Explanation

Weld method using focused laser beam as heat source, power density can reach 10 ^ 5W/cm 2 Above. According to the energy output mode, it can be divided into continuous laser welding and pulse laser welding. According to the process characteristics formed by different power density acting on the workpiece, it can be divided into deep penetration weld (power density is greater than 10 ^ 6W/cm 2） And heat conduction weld (power density is less than 10 ^ 6W/cm 2）。 The laser used for weld mainly includes CO2 laser (wavelength 10.6 μ m) And YAG (neodymium doped yttrium aluminum garnet) laser (wavelength 1.06 μ m) . laser welding has the characteristics of high power density, deep and narrow weld, small heat affected zone, fast speed and high quality. It is suitable for weld between refractory metals and workpieces with different thermophysical properties. It is also widely used in auto sheet welding, microelectronic circuit packaging weld, etc. YAG laser can be combined with optical fiber transmission robot to form a flexible laser weld system. Laser arc hybrid welding is the weld with laser and arc as the heat source, which is used to improve the laser absorption of the base metal, increase the penetration and stabilize the arc.

Classification