【摘要】 针对中碳调质高强钢与中大直径Q235空心螺柱焊接过程中易出现的偏弧、气孔、脆硬相多等缺陷，提出旋弧磁场空心螺柱焊焊接方法。试验结果表明：添加旋弧磁场后，偏弧现象得到明显改善，所得到的焊接接头熔合均匀，焊缝饱满。接头微观组织主要为马氏体与贝氏体，熔池在旋弧磁场的作用下流动性提高，组织较致密。对于外径12 mm、内径6 mm的空心螺柱，在旋弧电压6 V、焊接电流700 A、焊接时间400 ms条件下，接头最高抗剪强度达到314 MPa。更多还原

【Abstract】 Aimed at the defects like arc deflection, porosity and many brittle and hard phases in the welding process of medium carbon quenched and tempered high strength steel and large diameter Q235 hollow stud, a welding method of rotating arc magnetic field hollow stud welding was proposed. The test results show that the arc deflection phenomenon is obviously improved after the addition of rotating arc magnetic field, and the fused welded joint is uniform with full weld seam. The microstructure of the joint is mainly martensite and bainite. The fluidity of the molten pool increases under the action of rotating arc magnetic field, with relatively compact microstructure. For hollow studs with outer diameter of 12 mm and inner diameter of 6 mm, the joint’s maximum shear strength can reach 314 MPa under the conditions of rotating arc voltage of 6 V, welding current of 700 A and welding time of 400 ms.更多还原