Study on MAG welding procedure of BS960E high strength bainite steel for heavy duty vehicle

重载车用BS960E高强贝氏体钢MAG焊接工艺研究 Study on MAG welding procedure of BS960E high strength bainite steel for heavy duty vehicle 江勇 JIANG Yong 1 first-author 冯仁锦 FENG Renjin 1 张成竹 ZHANG Chengzhu 2 刘艳 LIU Yan 2 刘阳 LIU Yang 1 蔡新 CAI Xin 1 秦祥春 QIN Xiangchun 1 眉山中车物流装备有限公司 眉山中车物流装备有限公司 Meishan CRRC Logistics Equipment Co.,Ltd. Meishan CRRC Logistics Equipment Co.,Ltd. 西南交通大学 西南交通大学 Southwest Jiaotong University Southwest Jiaotong University 针对新型重载汽车选用的BS960E贝氏体高强钢,通过优化焊接接头坡口、控制电流电压等手段,获得了优良的MAG焊接工艺。并使用高速摄像和焊接在线监测技术进一步探索了MAG焊电源的动、静特性以及熔滴过渡行为,对焊接接头的金相组织进行了分析。试验发现:在最优工艺条件下,焊接电流稳定且电压值较低,熔滴过渡形式为一脉一滴的射滴过渡。最终得到的接头焊缝组织主要为回火马氏体、针状铁素体和粒状贝氏体,这些组织的产生使得焊缝的硬度较母材有明显上升。 BS960E bainite high strength steel is selected for new heavy duty vehicle. The excellent MAG welding procedure of BS960E bainite high strength steel is obtained by means of optimizing welding groove and controlling current and voltage. On this basis,the dynamic and static characteristics of MAG welding power supply and the droplet transfer behavior are further explored by using high speed photography and online welding monitoring technology,and the metallographic structure of the welded joint is analyzed. The results show that the welding current is stable and welding voltage is low under the optimal procedure conditions,and the metal transfer mode presents one droplet per pulse. The microstructure of the joint is mainly tempered martensite,acicular ferrite and granular bainite,which makes the hardness of the weld higher than that of the base metal. 贝氏体高强钢 MAG焊 高速摄像 熔滴过渡 bainite high strength steel MAG welding high speed photography metal transfer U466;TG457.11 国家重点研发计划资助项目：公铁联运公路半挂车关键技术研究及公路半挂车标准体系研究(2017YFB1201303-04) 2022-03-08 6 50