Influence of Filler Metal and Current on Microstructure and Properties of 0Cr18Ni9/Q235 Dissimilar Welded Joints
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摘要: 采用TIG焊接工艺，分别选用直径为2.0 mm的ER309、Ni317焊丝及90~120 A电流，对0Cr18Ni9奥氏体不锈钢和Q235碳钢进行双面焊，研究了焊接接头的金相组织、拉伸性能和显微硬度。结果表明：同种焊丝，在90~120 A焊接电流条件下，随着电流增大，抗拉强度增大，拉伸断口均出现韧窝，为韧性断裂；采用ER309焊丝的接头拉伸性能要优于Ni317焊丝接头；两种焊丝焊接，电流值都为110 A时接头硬度最佳。Abstract: The Tungsten Inert Gas(TIG) welding process was used to weld 0Cr18Ni9 austenitic stainless steel and Q235 carbon steel with ER309 and Ni317 wires of 2.0 mm in diameter.The microstructure,tensile properties and micro-hardness of the welded joint were studied.The results show that when the applied welding current ranges from 90 A to 120 A,the tensile strength increases with the increase of welding current,and dimples appear on the tensile fracture surface,which is typical of tough fracture.The tensile properties of the joints with ER309 welding wire are better than those with Ni317 welding wire.For both of welding wires,maximum hardness of the joints achieves at the 110 A of applied current.
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Key words:
- stainless steel /
- dissimilar welding /
- hardness /
- morphology
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