摘要

采用光纤激光器对2.8 mm厚800 MPa级热轧高强钢板进行了激光焊接, 通过调整激光功率获得了全熔透焊接接头, 观察了不同热输入下焊接接头的显微组织, 并测试了焊接接头的显微硬度、拉伸性能和冲击韧性, 研究了焊接接头显微组织与力学性能之间的关系。结果表明：焊接接头内不存在软化区, 焊接接头的抗拉强度可达到母材水平, 冲击功可达到母材的85.6%。

Abstract

The 2.8 mm thick 800 MPa grade hot-rolled high strength steel plates are welded with fiber laser. The fully-penetration laser welded joints are obtained by adjusting the laser power. The microstructures of laser weld joints are observed, and the microhardness, tensile properties and impact toughness of the laser welded joints are tested. The relationship between microstructure and mechanical properties of laser welded joints is studied. The results show that there was no softening zone in the welded joint, the tensile strength of the welded joint can reach that of the base metal, and the impact energy of the welded joint can reach 85.6% of the base metal.

补充资料

中图分类号：TG113

DOI：10.3788/cjl201946.0102002

所属栏目：激光制造

基金项目：国家自然科学基金(51775102)、中国博士后基金特别资助项目(2018T110542)、东北大学轧制技术及连轧自动化国家重点实验室开放基金(2016005)

收稿日期：2018-08-06

修改稿日期：2018-08-24

网络出版日期：2018-09-05

作者单位    点击查看

联系人作者：王晓南(wxn@suda.edu.cn)

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引用该论文

Huan Pengcheng,Wang Xiaonan,Zhu Tiancai,Chen Wengang,Hu Zengrong,Zhang Min,Chen Changjun. Microstructure and Mechanical Properties of Laser Welded Joint of 800 MPa Grade Hot-Rolled High Strength Steel[J]. Chinese Journal of Lasers, 2019, 46(1): 0102002

环鹏程,王晓南,朱天才,陈文刚,胡增荣,张敏,陈长军. 800 MPa级热轧高强钢激光焊接接头的组织和力学性能[J]. 中国激光, 2019, 46(1): 0102002