【作者】 吴世凯； 肖荣诗； 陈铠；

【Author】 Wu Shikai,Xiao Rongshi,Chen Kai

【机构】 北京工业大学激光工程研究院；

【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。作为一种先进连接方法,激光焊接成为该类结构连接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,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以实现筋板完全熔合,焊趾过渡均匀、圆滑;但是由于小孔瞬间失稳、塌陷形成的气孔难以克服。采用CO₂激光-TIG电弧复合焊接较好的解决了上述问题,可以获得焊趾形状理想、没有气孔缺陷的薄壁T型接头。更多还原

【Abstract】 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.更多还原