高强钢低匹配等承载对接接头焊接残余应力调匀能力  

Homogenization capacity of welding residual stress in under-matching ELCC butt joint of high strength steel

作　　者：赵智力[1] 王光临[1] 张远健[1] 方洪渊[2] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,哈尔滨150040 [2]哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨150001

出　　处：《焊接学报》2018年第7期111-114,共4页Transactions of The China Welding Institution

摘　　要：借助有限元软件研究了高强钢对接接头中焊接残余应力的调匀情况.结果表明,因母材塑性储备不足,所有接头焊后横向、纵向拉伸峰值应力均在焊接残余应力的基础上不断增加,但接头各区域应力增速不同,最终残余应力均未完全调匀.低匹配静载ELCC接头高塑性、低屈强比的盖面焊道位于高值残余应力所在的焊缝及近缝区母材表面并分担载荷,使该区应力增速放缓,故其残余应力调匀能力优于等匹配接头.考虑焊接残余应力的ELCC接头静载失效更可能发生在母材区,这与ELCC接头的设计目标相符.明确了静载ELCC设计可以忽略焊接残余应力的影响.The homogenization of welding residual stress in butt joint of high strength steels is studied by means of finite element software.The results indicate that the peak stress in the all of the welded joints in the transverse and longitudinal tensile process will increase continuously on the basis of welding residual stress due to the insufficient plastic reserve of the base metal,and the stress growth rate in every region of the butt joint is different.Finally,the residual stress is not absolutely homogenized.Due to the cover passes with high plasticity and low yield ratio in the under-matching equal static ELCC joints locate in weld and surface of the near the seam base metal where distributed the peak value of welding residual stress,and share the tensile load,resulting in that the stress growth rate of the base metal zone near seam is slow,therefore,its homogenizing capacities of welding residual stress is better than that of the equal-matching joint.Considering the effect of welding residual stress,the static load failure of ELCC joint is more likely to occur in the base metal zone rather than welding zone,which is consistent with the original design goal.It is clear that the influence of welding residual stress can be neglected in the design of static load ELCC of under-matching butt joint.

关 键 词：高强钢 低匹配对接接头 等承载能力 焊接残余应力 调匀 

分 类 号：TG407[金属学及工艺—焊接]