用旋转挤压方法控制薄板的焊接变形

提出了旋转挤压控制薄板焊接变形的新方法,它足利用特定形状的挤压头对焊缝及近缝区金属进行旋转挤压,产生拉伸塑性应变,减小甚至抵消残余压缩塑性应变,以此来消除焊接残余变形.该方法处理后的焊道表面平整光滑,减小了应力集中.结果表明,旋转挤压法能将薄壁构件焊接变形降到非常低的水平,选择适当的工艺参数,该方法能将焊接残余变形控制在常规焊接状态的3%以下.旋转挤压控制薄板焊接变形的效果与多个工艺参数有关,只有当各个工艺参数取值适当且匹配良好时,才能取得良好的焊接变形控制效果.

Residual distortion of thin-plate weldments controlled by rotating extrusion

A new technology was proposed to control residual distortion of thin-plate weldments with rotating extrusion.Extrusion force with is exerted by rotary action of an extrusion head on weld and zone near the weld to form the tensile plastic strain, which can counteract the welding-induced residual compressive plastic strain, and reduce or even eliminate the welding residual distortion.The surface of weld processed by this method is flat and smooth, and the stress concentration in theweld is decreased obviously.Experimental results showed that this technology can decrease the welding residual distortion of thin-plate weldments to below 3% of that of conventional weldments.The control effect of welding residual distortion has relation to some technical parameters.A good control effect of welding distortion can be acquired only when all kinds of technological parameters are matched properly.