Analysis and application of working principle of laser tin welder and laser welding machine

Analysis and application of working principle of laser tin welder and laser welding machine

Is laser soldering machine (laser soft soldering machine) the same as laser welding machine? Why are the names so similar? Are they the same laser device? Is it universal? Of course not, laser welding machine and laser soldering machine is just the name of the similar, from the working principle, applicable materials and application industry, these several aspects are not too much contact, they are two completely independent equipment!

1. Working principle:

Laser welding is the use of high energy density of laser beam as a precision welding heat source method, divided into heat conductivity welding and deep penetration laser welding, the workpiece surface heat to the internal diffusion through heat conduction, by controlling the width of laser pulse, energy, peak power and repeating frequency parameters, such as melt artifacts, form specific molten pool, Is one of the important aspects of laser material processing and application, mainly for the welding of thin-wall materials and precision parts, can achieve spot welding, butt welding, overlapping welding, sealing welding, etc.

The main characteristic of laser tin welding is to use the high energy density of laser to achieve the process of local or small area heating to complete tin welding. The key of laser soldering is to control laser power distribution reasonably. Although both use laser beam as a heat source, but there are still differences in the process.

Laser soldering (laser soft brazing) is a kind of laser processing. It was based on the laser as a heating source, the radiation heating wire (or leadless device connection pad), by laser soldering dedicated solder (laser solder paste/solder wire or prefabricated solder pieces) to the base plate heat transfer, when the temperature reaches the liquidus temperature of tin solder, the solder melts, base plate, lead solder wetting, forming a solder joint.

2. Applicable materials and application fields:

The materials used by laser soldering machine are SMT plug-in, temperature sensitive component welding, difficult to weld components, micro loudspeaker/motor, all kinds of PCB after SMT welding processing, mobile phone parts and so on. Laser tin welding machine is mainly used in the electronic industry precision processing such as PCB board connection plate, FPC, electronic connector, thermal components and other spot welding, but also suitable for the field of microelectronics, such as extremely fine coaxial line and terminal welding, USB line welding, soft CIRCUIT board FPC or hard CIRCUIT PCB welding, high precision LCD, TFT welding and high frequency transmission lines and other aspects.

Laser welding machine for welding materials are die steel, carbon steel, alloy steel, stainless steel, copper and copper alloy, aluminum and aluminum alloy, plastic and so on. Laser welding machine is widely used in battery, solar energy, mobile communication, optical fiber communicator, mold, electronic appliances, IC integrated appliances, instruments and meters, gold and silver jewelry, precision devices, aerospace devices, automotive industry, motor industry.