随焊旋转挤压控制焊接热裂纹试验分析

Experimental investigation on controlling welding hot crack with welding with trailing rotating extrusion

介绍了随焊旋转挤压法的基本工作原理及其对焊接残余变形的控制效果.以高强铝合金2A12T4为研究材料,对随焊旋转挤压控制焊接热裂纹进行了试验研究和机理分析.结果表明,在合适的工艺参数下,该方法能够有效抑制铝合金焊接热裂纹的产生和扩展.挤压头与焊枪的距离和其对工件的垂直压力是决定焊接热裂纹控制效果的两个重要参数.随焊旋转挤压控制焊接热裂纹的机理是基于对起弧端热裂纹的压合和对焊件回转变形的拘束作用.

The basic principle of welding with trailing rotating extrusion（WTRE） and its control effect in mitigating welding distortion are introduced.The impact of WTRE on welding hot crack of 2A12T4 aluminum alloy is investigated and analyzed.Experimental results show that with proper technological parameters,WTRE can inhibit the initiation and propagation of welding hot cracks effectively.The distance between extrusion tool and welding torch as well as the vertical force acting on the weldment are key technological parameters determining the control effect of welding hot cracking.WTRE method controls welding hot crack based on the binding to hot cracks at arc-starting end and the restraint action to externally expanded deformation of weldments.