动态控制的低应力无变形焊接新技术

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，建立一个特殊构造的热潭跟随电弧，板成“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

New technique for dynamically controlled low stress non-distortion welding

A newly developed method for dynamic in process control of welding stress and distortion of thin-walled structural elements is discussed in this paper.The DynamiCally Controlled Low Stress Non-Distortion(D.C.LSND) welding process provides a tensile effect created by a local spot intensive cooling of just solidified weld while it is still at the high temperature state. This localized tensile effect following the welding heat source dynamically and quantitatively controls the formation of incompatible 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 freedom from distortion can be achieved. It promises a wide prospect for engineering application of non-distortion welding for thin-walled structures.