减摩法调控结构钢焊接残余应力技术研究

Research on Control Technique of Welding Residual Stress in Structural Steel

根据焊缝固态收缩对焊接残余应力形成的作用,课题组进一步研究了将滑动摩擦变滚动摩擦的方法来减轻焊件自重拘束以达到调控焊接残余应力的目的.对不同板厚的薄钢板对接接头进行了试验研究,通过盲孔法测试了近缝区的焊接残余应力.试验结果表明,在采取减轻自重拘束工艺措施的情况下,薄板对接接头上的焊接残余应力峰值及平均值均显著降低.

Based on the influence of the solid shrinkage of weld seam on welding residual stress, value of welding residual stress is decreased through reducing the friction resistance, so the further studies on the measure through changing sliding friction into rolling friction were taken. The welding residual stress of varied thickness of plate in butt joints was experimentally studied and measured through bore-hole stress relief method. The results obtained from experiments show that the welding residual stress in structural steel butt joints is decreased evidently.