33results about How to "Strong solder joints" patented technology

The invention discloses a lead welding technique for packaging a semiconductor power device and belongs to the technical field of semiconductor power device packaging and manufacturing. According to the technique, lead connection is achieved through a brazing technique, and the brazing process is achieved through lasers, wherein lead connection refers to the completion of the welding process of a lead and a chip and the welding process of the lead and two welding points of a frame. In the welding process, the lead, the frame and a chip welding pad are preheated through direct laser spot radiation, the diameter of laser spots is 1 mm, and laser radiation time is 10 ms; and a brazing wire is heated through direct laser spot radiation, the diameter of the laser spots is 1 mm, and laser radiation time is 10 ms. By the adoption of the technique, the wet aluminum pad and the frame can be melted directly to achieve stable and reliable connection of the lead, the chip and the frame, the aluminum pad and the frame cannot be melted due to the fact that the temperature does not reach the melting point, and the aluminum pad and the frame are just preheated, so that the surfaces are stretched fully to assist in combination of the aluminum pad and liquid brazing filler metal and combination of the frame and the liquid brazing filler metal, and therefore mechanical damage, thermal damage and the stress problem existing in a traditional routing technique are avoided.

The invention discloses lead welding brazing filler metal for packaging of a semiconductor power device and a preparation method and application thereof, and belongs to the technical field of packaging and manufacturing of semiconductor power devices. The brazing filler metal is brazing filler metal for a copper or aluminum lead; the brazing filler metal for the copper lead (wt.%) comprises 20-29% of Cu, 10.0-20.0% of Al, 2.0-11.0% of Ag, 2.0-5.0% of Bi, 3.0-9.0% of Sb, 3.0-9.0% of In and the balance of Sn; and the brazing filler metal for the aluminum lead (wt.%) comprises 21.0-29.0% of Cu, 18.0-27% of Al, 2.0-9.0% of Ag, 2.0-3.5% of Bi, 6.0-8.0% of Sb, 6.0-8.0% of In and the balance of Sn. In a lead welding process of the brazing filler metal for packaging of the semiconductor power device, the welding temperature is 280-320 DEG C to directly melt and moisten an aluminum pad and a frame to realize stable and reliable connection among the three.

The invention discloses soldering paste special for aluminum material soldering and a preparation method and a using method thereof. The soldering paste is prepared from, by weight, 84-89% of solder powder, 8-12% of scaling powder and 2-5% of a dispersing agent. The solder powder is prepared from, by weight, 3.2-4.8% of Zn, 1.6-2.4% of Bi, 0.7-1.3% of In, 0.4-0.8% of Ga, 0.2-0.5% of Sb, 0.1-0.3% of Ru and the balance Sn. The scaling powder is prepared from, by weight, 40-50% of a main material, 20-35% of a solvent, 8-16% of an activating agent, 4-8% of a thixotropic agent, 2-4% of a surfactantand 1-3% of antioxidant. The soldering paste has excellent tin soldering performance, welding spots are full, bright and firm, and lead is not used, so that safety and environment protection are achieved.

The invention discloses a manufacturing method of a reinforcement cage, which includes a welding mechanism for winding and welding the reinforcement around the reinforcement, a feeding mechanism for feeding the main reinforcement, a central rotating assembly for rotating the inner ring, and a center rotating assembly for fixing the inner ring. The fixed inner ring assembly also includes a detection mechanism for detecting and positioning the length of the main reinforcement, and a main reinforcement welding mechanism for welding the main reinforcement. From the loading, welding and unloading of the steel cage, the present invention realizes automatic processing, and the solder joints of the steel cage are stable, so that the welding quality of the steel cage is stable, reducing manpower input and labor intensity of workers, and greatly improving the quality of steel bars. Cage production efficiency, and can produce steel cages of different specifications.

The invention discloses an electric connector and a wire connecting method thereof. The connecting method comprises the step of connecting socket wires or plug wires and comprises the following concrete steps: strengthening the end parts of wires; welding and protecting each wire after the end parts of the wires are welded with a socket or a plug; and protecting the integrated wires connected with the socket or the plug. The electric connector comprises a socket, a plug, a first wire cable and a second wire cable, wherein the first wire cable and the second wire cable are respectively connected with the plug or the socket; metal terminals are fixed at the end parts of the wires and are welded together with pins on the plug or the socket; a small thermal shrinkable sleeve is sleeved at the welding part of the wires; a big thermal shrinkable sleeve is sleeved outside the second wire cable; and the sheath of the first wire cable is clamped by a tail clamp of the plug. The connecting method of the invention can enhance the connecting strength, can enhance the tensile resistance and the torsion resistance, and completely can ensure the reliability requirement of a reinforced computer. The electric connector of the invention has high connecting strength, tensile resistance and torsion resistance, and the wires can not be broken easily.

The present invention relates to a fixture for welding the movable platform of a climbing car, which comprises a rectangular parallelepiped frame-shaped support, and a bearing fixing frame is fixedly installed on the middle part of the top surface of the top side beam of the support, and the top side beam is opposite to the A bearing fixing frame is also symmetrically installed on the other side of the top side beam, and each of the two bearing fixing frames is fixed with a rotating shaft parallel to the top surface of the bracket, and a plate is set on the two rotating shafts. Shaped fixed block, the fixed block is parallel to the top surface of the bracket, the central axis of the fixed block is parallel to the axis of the rotating shaft, the fixed block is also provided with a splint frame, and the splint frame is composed of several cross bars and several The vertical bar is composed of two vertical bars, the vertical bar is parallel to the axis of the rotating shaft, the horizontal bar is perpendicular to the vertical plane where the axis of the rotating shaft is located, the width of the horizontal bar is greater than the width of the fixed block, and the two ends of the horizontal bar are The position places are formed with the connecting rod of 凵 font respectively.

The invention provides a laser tin soldering device and a soldering method. The laser tin soldering device comprises a clamp used for clamping a to-be-soldered workpiece, a laser device, a collimation head connected to the laser device, a charge coupled device (CCD) adjusting microscope base and a focusing head. One end of the collimation head is connected to the laser device through an optical fiber, and the other end of the collimation head is connected to the CCD adjusting microscope base; a CCD lens is disposed at the top end of the CCD adjusting microscope base; the bottom end of the CCD adjusting microscope base is connected to the focusing head; a hot air blowing assembly capable of performing relative rotation is connected to the CCD adjusting microscope base. By means of the laser tin soldering device and the soldering method, large-area heat can be provided, and splashing due to non-uniform heating of tin paste during soldering is effectively avoided; meanwhile, hot air flow can accelerate the flowing of liquid tin, so that the working efficiency and stability of soldering are improved; volatilization of scaling powder can be accelerated, so that solder points are firmer and more attractive.

The invention discloses a spot welding machine control system, comprising an EMI filtering circuit, a voltage transformation rectifying filtering voltage stabilizing circuit, a synchronous circuit, a CUP program control circuit, a starting circuit, a drive circuit, a separately excited switching power supply circuit, and a pulse generation and output circuit. The IN1 and IN2 of the EMI filtering circuit access AC380V voltage, and through a filter LL6, the voltage is output to a control transformer through an OUT1 and an OUT2. Through the voltage transformation rectifying filtering voltage stabilizing circuit, the voltage is transformed to AC28V and AC9V, and through rectification, filtering, and voltage stabilization, DC5V and DC24V are output to an operating circuit to supply power. The system is advantaged by simple structure, complete functions, and convenient adjustment. Net voltage automatic compensation and high anti-interference functions make the controller can reliably and stably operate in environment of unstable power grid voltage and high-strength electromagnetic interference. A current slowly-rising function effectively restricts welding spark from splattering, and welding spots are firmer.

The invention discloses an air conditioner liquid storage device welding protection device and an application method thereof, and belongs to the technical field of welding. The air conditioner liquid storage device welding protection device comprises an outer ventilation block and an inner ventilation block. The outer ventilation block is of a rectangular block-shaped structure and is provided with a transverse air blowing hole and longitudinal air blowing holes and connected with an air source through an outer ventilation connecting hole. An inner air blowing hole is formed in the inner ventilation block and connected with the air source through an inner ventilation connecting hole. According to the method, a cylinder is inflated with protection air through the inner ventilation block in the welding process, the welding position is immediately inflated with the protection air through the outer ventilation block after welding is finished, and air is prevented from making contact with a welding line. By means of the air conditioner liquid storage device welding protection device and the application method thereof, the surface of a welded part can be prevented from being oxidized during liquid storage device welding, the connecting strength of the welding line is improved, the quality of a finished product is improved, and the production cost is reduced.

The invention relates to a power capacitor with good heat dissipation performance, which includes a cover plate assembly, a casing and a capacitor core group. The capacitor core group is formed by superimposing several cylindrical capacitor cores, and the lead-out copper strip is arranged on the gold-sprayed surface of the capacitor core group. , the coverage area on both sides of the lead-out copper strip extends at least to the central area of ​​the gold-sprayed surface of the capacitor core located on both sides of the capacitor core group, and the lead-out copper strip has a through hole or an opening in the center of the gold-sprayed surface of each capacitor core A groove on one side of the lead-out copper strip has elastic fins extending into the through hole or groove for electrical connection with the gold-sprayed surface by welding. By enlarging the width of the lead-out copper strip, the current can pass through evenly and the calorific value can be reduced. Moreover, the area of ​​the lead-out copper strip is also doubled, and the heat dissipation performance is significantly enhanced.