Due to the continuous development of electronic components to miniaturization, the requirements of small weld joints, high welding strength, small heat-affected zone around the processing point. Conventional welding technology is difficult to meet these requirements because of the poor appearance of the weld seam, low efficiency of the welding operation, poor bonding of the weld seam annulus to the weld part annulus, and the tendency to cause ‘’desoldering’’ and so on.

The laser can produce a true fusion, so that the contact of the various aspects of the material melting and mixing. Laser soldering machine is the use of laser action on the electronic components and circuit boards connected to the surface of the pad, the laser energy heated tin instantaneous melting and the formation of rounded and full of solder joints of a laser welding process. Laser welding robot to the semiconductor laser as the welding heat source, making it has been increasingly widely used in cell phones, laptops and other electronic equipment, camera parts welding. Semiconductor lasers (also known as laser diodes (LD)) are used as the welding heat source for laser welding robots, making miniaturized, high-performance laser welding robot systems a reality. 

Working Principle of Laser Welding Robot

Semiconductor laser soldering robot system is equipped with a position correction system to ensure the precise position of the welding point and the optimization of process parameters. Its principle is through the camera on the workpiece, the marking point on the irradiation, through the high-performance image processing device and laser displacement sensor, the welding position and height of the complementary correction. Process parameters such as output power, laser irradiation time and welding temperature profile are set via the LCD touch screen. The laser head is equipped with an anti-smoke optical lens and a protection system, so that the protective glass at the front of the lens can be replaced during maintenance. The laser beam suitable for the spot diameter can be selected by the compact and powerful laser generator in the system. The laser power is up to 30W and 50W (air-cooled) and is continuously adjustable to achieve the optimum power for welding.

Laser welding robot features

1, with non-contact, laser formed point diameter can be as small as 0. 1mm, tin delivery device can be as small as 0.2mm, can realize the welding of micro-pitch package (mounting) components.

2, because it is a short period of local heating, the thermal impact on the substrate and the surrounding parts is very small, good quality solder joints.

3, no soldering iron tip consumption, no need to replace the heater, continuous operation, has a high working efficiency.

4, for lead-free soldering, not easy to crack the solder joints.

5, the surface temperature of the solder with non-contact measurement, and can not use the actual contact with the temperature measurement method of the welding head.

Application of laser welding robot

Laser welding robot system has been more and more widely used in cell phones, notebook computers and other electronic equipment, camera parts, LCD parts and micro-motor, micro-transformer and other parts of the welding, but also for LCD TV, high-end digital cameras, aerospace and military manufacturing, high-end automotive parts manufacturing and other fields.