摘要
在船舶、高速列车、航空航天工业中大量应用了焊接薄壁T型结构。激光焊接是该类结构最具潜力的连接技术。采用底板顶面施焊的布置方式,进行了不锈钢薄壁T型接头的CO2激光及CO2激光-TIG电弧复合焊接试验,研究了焊接工艺参数对剖口形状、焊缝成形及气孔形成倾向的影响规律。试验结果表明:单激光焊接时,采用优化的工艺参数可实现筋板完全熔合,焊趾过渡均匀、圆滑;但由于小孔瞬间失稳、塌陷形成的气孔难以克服。采用CO2激光-TIG电弧复合焊接能较好解决上述问题,可获得焊趾形状理想、无气孔缺陷的薄壁T型接头。
In shipbuilding, rail vehicle and aircraft industries, thin walled T-joint structures are extensively employed. As an advanced joining technology, laser beam welding have a high potential for the fabrication of such structures. In this paper, laser welding and laser-TIG hybrid welding process, in which the laser beam irradiates from the back side of the base plate, were supposed to weld the thin walled stainless steel T-joint. The effects of the welding parameters on the weld bead profiles and pores were investigated with X-ray transmission images and optical microscopy. The experiment results show that ideal fillet welds at both sides of the web plate can be obtained in laser welding of T-joint, but the pores, which are attributed to the collapse of the keyhole, remain a problem. Applying a CO2 laser-- TIG arc hybrid heat source, weld beads free of pores and with perfect profiles can be obtained after optimization of the welding parameters.
出处
《电加工与模具》
2009年第6期29-33,共5页
Electromachining & Mould
基金
北京市教委科技发展计划资助项目(KZ200710005003)
关键词
CO2激光
复合焊接
薄壁T型接头
焊缝成形
气孔
CO2 laser beam
hybrid welding
thin walled T butt joint
bead profile
porosity
