焊接工艺对TP304钢焊缝金属组织及性能的影响

针对TP304不锈钢,采用三种不同的焊接工艺方法,选取合适的焊接工艺参数,成功制备三组完整的焊接接头.通过X荧光化学成分分析、显微组织观察和显微硬度试验研究了不同焊接方法对TP304不锈钢焊缝金属组织和性能的影响.结果表明,不同焊接方法下焊缝合金成分有所差异,且分布不均;各焊层显微组织形态和晶粒大小差异较大;整个接头的硬度值分布并不均匀,焊缝高于热影响区,热影响区高于母材.三种焊接方法相比,TIG-MAG焊缝的硬度值最大,TIG-SMAW的最小.对于薄板不锈钢焊接,TIG-MAG组合焊法优选.

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 TIG-SMAW process is minimum by comparing three methods.TIG-MAG welding method is better for the thin stainless steel.