工艺垫片对大差厚不锈钢板电阻点焊工艺的影响  

Study on Influence of Cover Plate on Resistance Spot Welding Process of Largely Unequal-Thickness Stainless Steel Plates

作　　者：吴泽 徐野 韩晓辉 李永兵[1] WU Ze;XU Ye;HAN Xiaohui;LI Yongbing(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;CRRC Qingdao Sifang Co.,Ltd.,Qingdao Shandong 266111,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]中车青岛四方机车车辆股份有限公司,山东青岛266111

出　　处：《机械设计与研究》2023年第1期144-148,共5页Machine Design And Research

摘　　要：轨道交通车辆为满足轻量化、制造成本、环保等综合要求,在车身设计中大量使用大差厚高强韧不锈钢板材。然而大差厚板材组合导致电阻点焊过程熔核产生偏移现象,使得薄板侧焊透率严重不足,焊接接头性能无法满足使用要求。在大差厚不锈钢组合焊接中引入工艺垫片,以提高薄板侧焊透率从而改善焊接接头性能。研究了不同厚度工艺垫片对焊点的影响,揭示了工艺垫片的引入对焊点表面质量、熔核尺寸、力学性能和断裂模式等的作用机制及提升效果,验证了引入工艺垫片改善大差厚不锈钢板电阻点焊熔核偏移的有效性。To meet the comprehensive requirements of lightweight,manufacturing cost and environmental concerns,a large number of high-strength and tough stainless steel plates are used for body design in the rail transit vehicle industry.However,the combination of largely unequal-thickness stainless steel plates will cause the nugget to be offset during the spot welding process,resulting in a severe shortage of penetration rate on the thin plate side,and the performance of the welded joints cannot meet the requirements.In this paper,cover plates are introduced during the welding process of largely unequal-thickness stainless steel plates to improve the penetration rate of the thin plate side and thus improve the performance of the welded joint.The influence of cover plates of different thicknesses on the welded joints is studied,and the mechanism and improvement of the introduction of cover plates on the surface quality,nugget size,mechanical properties,and fracture mode of the welded joints are revealed.The effectiveness of introducing cover plate to improve the nugget offset in resistance spot welding of largely unequal-thickness stainless steel plates is verified.

关 键 词：大差厚板 工艺垫片 电阻点焊 301L不锈钢 

分 类 号：TG441[金属学及工艺—焊接]