摘要
采用薄壁不锈钢管液压成形生产的EGR波纹管,广泛应用于欧美发达国家汽车排气系统。为提高制造波纹管用薄壁不锈钢管的生产质量和效率,对0.25 mm厚的AISI304不锈钢薄板进行了高速激光焊接工艺试验。以波纹管用薄壁不锈钢管的焊接质量要求为目标,通过焊缝外观检查、微观组织分析和力学性能检测等手段,研究了离焦量、对接间隙、错边量、激光功率等工艺参数对薄壁不锈钢激光高速焊接的影响。结果表明,焊接速度为12 m/min的激光高速焊接可以实现0.25 mm厚不锈钢的对接焊,焊缝成形良好,无焊接缺陷。离焦量在±1 mm之间,对接间隙小于板厚的10%时,均可得到焊缝成形良好、热影响区窄的焊缝。对焊板材错边量越小,力学性能越好。对于0.25 mm的不锈钢板材,其错边量应控制在0~0.04 mm。对于错边稍大的工件,提高激光焊接功率可提高容错能力。
EGR corrugated pipe produced by hydraulic forming of thin wall stainless steel pipe is widely used in the automotive exhaust system in developed countries. In order to improve the production quality and efficiency of thin wall stainless steel pipe used for corrugated pipe, the high speed laser welding tests of 0.25 mm thick AISI304 stainless steel sheet were carried out. Taking the welding quality requirement of thin wall stainless steel pipe for corrugated pipe as the standard, the influence of the parameters such as defocus amount, butt gap, misalignment value and laser power on the high speed laser welding of thin wall stainless steel was stuedied through the inspection of weld appearance, microstructure analysis and mechanical properties testing. The results show that the butt welding of 0.25 mm thick stainless steel with good weld forming and no welding defects can be achieved by high speed laser welding with welding speed of 12 m/min. When the defocus amount is within ±1 mm, and the butt joint gap is less than 10% of the sheet thickness, the weld with good weld forming and narrow heat affected zone can be obtained. The smaller the disalignment value of butt welding sheets is, the better the mechanical properties are. For 0.25 mm thick stainless steel sheet, the disalignment value should be controlled in the range of 0-0.04 mm. For the workpiece with higher disalignment value, increasing the laser welding power can improve the fault tolerance.
作者
辛立军
苏海
周岐
王德仓
XIN Lijun1, SU Hai2, ZHOU Qi1, WANG Decang1(1. Institute of Materials Science and Engineering, Liaoning University of Technology, Jinzhou 121001, China; 2. Jinzhou U Bridge Auto Parts Co., Ltd., Jinzhou 121001, Chin)
出处
《热加工工艺》
CSCD
北大核心
2018年第3期57-60,共4页
Hot Working Technology
关键词
薄壁不锈钢管
激光焊接
高速焊接
焊接工艺
thin wall stainless steel tube
laser welding
high speed welding
welding technology
