电焊机2024，Vol.54Issue(10)：42-52,92,12.DOI:10.7512/j.issn.1001-2303.2024.10.05
激光螺旋点焊的断裂行为与断口研究
Study on the Microstructure and Mechanical Mroperties of Laser Spiral Spot Welding
摘要
Abstract
This article uses a laser spiral welding system equipped with a vibrating mirror and a robot to weld 1 mm high-strength steel for automobiles.In order to evenly distribute the heat input of the solder joint,a type of Archimedean spiral was designed,with an outer diameter of 5.0 mm for the scanning path.The spiral is composed of multiple semicircles and a 5 π mm circular path on the periphery,R1=0.5 mm,R2=1.0 mm,R3=1.5 mm,R4=2.0 mm,R5=2.5 mm.The fracture behavior of laser spiral spot welding was analyzed,and the stress process,crack propagation path,and fracture surface during the ten-sile shear process of laser spiral spot welding were studied.Under the action of tensile and shear forces,the main fracture failure modes of laser spiral spot welding are single-sided weld tearing fracture and double-sided weld tearing fracture.The initiation and propagation of cracks are both along the boundary between the fusion zone and the heat affected zone.The pro-portion of large angle grain boundaries affected by coarse grain heat is relatively small at 18.69%,with a maximum KAM mean of 0.65.The stress and strain present are relatively large,making cracks more likely to initiate and propagate in the coarse grain heat affected zone.关键词
激光螺旋点焊/汽车用高强钢/疲劳断裂/失效形式/扫描路径Key words
laser spiral spot welding/high-strength steel for automobiles/fatigue fracture/failure modes/scan path分类
矿业与冶金引用本文复制引用
高紫豪,杨尚磊,毕军航,赵辛龙,田嘉伟..激光螺旋点焊的断裂行为与断口研究[J].电焊机,2024,54(10):42-52,92,12.基金项目
上海市科委地方院校能力建设项目(20030500900) （20030500900）
上海市科委专业技术服务平台(21DZ2294200) （21DZ2294200）
