摘要
Abstract
Welding experiments were conducted on 80 mm thick plates of 316LN austenitic stainless steel using manual gas tungsten arc welding(GTAW)and vacuum electron beam welding(EBW).A systematic comparative analysis was conducted to evaluate effects of two welding methods on the comprehensive properties of weld joints,including macroscopic formation,microstructure,tensile strength,bending performance,and impact toughness,based on mechanical property testing and microstructural analysis.Research results indicate that both welding methods can produce qualified welds free of macroscopic defects or detrimental phrases.The tensile strength of the GTAW joint(575 MPa)is slightly higher than that of the EBW joint(551 MPa),and fracture occurred in the base metal,indicating a strength mismatch between the weld and the base metal.However,the tensile strength of the EBW joint is slightly lower,and fracture occurred at the weld seam.The average impact energy of the weld seam and the heat-affected zone in EBW(333.4 J and 354.6 J)was significantly higher than that in GTAW(153 J and 218 J).Furthermore,the EBW joint exhibits consistent bending performance,with no surface-breaking defects observed.In summary,for the 316LN thick-plate subjected to high-impact loading conditions,EBW demonstrate advantages.If static strength is the primary consideration,GTAW remains a viable alternative that satisfies performance requirements..关键词
316LN不锈钢/厚板焊接/手工氩弧焊/真空电子束焊/力学性能/微观组织Key words
316LN stainless steel/thick plate welding/manual gas tungsten arc welding(GTAW)/vacuum electron beam welding(EBW)/mechanical properties/microstructure分类
矿业与冶金
