Study of microstructure and properties in weld metal of TP304 steel under three processes

Using three different welding processes,the appropriate welding process parameters were selected and three groups welded joints of TP304 stainless steel were prepared successfully.The microstructure and properties in weld metal zone of TP304 stainless steel under different welding methods were studied by X-fluorescent chemical composition analysis,microstructure observations and micro-hardness test.The results show that alloy composition of weld metal are different and distribute uniformly with different welding methods,microstructure morphology and grain size of the solder layer are quite different.Hardness of the joint is not evenly distribute,weld metal is higher than HAZ,and HAZ is higher than the base metal.Hardness of the weld under TIG-MAG process is maximum and TIGSMAW process is minimum by comparing three methods.TIGMAG welding method is better for the thin stainless steel.