35results about How to "Reduce production and processing steps" patented technology

Disclosed is a production method of porous ceramic composite tiles. The production method includes steps of blending of raw materials of existing ceramic tiles, ball milling, spray drying, forming by dry pressing or extruding, drying again, decorating, high-temperature sintering, edge finishing and the like. Particularly, porous ceramic and non-porous ceramic are composited during forming and are subjected to one-step co-firing, blank firing shrining agents and foaming agents are contained in a raw material formula of the porous ceramic, and in the porous ceramic blank, the general ceramic tile blank accounts for 100 parts of the total weight, the blank firing shrinking agents account for 20-150 parts of the total weight, and the foaming agents account for 0.03-20 parts. As the porous ceramic layer and the non-porous ceramic layer are composited in the forming stage and then fired in a kiln at one step, energy consumption for one more firing can be reduced, and required porous composite ceramic products with unique and excellent performance can be produced.

The invention relates to a self-positioning vacuum brazing technique for a multi-cavity electrical bridge waveguide. The self-positioning vacuum brazing technique comprises the following steps of preparing materials and finishing the machining of an upper part and a lower part of the waveguide; respectively carrying out surface treatment on the machined upper and lower parts of the waveguide; producing brazing filler metals according to overall dimensions of the upper part and the lower part of the waveguide and assembling the upper part and the lower part of the waveguide and the brazing filler metals; matching the assembled electrical bridge waveguide with a work fixture and placing the assembled electrical bridge waveguide and the work fixture into a vacuum aluminum brazing furnace; carrying out vacuum brazing on the multi-cavity electrical bridge waveguide according to a vacuum brazing temperature process curve; carrying out numerical control machining on the shape of the waveguide and a ring flange; drilling and carrying out electrochemical treatment. According to the self-positioning vacuum brazing technique disclosed by the invention, the ring flange and a waveguide tube are integrally formed at one time, so that the processing work procedures are simplified, and the production period is short; a groove and a shoulder are arranged, so that self positioning is realized, combined times are reduced, and the assembly precision is high; one-time welding forming is realized by adopting vacuum brazing, and thus the deformation of cavities caused by multiple times of welding is avoided; in addition, no brazing flux is needed, and thus the corrosion of the brazing flux to the cavities is avoided, and the service life of the multi-cavity electrical bridge waveguide is prolonged.

The invention relates to the technical field of spandex coating yarn, in particular to dacron-chinlon-spandex coating yarn and a preparation process thereof. According to the preparation process, firstly, dacron yarn POY and chinlon yarn POY are drawn out by corresponding yarn racks, and a false twisting machine platform is adopted for finishing the following processes of (1) feeding a first roller of the false twisting machine platform with the decron yarn POY and the chinlon yarn POY which are drawn out by the yarn racks, after the decron yarn POY and the chinlon yarn POY are wound and combined by the first roller, conducting heating by a deformation heating box, conducting cooling by a cooling plate, conducting twisting by a false twisting machine, and obtaining decron-chinlon combined yarn; (2) feeding a second roller with spandex yarn and the decron-chinlon combined yarn obtained in the step (1), after the decron-chinlon combined yarn is combined with the spandex yarn by the second roller, putting the newly combined yarn above into an air interlacing jet, conducting air injection bonding through the air interlacing jet, and then feeding a winding device with the combined yarn for conducting winding formation processing after the combined yarn is processed by a third roller. According to the preparation process, preparation of the dacron-chinlon-spandex coating yarn can be completed by a one-step method, and the obtained dacron-chinlon-spandex coating yarn is high in bonding degree and uneasy to detach and fracture, and after being dyed, the dacron-chinlon-spandex coating yarn can achieve an effect of presenting double colors in different shades.

The invention discloses a drying hair-absorbing device used for flocked cloth production. The drying hair-absorbing device used for flocked cloth production comprises a tank body, roll shafts, an electric heating tube, a hair absorbing mechanism, a gas suction pump, a filter tank, and flocked cloth; the three roll shafts are arranged in the tank body from left to right successively; from the leftside of the internal part of the tank body, the former two roll shafts are arranged at a same horizontal plane, and the roll shaft on the right side is arranged below the former two roll shafts; fromleft to right, the three roll shafts are winded by the flocked cloth; three square pipes are arranged above the horizontal segment of the flocked cloth from left to right uniformly in a longitudinal row. A gas outlet terminal of the gas suction pump is connected with a heating cylinder through a pipeline, so that air heating is realized; heated air is blown onto the flocked cloth through wind blowholes of the three uniformly arranged square pipes, so that flocked cloth drying is realized, and flocked cloth drying efficiency is increased; the hair absorbing mechanism is arranged at the inclined segment of the flocked cloth, and a wind suction opening of the hair absorbing mechanism is provided with a plurality of combing plates, so that un-bonded flocking on the flocked cloth are combed tobe vertical using the combing plates, and are removed through suction, so that excellent hair suction effect is achieved.

The invention discloses a manufacturing method for the interior ceiling of an automobile. The method comprises the following steps: S1, providing an upper die and a lower die of a die, wherein the upper die and the lower die of the die fit each other; S2, providing a non-woven fabric and a glass fiber mat which are successively arranged from top to bottom, allowing the non-woven fabric and the glass fiber mat to be absorbed on the lower surface of the upper die to complete positioning so as to form a back material and perforating a material injection hole in the back layer which has undergone positioning; S3, providing a glass fiber mat, a non-woven fabric and a fabric which are successively arranged from top to bottom and allowing the glass fiber mat, the non-woven fabric and the fabric to be absorbed on the upper surface of the lower die to complete positioning so as to form a surface material; S4, pressing the upper die and the lower die together so as to trim the back layer having undergone positioning and the surface layer having undergone positioning and to seal boundaries and defining a cavity between the back layer having undergone positioning and the surface layer having undergone positioning; and S5, injecting a material from the material injection hole into the cavity and carrying out curing so as to form semi-hard PU, thereby obtaining the interior ceiling of the automobile. With the manufacturing method for the interior ceiling of the automobile disclosed in the embodiments of the invention, production procedures are reduced.

The invention relates to the technical field of mobile phone shells, specifically to a high-strength high-surface aluminum alloy for a mobile phone shell and a preparation method therefor. The aluminum alloy comprises the following chemical components in percentage by weight (wt%): 0.70%-1.4% of Si, less than or equal to 0.15% of Fe, 0.60%-1.0% of Cu, 0.50%-0.80% of Mn, 0.60%-1.20% of Mg, less than or equal to 0.015% of Ti, less than or equal to 0.05% of other singles, and the balance of aluminum. According to the aluminum alloy for the mobile phone shell, the appearance requirement and the strength requirement of the high surface of the aluminum alloy for the mobile phone shell are combined, a new aluminum alloy chemical component and a preparation process are optimally designed, the yield strength of the alloy is greatly improved while the high surface quality of the aluminum alloy for the mobile phone shell is guaranteed, and the use requirement of a mobile phone shell material is met. The aluminum alloy is anodized after CNC, the defects of material lines, so that black spots, black lines, chromatic aberration and piebald spots are avoided, and the rejection rate caused by the defects is greatly reduced; and meanwhile, the aluminum alloy is high in yield strength, and the yield strength of the aluminum alloy is not lower than 360 MPa.

The invention discloses a graphite crucible vibration forming die. The die comprises an upper die body, a lower die body and a vibration table; the forming die is used for enabling a graphite crucibleto be formed at a time, an obtained graphite crucible preliminary product can be directly machined and polished, a finished product is obtained, the production step is reduced, labor time and labor force are saved, production cost is greatly reduced, the production and machining step of the graphite crucible is reduced, and the produced graphite crucible is high in density, uniform and stable inquality. Due to the fact that in the production process, emissions of waste water and waste gas in the dipping and graphitization process are reduced, energy saving, sewage reduction and emission reduction are achieved, and the positive effect on protecting the environment is achieved.

The invention relates to a vehicle environment-protective hydrogen preparation supply method and a hydrogen engine. The invention is characterized in that the invention is carried out according to the following steps: first, H2 is produced by pure water, the purity of the H2 reaches more than 99.9 percent, P of the H2 equals 0.4Mpa, the H2 passes through a first gas storage tank, a second gas storage tank and a third gas storage tank, then the H2 is compressed by a compressor, the compressor can produce H2 the P of which equals 30Mpa, and at last the H2 is delivered to the gas storage tank of a transporter by a gas filling machine which can produce H2 the P of which equals 30Mpa; second, the gas storage tank is transported to a gas filling station, a gas outlet of the gas storage is connected with a gas transporting pipeline, the H2 passes through an H2 desiccator through the gas transporting pipeline to eliminate moisture in H2 gas, then the H2 goes into the gas storage tank, then the H2 goes into the compressor which produces H2 the P of which equals 30Mpa from an output of the gas storage tank to be compressed, at last the H2 is delivered to the gas filling machine which produces H2 the P of which equals 30Mpa, and H2 fuel is added to the a fuel tank of a vehicle by the gas filling machine. The method not only can supply H2 energy to a car as power, but also is environment protective and has great available resources, has little cylinder body and cylinder cover steel plate welding stamping molding process, has strong rigidity, and is durable.

This is a kind of connecting rod of hermetic compressor and its producing method. The connecting rod includes piston connecting part set in the piston and connected to the inside of piston in certain angular range; main body part with its one end connected to the said piston connecting part; and crank axle-connecting part that envelops the other end of the said main body part and is set at the other end of the said main body part. The producing method includes piston connecting part and main body part are produced; one side of the said piston connecting part and one end of the said main body part are combined; the other end of main body part is enveloped in the crank axle connecting part in order to make the crank axle connecting part assemble at the other end of the said main body part.

The invention discloses an underground pipe gallery cast-in-situ aluminum film construction method. The underground pipe gallery cast-in-situ aluminum film construction method comprises the steps thatpaying off before construction is carried out; wall aluminum templates are installed after paying off; mold removal is carried out after wall pouring; and as for installation of the wall aluminum templates, firstly, after a bottom plate and guide wall steel bars are installed, internal braces are arranged at the positions of the horizontal distances and the vertical distances between the steel bars and all wall-through screws, the internal braces are the same as a wall in width, the upper and lower surfaces of the inner braces are horizontal, and the left and right directions of the internalbraces and the wall line form right angles. By means of the underground pipe gallery cast-in-situ aluminum film construction method, through the arrangement of a series of structures, the constructionquality of a pipe gallery can be ensured in the implementation process, and meanwhile, a user can conveniently uses a mold.

The invention belongs to the technical field of automatic control and relates to a CAN bus connector of a controller module. The CAN bus connector comprises a housing. The housing is internally provided with a module circuit board. The two sides of the module circuit board are connected with a male connector and a female connector respectively. The male connector extends out of the housing; the female connector is arranged in the housing; and the male connector and the female connector are matched, and when two CAN bus connectors draw near to each other, the male connector of one CAN bus connector can be inserted to the female connector of the other female connector to enable the two CAN bus connectors to realize electric connection. The CAN bus connector is reliable and quick to connect and high in stability.

The present invention relates to the field of food production and processing, especially to a food heating and mixing bucket with a sensor. The food heating and mixing bucket includes a bucket body and a bucket cover. A motor is arranged on an outer part of the bucket body and is connected to a rotating shaft which extends deep into the inside of the bucket body. Stirring rods are distributed in the rotating shaft. An air inlet port is arranged in an external part of the bucket body and is connected with an air pipe. The bucket cover is disposed on one side of the upper end of the bucket body. One temperature sensor is disposed on the rotating shaft inside the bucket body. The food heating and mixing bucket with the sensor has advantages and positive effects that the temperature sensor added into the bucket can be used to control the temperature inside the bucket to prevent waste of vapor and prevent the temperature inside the bucket form going too high to affect the quality of candies.

The invention relates to a motor rotor molding mold, which comprises a lower mold and an upper mold, wherein the center of the upper mold is provided with an upper casting hole, the lower end surfaceof the upper mold is provided with an upper end plate groove, the upper end of the lower mold is provided with a lower end plate groove, and a fixed shaft hole is arranged below the lower end plate groove. The motor rotor processing method uses the molding mold, and comprises: S1, inserting the lower end of a motor rotating shaft into the fixed shaft hole; S2, placing a rotor punching sheet on theupper end surface of the lower mold, wherein a lower end plate casting cavity is formed between the lower end surface of the rotor punching sheet and the lower end plate groove, and an insulating layer casting cavity is formed between the motor rotating shaft and the inner wall of the shaft hole; S3, placing the upper mold on the upper end of the rotor punching sheet, wherein an upper end plate casting cavity is formed between the upper end of the rotor punching sheet and the upper end plate groove; and S4, injecting a casting liquid from the upper casting hole, and taking out a motor statorafter carrying out cooling curing. According to the present invention, the production processing steps are reduced, the processing efficiency is improved while the quality of the motor rotor is ensured, and the cost can be reduced.

The invention relates to a high-precision waveguide power divider and a processing method thereof. The high-precision waveguide power divider is formed by subjecting an upper chamber and a lower chamber to vacuum soldering; a solder pad is made by laser cutting; a power divider chamber formed includes a main chamber and an auxiliary chamber. The high-precision waveguide power divider is characterized in that a welding face of the upper chamber is provided with a groove, the lower chamber is correspondingly provided with a shoulder, the upper chamber and the lower chamber are positioned duringwelding through the combination of the groove and the shoulder, the main chamber and auxiliary chamber of the lower chamber are integrated separately to main flange half plate I and auxiliary flange half plate II; after the upper chamber and the lower chamber are welded together, the main flange half plate I and a main flange half plate II form a main flange plate; the auxiliary flange half plateI and an auxiliary flange half plate II form an auxiliary flange plate.

The invention discloses an anti-slip bottom sheet, the raw material composition and weight ratio of which are as follows: alumina: 0.5-1.0%, calcium carbonate: 1.5-3.0%, silicon dioxide: 8-10%, dimethyl dithio Sodium carbamate: 0.5‑1.0%, stearic acid: 1‑2%, zinc oxide: 0.8‑1.5%, sulfur: 1.5‑3%, carbon black: 3‑5%, nitrile rubber: 73.5‑83.2%; The invention also proposes a non-slip film production and preparation mechanism, which includes a shell and a base, the shell is provided with a stirring mechanism, the lower end of the shell is provided with a feeding mechanism, the base is fixed with a bottom plate, A lower module is detachably connected to the bottom plate, an oil cylinder is fixed on one side of the base, a connecting block is fixed on the upper end of the oil cylinder, and a top plate is fixed on the lower end of the connecting block. The invention can process the raw materials to make them fully mixed, so as to improve the quality of the raw materials, facilitate transportation, quickly pour, and quickly take out the formed products, thereby improving production efficiency and product quality.

The invention discloses a machine head for cutting and processing an irregular steel bar. The machine head comprises a transmission case (7), wherein a transmission mechanism (71) is arranged inside the transmission case (7); cutter mounting bases (8), equal with the cutting faces of the irregular steel bar in number, are arranged on the transmission case (7); a cutting tool (12) capable of rotating around a center axis is mounted in each of the cutter mounting bases (8); the cutting tools (12) are distributed in a ring array manner; the tool noses of the cutting tools (12) are towards the inner side; included angles are formed by the rotating centers of the cutting tools (12) and the center points of the ring array of the cutting tools (12); the cutting tools (12) are driven by the transmission mechanism (7) to be rotated. The machine head disclosed by the invention can effectively improve the producing and processing efficiency of the irregular steel bar, and meanwhile reduce the producing and processing cost of the irregular steel bar.

The invention relates to a self-positioning vacuum brazing technique for a multi-cavity electrical bridge waveguide. The self-positioning vacuum brazing technique comprises the following steps of preparing materials and finishing the machining of an upper part and a lower part of the waveguide; respectively carrying out surface treatment on the machined upper and lower parts of the waveguide; producing brazing filler metals according to overall dimensions of the upper part and the lower part of the waveguide and assembling the upper part and the lower part of the waveguide and the brazing filler metals; matching the assembled electrical bridge waveguide with a work fixture and placing the assembled electrical bridge waveguide and the work fixture into a vacuum aluminum brazing furnace; carrying out vacuum brazing on the multi-cavity electrical bridge waveguide according to a vacuum brazing temperature process curve; carrying out numerical control machining on the shape of the waveguide and a ring flange; drilling and carrying out electrochemical treatment. According to the self-positioning vacuum brazing technique disclosed by the invention, the ring flange and a waveguide tube are integrally formed at one time, so that the processing work procedures are simplified, and the production period is short; a groove and a shoulder are arranged, so that self positioning is realized, combined times are reduced, and the assembly precision is high; one-time welding forming is realized by adopting vacuum brazing, and thus the deformation of cavities caused by multiple times of welding is avoided; in addition, no brazing flux is needed, and thus the corrosion of the brazing flux to the cavities is avoided, and the service life of the multi-cavity electrical bridge waveguide is prolonged.

The invention provides a compression roller adjusting mechanism of a calender. The compression roller adjusting mechanism comprises a driving compression roller and a driven compression roller, wherein the driving compression roller and the driven compression roller respectively penetrate through a rack of the calender; a calendering channel for allowing a flour raw material to pass through is arranged between the driving compression roller and the driven compression roller; the driving compression roller and the driven compression roller are connected through a transmission mechanism; two ends of the driven compression roller are respectively supported on the rack of the calender through eccentric sleeves; a worm and gear assembly is arranged on the driven compression roller; a gear of the worm and gear assembly is fixedly connected with the end surfaces of the eccentric sleeves; a worm sleeve is arranged on an input shaft in a sleeving manner; the input shaft is supported on the rack and is connected with an output shaft of external driving equipment; and the worm sleeve is meshed with the gear. The compression roller adjusting mechanism has the beneficial technical effects that the compression roller adjusting mechanism has the effects of reducing the cost and being stable in operation, composite noodles are provided, the types of the noodles are enriched, the taste, the quality and the production efficiency of the noodles are improved, the production efficiency of a cooked wheaten food production enterprise is improved, and the enterprise cost is reduced.

The invention discloses a shielding film with good humidity and heat resistance. The shielding film adopts a four-layer structure including a tempered glass film, a waterproof breathable film, an electromagnetic shielding film and a thermal-insulating film, wherein air channels are arranged in the tempered glass film, the electromagnetic shielding film and the thermal-insulating film; steel wires are arranged in the tempered glass film, the waterproof breathable film, the electromagnetic shielding film and the thermal-insulating film; anti-static particles are arranged between the tempered glass film, the waterproof breathable film, the electromagnetic shielding film and the thermal-insulating film. The shielding film has the benefits as follows: the waterproof breathable film and the thermal-insulating film are arranged in the shielding film with good humidity and heat resistance, heat transfer in the shielding film can be blocked, air in the film can freely flow along the air channels, the situation that the inside of the film is in a humid and hot environment for a long time is avoided, and the shielding film has good humidity and heat resistance, requires few production processing procedures and is simple in process, low in cost and good in practicability.

The invention relates to a waste removal device of an unwinding type die-cutting machine. The waste removal device comprises a waste half-removal mechanism, a waste full-removal mechanism and a paperand scrap edge drive mechanism. The waste half-removal mechanism comprises an upper waste half-removal die plate and a lower waste half-removal die plate; the upper waste half-removal die plate is connected with a waste half-removal cam drive unit and moves up and down; the lower waste half-removal die plate is stationary; and a scrap edge collection unit is arranged on the lower portion of the waste half-removal mechanism. The waste full-removal mechanism comprises an upper waste full-removal die plate and a lower waste full-removal die plate; the upper waste full-removal die plate is connected with a waste full-removal cam drive unit and moves up and down; the lower waste full-removal die plate is stationary; and an automatic stacking and lifting unit for collecting finished products isarranged on the lower portion of the waste full-removal mechanism. The paper and scrap edge drive mechanism comprises a drive roller and a plurality of driven rollers, and the drive roller and the driven rollers are used for clamping the products therebetween. By means of the waste removal device, scrap edges, generated after die-cutting, of the products can be effectively removed, the manual waste removal operation is omitted, the number of production and processing procedures is reduced, product transfer is accelerated, the products are fully stripped off and automatically stacked, the production efficiency is high, and the waste removal device shows the energy-saving, cost-saving and environment-friendly concepts.

The invention relates to a necking device for copper pipes. The necking device comprises a machine table, and a feeding mechanism, a pushing mechanism and a necking mechanism arranged on the machine table, wherein the feeding mechanism is used for sorting the copper pipes and then conveying the copper pipes to the pushing mechanism one by one; the pushing mechanism is arranged on one side of the feeding mechanism and is used for pushing the copper pipes, which are conveyed to the pushing mechanism through the feeding mechanism, to the necking mechanism; the necking mechanism comprises a copper pipe fixing device and a necking rotary disc which are arranged on the machine table; the copper pipe fixing device is arranged close to the pushing mechanism and is used for fixing the copper pipes pushed by the pushing mechanism; the necking rotary disc is arranged on the machine table through a movable supporting base; the necking rotary disc is rotationally matched with the supporting base; the necking rotary disc comprises a disc-type base, a plurality of necking pipes arranged on the outer circumference of the base and a rotatable rotating knife assembly; and a necking mould penetrating through the outer end of a necking head part is arranged at the head part of the necking pipe.

The invention discloses a preparation device of beancurd skin sausage. The preparation device of the beancurd skin sausage comprises a workbench, a hopper arranged on the workbench and guide pipes running through the workbench and communicated with the hopper, wherein a stirrer is arranged in the hopper and the rotating direction of the stirrer is vertical to the material guide pipe; the lower part of the workbench is connected with a rotating disk rotating along with the stirrer; an even number of the guide pipes are connected with the rotating disk uniformly in pairs; the distance between every two guide pipes in one group is less than the length of the beancurd skin sausage; the underface of the rotating disk is detachably connected with a guide disk rotating along with the rotating disk; and guide holes for casing to pass through are formed in the guide disk and are in one-to-one correspondence with the material guide pipes above the guide disk. The beancurd skin sausage products prepared by the device have high consistency.

The invention discloses a mechanical arm capable of automatically being closed, and belongs to the technical field of mechanical arms. The mechanical arm comprises a fixing rod, a mechanical gripper and one-way door structures; the one-way door structures comprise sliding blocks, springs and elastic blocks; an upper half body is fixedly connected with the fixing rod, the top of a bending part is fixedly connected with the upper half body, and the bottom of the bending part is fixedly connected with a lower half body; a plurality of long holes are formed in the lower half body at equal intervals, and the lower half body is divided by the long holes into a plurality of grid blocks, the one-way door structures are arranged on the grid blocks, grooves are formed in one ends, far away from the bending part, of the grid blocks, the springs and the elastic blocks are arranged in the grooves, the spring is arranged at the tops of the elastic blocks, the tops of the elastic blocks are closely clamped in the grooves, and the bottoms of the elastic blocks are fixedly connected with the sliding blocks. The mechanical arm is simple in structure, the production manufacturing procedure is small during large-scale outputting, and cost is greatly reduced; human labor can be replaced, the production cost is reduced, it can be avoided that parts fall off in the process that the parts are grabbed, and it is guaranteed that the parts can stably enter the following procedure.

The invention relates to a waste removal device of an unwinding type die-cutting machine. The waste removal device comprises a waste half-removal mechanism, a waste full-removal mechanism and a paperand scrap edge drive mechanism. The waste half-removal mechanism comprises an upper waste half-removal die plate and a lower waste half-removal die plate; the upper waste half-removal die plate is connected with a waste half-removal cam drive unit and moves up and down; the lower waste half-removal die plate is stationary; and a scrap edge collection unit is arranged on the lower portion of the waste half-removal mechanism. The waste full-removal mechanism comprises an upper waste full-removal die plate and a lower waste full-removal die plate; the upper waste full-removal die plate is connected with a waste full-removal cam drive unit and moves up and down; the lower waste full-removal die plate is stationary; and an automatic stacking and lifting unit for collecting finished products isarranged on the lower portion of the waste full-removal mechanism. The paper and scrap edge drive mechanism comprises a drive roller and a plurality of driven rollers, and the drive roller and the driven rollers are used for clamping the products therebetween. By means of the waste removal device, scrap edges, generated after die-cutting, of the products can be effectively removed, the manual waste removal operation is omitted, the number of production and processing procedures is reduced, product transfer is accelerated, the products are fully stripped off and automatically stacked, the production efficiency is high, and the waste removal device shows the energy-saving, cost-saving and environment-friendly concepts.

The invention relates to an IGBT (Insulated Gate Bipolar Translator) inversion non-gas-shielded welding machine. The voltage of the power source of the welding machine ranges from 110 to 120 V; and the frequency of the power source of the welding machine ranges from 50 to 60 Hz. The interior of the welding machine is divided into an upper layer and a lower layer through a middle partition plate. The upper layer is mainly provided with a wire feeder, a welding wire reel shaft and a front control panel. The lower layer is mainly provided with a power control panel, an output filter reactor, a cooling fan and the like. The control circuit boards of the welding machine include a front control board and a power control board. A control circuit comprises a power-on buffering, voltage doubling, rectifying and filtering circuit, an IGBT driving, inversion, output rectifying and filtering circuit, a switching power supply circuit, an indication, voltage and current (or wire feeding speed) setting and wire feeding control circuit, and an output characteristic and protection (such as overcurrent, overvoltage, undervoltage and overheating protection) control part. The structure schematic diagram of an exemplary welding machine and the circuit schematic diagram of each part of the welding machine are provided; and the structure schematic diagram and the circuit schematic diagrams are correspondingly explained. According to the welding machine, a non-gas-shielded flux-cored wire is adopted, so that protective gas is not needed; semi-automatic welding can be realized; and the control circuit is simple and reasonable in design, high in working reliability and low in product manufacturing cost.