光束偏移量对Q235/304激光焊接接头组织与性能的影响

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英文篇名：Effect of laser beam displacement on microstructure and mechanical properties of Q235/304 by laser welding 作者：王家胜 ; 舒林森 英文作者：WANG Jia-sheng;SHU Lin-sen;School of Mechanical Engineering,Shaanxi University of Technology;Shaanxi Key Laboratory of Industrial Automation; 关键词：激光焊接 ; 光束偏移量 ; 异种钢焊接 ; 显微组织 ; 接头性能 英文关键词：laser welding;;laser beam displacement;;dissimilar steel welding;;microstructure;;mechanical property 中文刊名：陕西理工大学学报(自然科学版) 英文刊名：Journal of Shaanxi University of Technology(Natural Science Edition) 机构：陕西理工大学机械工程学院;陕西省工业自动化重点实验室; 出版日期：2019-04-18 出版单位：陕西理工大学学报(自然科学版) 年：2019 期：02 基金：国家自然科学基金资助项目(51505268);; 陕西理工大学研究生创新基金资助项目(SLGYCX1827);; 陕西理工大学人才启动基金资助项目(SLGKYQD2-26) 语种：中文; 页：6-10 页数：5 CN：61-1510/N ISSN：2096-3998 分类号：TG456.7

摘要

采用不同的激光束偏移量对Q235和SUS304两种薄钢板进行对接焊试验,利用光学显微镜、显微硬度仪和拉伸试验机研究了光束偏移量对焊接接头组织和性能的影响规律。结果表明:激光束偏向Q235侧时焊缝表面成形质量好,两侧金属均充分融化,熔池形貌较好;随着光束向SUS304侧移动,Q235侧热影响区组织中马氏体含量逐渐减少,铁素体含量增加且晶粒急剧长大;接头最大硬度出现在焊缝区,是Q235母材硬度的3. 5倍;接头平均抗拉强度可达300 MPa,且断裂位置均位于Q235母材处,偏移量为-0. 1 mm时,接头的综合拉伸性能最好。
        The butt welding experiment of Q235 and SUS304 thin steel plates was carried out with different laser beam excursion,and the effect of beam migration on the microstructure and properties of welded joint was studied by optical microscope,microhardness tester and tensile testing machine. The results show that: when the laser beam is inclined to the side of Q235,the weld surface has good forming quality,the amount of metal melting on both sides is equal,and the weld pool morphology is good; As the beam moves towards SUS304,the martensite content in the heat affected area on the Q235 side gradually decreases,the ferrite content increases and the grains grow rapidly; The maximum hardness of the welding joint appears in the weld zone,and its hardness is 3. 5 times that of Q235 base metal; The average tensile strength of welded joints is up to 300 MPa,and the fracture positions are all located at the base material of Q235. When the offset is-0. 1 mm,the tensile strength and plasticity of welded joints are the best.

引文

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