Precise laser welding of austenitic stainless steel
(Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621900, China)
Abstract: The welding parameters and quality of 0Cr18Ni9 austenitic stainless steel via laser penetrate welding were investigated, which was aimed to realize its precise laser welding with weld depth more than 2.5mm and weld deformation as small as possible. The welding parameters mainly include energy parameters (laser power and welding velocity), light factors (focus offset, beam offset and method to focus) and environment factors (type and flux of protecting gas). The test results demonstrate that the energy parameters have crucial effect on weld depth, which nearly increase linearly with the increase of laser power or the decrease of weld velocity, the light factors have certain effect on the wed depth, specially, which decreases obviously when beam offset exceeds 0.45mm. The tempe- rature increment at the position of 5mm away from weld centerline is less than 100℃ and the weld deformation is the axial shrinkage with depth less than 0.1mm.
Key words: precise laser welding； weld deformation； temperature rise