摘要
为了减少焊接热输入和飞溅,降低焊接残余应力和焊接变形,研究了CMT平板堆焊道间距及焊枪倾角对焊缝成形的影响,进行了CMT窄间隙多层多道焊接试验.结果表明,在窄间隙焊接时,第1层焊道间距为单一焊缝熔宽的2/3,以后各层焊道间距为单一焊缝熔宽的5/9,可以获得良好的焊缝成形;在窄间隙侧壁焊接时,焊枪与水平面夹角为75°,焊丝端部距侧壁1-2 mm时,侧壁熔深都在1 mm以上,成形较好,适于侧壁的焊接.采用CMT焊接系统,能够以较低的热输入进行窄间隙多层多道焊,从而为降低焊接残余应力和减少焊接变形提供了一种简单可行的方法.
In order to reduce spatter,welding heat input,welding residual stress and welding distortion,the influences of welding space of CMT flat overlaying and torch angle on welding formation are studied,and the welding test of CMT multi-layer narrow gap welding is carried out.The results show that good welding formation can be got when the welding space is 2/3 of the single weld width of the first layer and 5/9 of the single weld width of the other layers in the narrow gap welding.In the narrow gap sidewall welding,the good welding formation and sidewall penetration depth can be got when the welding torch at 75° to the horizontal and wire ends 1～2 mm are away from the sidewall.The multi-layer narrow gap welding with low welding heat input can be executed by adopting CMT welding system.A feasible and simple method is provided for reducing welding residual stress and welding distortion.
出处
《江苏科技大学学报（自然科学版）》
CAS
北大核心
2011年第2期126-130,共5页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
国家科技支撑项目(B072006844-06)
关键词
窄间隙焊
CMT
焊缝成形
narrow gap welding
cold metal transfer
welding formation
