Q345E钢薄板小变形焊接工艺

Q345E钢薄板小变形焊接工艺 Small deformation welding process of Q345E steel sheet 吴宪 WU Xian 1 first-author 丁成钢 DING Chenggang 1 大连交通大学材料科学与工程学院 大连交通大学材料科学与工程学院 School of Materials Science and Engineering,Dalian University of Technology School of Materials Science and Engineering,Dalian University of Technology 分别采用高频脉冲MAG焊的打底焊模式与电弧冷焊模式对板厚3 mm的Q345E薄板进行了3种工况的对接焊工艺试验,研究了薄板打底焊与电弧冷焊的小变形对接焊工艺与焊接接头的力学性能,进行了拉伸、弯曲、金相试验并分析了焊接缺陷的形成原因,总结了焊接残余应力及焊接变形的规律。结果表明,高频脉冲MAG焊适用于Q345E钢3 mm的薄板小变形对接焊,组对"0"间隙时,选用打底焊模式的工艺包;组对1 mm间隙时,选用电弧冷焊模式的工艺包。 The butt welding tests of Q345E thin plate with thickness of 3 mm were carried out by using high frequency pulse MAG backing welding mode and arc cold welding mode respectively. The small deformation process and mechanical properties of butt welding joint were studied, the metallo-graphic test was carried out, the causes of welding defects were analyzed, and the laws of welding residual stress and welding deformation were summarized. The results show that high frequency pulse MAG welding is suitable for small deformation butt welding of Q345E steel plate with 3 mm gap. When assembling "0" gap, the process package of backing welding mode is selected; when assembling 1 mm gap, the process package of arc cold welding mode is selected. Q345E薄板 高频脉冲MAG焊 焊接残余应力 焊接变形 接头力学性能 Q345E thin plate high frequency pulse MAG welding welding residual stress welding deformation mechanical properties of joint TG457.11 2022-03-08 9 51