焊接工艺对不锈钢角焊缝连接试件力学性能影响研究

对12个奥氏体型及12个双相型不锈钢正面角焊缝和侧面角焊缝连接试件进行了单调拉伸试验，考察了不同焊接工艺对角焊缝连接力学性能的影响。结果表明:采用氩弧焊焊接工艺的不锈钢角焊缝试件破坏面与电弧焊焊接工艺的试件破坏面形状相差较大，后者破坏面更加光滑；同时由于受到复杂应力的作用，正面角焊缝试件的真实破坏角度并不为相关规范规定的理论值45°；对于奥氏体型不锈钢角焊缝，氩弧焊试件与电弧焊试件的强度比分别为1.03 (正面角焊缝试件)及1.13 (侧面角焊缝试件)，相对变形量之比为1.46及1.11；而对于双相型不锈钢角焊缝，两者的强度比分别为1.12和1.04，相对变形量之比为1.66及1.45；氩弧焊试件表现出了更好的力学性能。对于两种不锈钢材料，正面角焊缝强度均远大于侧面角焊缝的强度，建议在工程设计和相关规范的编制/修订中考虑正面角焊缝强度提高的影响。

INVESTIGATION ON THE INFLUENCE OF WELDING PROCESSESON MECHANICAL PROPERTIES OF STAINLESS STEELFILLET WELD CONNECTIONS

In order to study the effect of different welding processes on mechanical properties of stainless steel fillet weld connections,the monotonic tensile tests of 12 austenitic and 12 duplex stainless steel specimens were carried out.The results show that the failure surface of specimens made by TIG(Tungsten Inert Gas Welding)is quite different from that of specimens made by SMAW(Shielded Metal Arc Welding),and the latter is much smoother.Besides,the true failure angle of the transverse fillet weld connections is not the theoretical value of 45°due to the influence of the complex stress.For austenitic stainless steel,the strength ratios of specimens made by TIG to SMAW are 1.03(for transverse fillet weld connections)and 1.13(for longitudinal fillet weld connections),and the ratios of relative deformation are 1.46 and 1.11.For duplex stainless steel,the strength ratios are 1.12 and 1.04,meanwhile the relative deformation ratios are 1.66 and 1.45.The connections made by TIG show better mechanical properties.For the two stainless steel,the strengths of transverse fillet weld connections are much better than those of the longitudinal fillet weld connections,so it is suggested that the influence of the increase of the strength of transverse fillet weld connections be taken into account in the compilation or revision of the related specifications.