XU Y L, QIAN P, LI J Y, et al.Study on microstructure and mechanical properties of TIG welded joint of dissimilar steel 304&Q235[J].Electric Welding Machine, 2022, 52(01): 54-62.
XU Y L, QIAN P, LI J Y, et al.Study on microstructure and mechanical properties of TIG welded joint of dissimilar steel 304&Q235[J].Electric Welding Machine, 2022, 52(01): 54-62. DOI: 10.7512/j.issn.1001-2303.2022.01.07.
Study on Microstructure and Mechanical Properties of TIG Welded Joint of Dissimilar Steel 304&Q235
In order to give full play to their respective advantages, the combined application of dissimilar steel materials came into being, in this study, the dissimilar steel welding experiments of Q235 carbon steel and 304 austenitic stainless steel were carried out by TIG welding, and the welding process was optimized by controlling variables to obtain the qualified welding joints. The microstructure evolution of the welded joint was observed by metallographic microscope and scanning electron microscope and the analysis of phases in the weld seam were tested by X-ray diffractometer. The tensile properties and microhardness of the welded specimens were tested by universal tensile testing machine and microhardness tester respectively. The results show that the weld zone is composed of lath martensite; Carbon migration occurs obviously at Q235 interface, decarburization layer appears on one side of Q235 and carburization layer appears on one side of weld; The microstructure of 304 side fusion zone is fine and discontinuous vermicular ferrite distributed in austenite matrix. When the welded joint is fully penetrated, the tensile fracture occurs on the side of Q235 steel, which indicates that the strength of the welded joint is higher than that of the base metal, and presenting ductile fracture; The distribution rule of microhardness in each area of welded joint is as follows: weld zone > 304 heat affected zone > 304 base metal > Q235 heat affected zone > Q235 base metal.
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