Nd:YAG Laser Welding of Magnesium Alloy Castings

摘要

A CW 4 kW Nd:YAG laser system was used to weld 2-3 mm butt joints of sand-cast ZE41A-T5 magnesium alloy at a power of 2.5 or 3.5 kW, welding speed of 6.0 m/min and defocusing distance from 0 to +3 mm for the material on the as-cast surface conditions. Sound joints with good surface quality, minor pores and micro cracks can be obtained using strictly controlled laser welding parameters.