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A 5 mm thick DL510 ultra-high strength steel (1 500 MPa) was welded by using metal active gas (MAG) arc welding. The influence of heat input on the microstructure and mechanical properties of weld joint was investigated, and the residual weld stress of the joint was eliminated by hammering while welding. The results show that with heat input within the range of 43-70 kJ/cm, the obtained weld joints can have a good shape. If hammering time is less than 20 min, the tensile strength of weld joint increases as hammering time prolongs; however, after hammering time exceeds 20 min, there is little variation in the tensile strength. With the increasing of heat input, the grain size of weld joints grows obviously, and a small amount of fine granular bainite structure appears in the coarse-grained area with the heat input of 70 kJ/cm, leading to improvement in the toughness of weld joints.

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采用熔化极活性气体保护电弧焊（MAG焊）焊接5 mm厚的DL510超高强钢（1 500 MPa级），研究了热输入量对焊接接头组织及力学性能的影响，并采用边焊边锤击的方式消除焊接接头残余应力。结果表明，热输入在43~70 kJ/cm范围内，均能获得成型良好的焊接接头；锤击时间低于20 min时，随着锤击时间延长，接头抗拉强度不断提升，但锤击时间超过20 min后，焊接接头抗拉强度变化不大；随着热输入增加，焊接接头晶粒明显长大；热输入为70 kJ/cm时，粗晶区出现少量细小粒状贝氏体组织，焊接接头韧性得到改善。

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李扬（1985—），女，河北石家庄人，博士，副教授，主要研究方向为焊接工艺及结构、模具设计与制造。

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李扬（1985—），女，河北石家庄人，博士，副教授，主要研究方向为焊接工艺及结构、模具设计与制造。

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