摘要
低应力无变形(LSND)焊接法是一种在薄板焊接时,利用特定的预置温度场积极控制焊接热应力应变发展过程的新技术。采用相应措施防止工件在焊接温度场共同作用下的瞬态失稳变形,以保证有效的“温差拉伸效应”跟随焊接热源,定量地控制焊缝纵向压缩塑性应变。改变焊后残余应力场使之重新分布,采用常规的焊接方法和焊接工艺参数,即可达到焊后低应力无变形的效果。
Low Stress Non—Distortion(LSND)welding is a new technique for in-process active control of welding stress and distortion during the manufacturing ofthin walled structural elements.The method involves creating a specific uneventemperature distribution on the workpiece.Restraining forces are applied to theworkpiece in order to prevent the out—of—plane buckling which is caused byboth the heating and welding operation.Therefore,an induced“streching effect”which follows the welding heat source,controls quantitatively the formation ofincompatible compressive plastic strain and thermal stress or,alternatively,redistributes the residual stress field across the workpiece.In this way,the lowstress non-distortion results can be achieved using the same parameters as in theconventional welding methods.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
1990年第4期231-237,共7页
Transactions of The China Welding Institution
