the low carbon steel tube is aligned with the overlaying welding layer of the tube plate, and the sealing welding groove of the overlaying welding layer of the tube plate is chamfered at 2*45 degrees; a step two of preheating to 80 DEG to 100 DEG before welding, and welding the low carbon steel tube in the groove of the overlaying welding layer of the tube plate in a point way before welding as well, wherein the point welding enables the root part to be thoroughly welded without welding sticks; a step three of implementing sealing welding on the groove by adopting an automatic argon arc welding, implementing 100% PT (Penetration Test) flow detection on the welded junction after the completion of sealing welding, and eliminating surface defects of the welding line. According to the technology for welding the carbon steel overlaying welding layer of the tube plate of the high pressure heat exchanger with the low carbon steel tube in the sealing way, the surface of the welding line of the carbon steel subjected to the sealing welding is smooth and flat, and no needle-like air holes are formed in the near surface and the surface of the welding line; therefore, the long-term scour by supplied water can be completely withstood.

The invention relates to the technical field of welding, in particular to a welding method of a copper tube. The welding method comprises the following steps: a surface of the copper tube to be welded is cleaned; a groove and two ends of the copper tube to be welded are preheated; a clamping device is arranged at the groove of the copper tube to be welded, the inlet / the outlet for a welding torch is formed in the clamping device, when the welding torch is placed in the inlet / the outlet, the clamping device and the outer wall of the copper tube to be welded form a closed space, the groove of the copper tube to be welded is heated after vacuumizing, a flux is coated at welding parts, a chromium nickel stainless steel electrodes and silver electrodes are respectively placed at different welding parts to carry out a primary welding and a secondary welding, the silver electrodes are fixed between the outer wall of the copper tube to be welded and the clamping device by the clamping device; after the silver electrodes are molten completely, the power is shut off, and heat preservation is carried out, and the clamping device is removed. The welding method of the copper tube disclosed by the invention enhances the welding strength and sealing of the copper tube, and further reduces the generation of air holes in welding parts and improves the quality for the welded copper tube.

The invention provides a friction stir welding assembling tool for large-scale ellipsoidal workpieces. The friction stir welding assembling tool comprises a fixing base, a lifting die bed, adjusting mechanisms, mechanical pressing strips and lifting mechanisms, wherein the workpieces are attached to the lifting die bed, the positions of the workpieces on the lifting die bed are adjusted through the adjusting mechanisms fixed to the lifting die bed; the two ends of the mechanical pressing strips are fixed to the lifting die bed; each lifting mechanism comprises limiting stop blocks, a hydrauliccylinder, guide shafts and a hydraulic cylinder base, wherein the multiple guide shafts are fixedly arranged on the hydraulic cylinder base through threads, the hydraulic cylinder is fixed in the middle of the hydraulic cylinder base through threads, and the limiting stop blocks are arranged on the hydraulic cylinder base; a plurality of guide holes and a threaded hole are machined in the bottomof the lifting die bed and are connected to the guide shafts and the push rods of the hydraulic cylinders correspondingly; each adjusting mechanism consists of an adjusting base and an adjusting screw; and the positions of the workpieces can be finely adjusted by rotating the adjusting screws. According to the friction stir welding assembling tool, the friction stir welding production efficiency of the large-scale ellipsoidal workpieces can be improved, and in-situ edge milling and welding can be realized.

The invention discloses a multi-unit synthesis type reflector based method for manufacturing a power type vertical light emitting diode. The method micro-isolates the reflector of the power type vertical light emitting diode to form the multi-unit synthesis type reflector, greatly reduces the influence of thermal stress generated in a high-temperature welding process on Ag and semiconductor surface adhesive force, further fills highly resistant materials with equal altitude in each unit reflector micro-isolation belt, provides a flat welding surface to ensure welding strength, realizes high yield of the power type vertical light emitting diode, and simultaneously realizes the current blocking structure design to improve the luminous efficiency of the power type vertical light emitting diode.

The invention relates to an electron beam welding method for a molybdenum alloy and a tungsten alloy, and belongs to the technical field of welding processes. The method comprises the following steps of: separately performing thermal treatment on a molybdenum alloy component and a tungsten alloy component, and assembling the molybdenum alloy component and the tungsten alloy component subjected to thermal treatment with an assembly gap not greater than 0.04 mm; performing electron beam welding on the assembled molybdenum alloy component and the assembled tungsten alloy component, deflecting electron beam current to the molybdenum alloy component during welding, and enabling distance between a surface butt-joint line of the molybdenum alloy component and a surface butt-joint line of the tungsten alloy component to be 0.05-0.25 mm; and performing vacuum thermal treatment on the welded components. The welding method provided by the invention is high in cooling speed, is small in welding seam crystalline grain, is relatively small in dimension of a second phase, is beneficial for improving welding seam performances, is good in welding seam surface forming, is relatively high in welding seam internal quality, is high in mechanical property, has welding seam strength greater than 250 MPa, is high in sealing performance, is small in welding seam width and is high in reliability.