Because of its advantages

such as optimizing arc energy distribution

stirring the welding pool and easily regulating chemical composition

a new multi-stranded wire was employed to join in the welding of high nitrogen stainless steel structures and significantly reduced the porosity in the weld

and the precipitation of second phases in the weld was suppressed

the microstructure of the heat affected zone improved with relatively low heat input. The microstructure and mechanical properties were improved by analysing and optimizing the GMAW joints of high nitrogen stainless steel

meeting the engineering technical requirements of important welded structural parts.