Laser soft brazing is a laser welding technology in which the semiconductor laser is used as heat source and the solder paste used for laser soft brazing is heated. The laser is used as heat source, radiating lead wire and solder plate, and the heat is transferred to the base plate through the solder. When the temperature reaches the temperature of soft brazing, the solder is wetted and spread to form the solder joint.Due to the advantages of adjustable spot area, small influence of hot area, quick heating and cooling, etc., it is widely used in the welding procedure of automobile electronics industry, semiconductor industry and mobile phone consumer electronics industry, such as optical communication, camera module, automobile electronics, FPC soft board, connector terminal and other products.

Laser soft soldering compared with traditional iron soldering process automation, soft laser brazing has irreplaceable advantages: first, the principle of heating and automatic soldering iron, soldering iron automatic soldering on "heat transfer" slow heating, belong to "surface exothermic" type of contact welding, laser soft brazing heating speed, using a laser high-energy realize local or small areas of rapid heating, for non-contact welding.