金属加工（热加工）Issue(10)：38-44,7.
高耐候钢手持激光填丝焊不同板厚对接接头组织与力学性能对比研究
Comparative study on microstructure and mechanical properties of butt joints with different thickness of high weathering steel by hand-held laser wire welding
王陆钊 1杨朔 2刘洋 2范晓睿 2刘德义 2侯金柱1
作者信息
- 1. 中车唐山机车车辆有限公司制造技术中心 河北唐山 064000
- 2. 大连交通大学材料科学与工程学院 辽宁大连 116028
- 折叠
摘要
Abstract
Using the 2.5mm and 4.0mm plate thickness high weathering steel Q350EWR1 hand-held laser wire welding butt joint as the research object,the microstructure of each area of the joint was observed and the mechanical properties were tested to analyze the influence of plate thickness on the microstructure and mechanical properties of the joint.The results show that the base material is composed of ferrite and pearlite.In the heat affected zone,there is only normal fire zone without coarse crystal zone.The weld is composed of proeutectoid ferrite and bainite.The hardness distribution of the two joints is in the shape of"mountain".Due to the changes in the microstructure and grain size of the weld and heat affected zone under the action of welding heat cycling,the relationship between the hardness size of the joint regions is as follows:weld zone＞heat affected zone＞base material.Due to the difference in pearlite and ferrite content in the base material area,the tensile strength of the 4.0mm butt joint is lower than that of the 2.5mm butt joint,and the tensile strength is 491 MPa and 558MPa respectively,both of which break at the base material.Under the specified cycle life condition of N=107,the fatigue strength of the 2.5mm butt joint is 203MPa.The fatigue strength of the 4.0mm butt joint is 144MPa,which is lower than that of the 2.5mm butt joint.关键词
高耐候钢/手持激光填丝焊/微观组织/力学性能Key words
high weathering steel/hand-held laser wire welding/micro structure/mechanical properties引用本文复制引用
王陆钊,杨朔,刘洋,范晓睿,刘德义,侯金柱..高耐候钢手持激光填丝焊不同板厚对接接头组织与力学性能对比研究[J].金属加工（热加工）,2025,(10):38-44,7.
