Laser soldering device and welding method

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a laser soldering device and a welding method. Background technique [0002] Laser soldering is a soldering method that uses laser as a heat source. Compared with the traditional soldering process, laser soldering has the advantages of fast heating speed, small heat input and thermal influence, precise control of welding position, and automatic welding process. Significantly reduce the impact of volatiles in the brazing process on the operator; non-contact heating: suitable for welding complex structural parts and other advantages. [0003] Laser soldering takes the laser heat source as the main body, and fills and melts the tin material to achieve the process effects of connection, conduction and reinforcement. According to the state of tin material, it can be summarized into three main forms: tin wire filling, solder paste filling, tin ball filling, and there are corresp...

AI Technical Summary

Problems solved by technology

However, compared with traditional soldering iron soldering, the work efficiency improvement of wire feeding soldering is small, so the application of laser soldering is very limited

[0004] Solder paste filled laser welding is to pre-apply solder paste with the aid of a dispenser, and then heat and melt it with the laser and wet it with the PCB board to achieve welding; however, the high concentration of laser energy in this method can easily lead to uneven heating of the solder paste, bursting and splashing. Spilled tin beads cause a short circuit

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