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对公路钢桥复合钢板进行了电弧焊和钨极氩弧焊,考察了3种焊接接头的力学性能和焊接接头区域的显微组织变化,对热影响区中的铁素体含量和奥氏体含量进行了表征。结果表明,3种焊接接头中,焊接接头B具有最佳的强度和塑性结合,且焊接接头A和焊接接头B的抗拉强度要高于焊接接头C,即采用电弧焊工艺得到的焊接接头的性能要优于电弧焊+钨极氩弧焊焊接接头。2205钢与过渡层焊接接头A和焊接接头B中的热影响区宽度较为接近,且都小于焊接接头C中的热影响区宽度。16Mn钢与过渡层焊缝界面的脱碳层宽度从大至小依次为:焊接接头A>焊接接头B>焊接接头C。
The highway steel bridge composite steel was arc welding and TIG welding. The mechanical properties of the three kinds of welded joints and the microstructure changes of welded joints were investigated. The effects of ferrite content and austenite Content was characterized. The results show that among the three kinds of welded joints, the welded joint B has the best combination of strength and plasticity, and the tensile strength of the welded joint A and the welded joint B is higher than that of the welded joint C, that is, the welded joint obtained by the arc welding process Performance is better than the arc welding + TIG welding joints. The width of the heat-affected zone in 2205 steel and transitional weld A and B is relatively close and less than the width of the HAZ in weld C, respectively. The width of the decarburized layer at the weld interface of 16Mn steel and transitional layer is as follows: welded joint A> welded joint B> welded joint C.