焊后局部热处理区域布置对厚壁圆筒环缝残余应力的影响
Effect of local post weld heat treatment zone arrangement on residual stress of thick-walled pipe girth weld
刘姿 1孔为民1
作者信息
- 1. 中北大学创新创业学院,山西太原 030051
- 折叠
摘要
采用粘弹塑性有限元方法,研究了 16MND5钢厚壁圆筒在不同局部热处理标准(B31.1、B31.3、ASME section NB、BS2633和AWS D10.10)加热条件下焊接残余等效应力、环向应力及轴向应力的变化及分布情况.综合分析了焊缝中心及其附近区域的焊接残余应力、加热区边缘附加热处理应力,并讨论了加热宽度、保温宽度对焊后局部热处理效果的影响.结果表明,局部热处理后,加热区边缘不均匀加热引起一定的应力上升,保温区的存在可以缓解温度梯度,从而使加热区边缘的附加应力降低.对厚壁圆筒来说按AWS D10.10标准局部热处理时,焊缝中心可达到与整体热处理相当的效果,焊接残余应力消除效果最好.
Abstract
Variation and distribution of welding residual equivalent stress,circumferential stress and axial stress in 16MND5 steel thick-walled cylinders under different heating conditions of local heat treatment standards(B31.1,B31.3,ASME section NB,BS2633 and AWS D10.10)were studied by using the viscoelastic plastic finite element method.A comprehensive analysis was conducted on the welding residual stress in the center and vicinity of the weld seam,as well as on the heat treatment stress attached to the edge of the heating zone.The influence of heated band width and insulation band width on the local post weld heat treatment effect was also discussed.The results show that after local heat treatment,uneven heating at the edge of the heating zone causes a certain increase in stress,and the presence of the insulation zone can alleviate the temperature gradient,thereby reducing the additional stress at the edge of the heating zone.For thick-walled cylinders,when subjected to local heat treatment according to AWS D10.10 standard,the center of the weld seam can achieve a similar effect as the overall heat treatment,and the residual stress relief effect of welding is the best.
关键词
厚壁圆筒/16MND5钢/焊后局部热处理/加热宽度/保温宽度Key words
thick-walled pipe/16MND5 steel/local post weld heat treatment/heated band width/insulation band width引用本文复制引用
出版年
2024
NETL
NSTL
万方数据