Low-alloy high-strength steel Q460 thick plates were welded by CO2 gas shielded arc welding with solid wire and flux-cored wire at different heat inputs (12.6, 16.4, 19.5 kJ·cm-1). The effects of welding wire and heat input on the microstructure and tensile properties of the joint were investigated. The results show that the proportion of acicular ferrite in columnar grain zone in weld zone of the two joints decreased and the grain boundary ferrite of large size increased with the increase of heat input. The hardness of weld zone of the joint welded with solid wire changed little with the increase of heat input,but that of the joint welded with flux-cored wire decreased significantly. The yield strength and ultimate tensile strength of the joint welded with solid wire were similar to those of base metal whereas the elongation was lower than that of base metal; the elongation decreased with the increase of heat input. The strenth of the joint welded with flux-cored wire was equivalent to that of the base metal at lower heat input. The increase of heat input obviously reduced the tensile strength, but affected the yield strength and elongation slightly.
引用該論文:FENG Xiangli,WANG Lei,LIU Yang. Effect of Welding Material and Heat Input on Tensile Property of Welded Joint of Q460 Steel Thick Plate[J]. Materials for mechancial engineering, 2019, 43(3): 1～6 馮祥利,王磊,劉楊. 焊接材料及熱輸入對Q460鋼厚板焊接接頭拉伸性能的影響[J]. 機械工程材料, 2019, 43(3): 1～6
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