摘要
在成功地研究并开发了薄壁构件低应力无变形焊接新技术的基础上，把靠预置温度场静态控制焊接应力与变形的方法发展到动态控制法，这一新构思所形成的动态控制焊接应力与变形的新技术的原理在于：不再依赖预置温度场，而是直接利用电弧在薄壁构件上所形成的焊接温度场，建立一个特殊构造的热潭跟随电弧，构成“热源－热潭”多源系统，在熔池后的高温焊缝区产生强烈的局部急冷拉伸作用，控制和补偿焊接时产生的压缩塑性变形。达到薄壁构件低应力无变形的焊接效果。
A newly developed method for dynamic in process control of welding stressand distortion of thin-walled structural elements is discussed in this paper。The DynamiCally Controlled Low Stress Non-Distortion(D.C.LSND)welding processprovides a tensile effect created by a local spot intensive cooling of just solidified weldwhile it is still at the high temperature state. This localized tensile effect follow-ing the welding heat source dynamically and quantitatively controls the formation ofincompatible compressive plastic strain and thermal stress during the welding process.A new device of multi-source(heat source-heat sink)system have been developed.Experiments show that good results of low residual stress levels and complete freedomfrom distortion can be achieved. It promises a wide prospect for engineeringapplication of non -distortion welding for thin-walled structures.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
1994年第1期8-15,共8页
Transactions of The China Welding Institution
基金
国家自然科学基金
关键词
焊接
残余应力
动态控制
变形
non-distortion welding
dynamic control of welding stress and distor-tion
residual stress
