Authors: Caiwang Tan Xiaoguo Song Shenghao Meng Bo Chen Liqun Li Jicai Feng
Publish Date: 2015/12/07
Volume: 86, Issue: 1-4, Pages: 203-213
Abstract
Magnesium alloy and stainless steel were joined by dualbeam laser weldingbrazing process The effect of the main process parameters including welding speed wire feed speed and heat input on weld appearance of the dissimilar joint was investigated The microstructures of both welded and brazed side were observed using scanning electron microscopy SEM and identified by transmission electron microscopy TEM Mechanical properties were then studied Formation of continuous thin reaction layer was observed along the fusion zonesteel interface which was thereafter identified as FeAl intermetallic compound The thickness was in the range of 09–29 μm varied slowly with the increase of heat input The tensileshear test indicated that high joint strength was achieved at a wide range of heat input with a maximum value of 2745 N/mm reaching 838 of that of Mg base metal The corresponding failure occurred in the heataffected zone HAZ of the Mg base metal While joints fractured at the interface or fusion zone at low/high heat input due to weak bonding or porosity formation at fusion zone
Keywords: