振动时效工艺在消除膨胀波纹管残余应力中的应用

膨胀波纹管体冷压成型后存在较大的残余应力常导致管端面严重变形和尺寸不稳定,已成为制约管体焊接连接质量和效率提高技术瓶颈。探索振动时效法用于消除或减弱波纹管体残余应力的可行性。结合室内试验和现场试验数据,建立振动时效法适用的关键技术、工艺参数、评价方法以及后处理分析手段。采用所建立的评价体系,通过振动时效参数曲线观测和盲孔法残余应力测量,评定了该试验振动过程及振动时效效果有效性,这证明振动时效工艺可显著降低膨胀波纹管残余应力,能够满足膨胀波纹管焊接等工程需要,提高其尺寸稳定性。

Application of vibratory stress relief in relaxation of residual stress for expandable corrugated liners

The over residual stress chould be left in the expandable corrugated liner after deformation under temperature. This will lead to both the serious deformation and the unstable dimension of the liner ends. That has already become the key factor to prevent us from getting higher quality and more welding efficiency. This paper aims to work out a feasible method to remove residual stress as much as possible. Hence we develop a set of new engineering technology, parameter, appricial methods, and the post analysis method based on plenty of datum from laboratory and well cite. Here the new method is used to verify the effectiveness of the parameter curves and residual stress measured by blind-hole method. The result tells that it can be applied to decrease residual stress greatly in liners. So the Vibratory Stress Relief is believed to be a fair well way to improve the welding efficiency and obtain better stability of the liner section.