Study on CMT Welding of Stainless Steel Railway Vehicle Body

Abstract

Abstract. Cold metal transfer (CMT) process is a modified inert gas metal welding process,which characterizes of low heat input and no spatter welding comparing with traditional GMAW process.In this paper,research of the CMT welding features of stainless steel sheet has been conducted.The effects of welding parameters including wire feed rate,welding speed and arc-length modification coefficient on mechanical properties and surface morphology were investigated.In addition,optical micrograph(OM) and scanning electron microscope(SEM) were used to analyze the weld microstructure,and microstructural characteristics were discussed as well.In the end,the optimum welding parameters which were used in real production and achieved good effect were obtained by means of orthogonal experiment.