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 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 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 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.