Research on reduction of residual stress in girth welds of large-diameter natural gas pipes by ultrasonic

IF 1.5 4区 工程技术 Q3 MECHANICS
Yukun Li, Longsheng Wang, S. Zhao, Jinglong Chang, Keren Shen, Shanyao Wang, Xiaojian Cao, Yixuan Wang
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引用次数: 1

Abstract

Excessive residual stress of the girth weld in pipes will directly damage the pipe strength during its operation. Accurate measurement and effective reduction of the residual stress can ensure the safety of natural gas pipes during their service. In this paper, an X80-type large-diameter natural gas pipe section with girth welds is taken as the research object. The coercive force method is used to characterize the residual stress of the girth weld and its surroundings, and then the distribution law of the residual stress of the girth weld and its surroundings is obtained based on the measurement results of the Blind-hole method; the ultrasonic impact method was used to reduce the girth weld residual stress, and the effect of the ultrasonic impact method on the residual stress reduction was studied by comparing changes of the distribution characteristics of the coercive force in the girth weld and its surroundings before and after the residual stress reduction in the natural gas pipes. Lastly, the in-situ test specimen is made to carry out the uniaxial tensile test so as to study the effect of the ultrasonic impact method on the tensile mechanical properties of pipe welds. This study clarifies the influence law of the ultrasonic impact on the mechanical properties of weld toe materials, and provided technical theoretical guidance for the reduction of field residual stress in natural gas pipes.
超声消除大直径天然气管道环焊缝残余应力的研究
管道环焊缝残余应力过大,将直接损害管道运行过程中的强度。准确测量残余应力,有效降低残余应力,可以保证天然气管道在使用过程中的安全。本文以x80型环缝大直径天然气管段为研究对象。采用矫顽力法对环焊缝及其周围的残余应力进行表征,然后根据盲孔法的测量结果得到环焊缝及其周围残余应力的分布规律;采用超声冲击法减小环焊缝残余应力,通过对比天然气管道环焊缝及其周围矫顽力分布特征的变化,研究超声冲击法对残余应力减小的影响。最后,制作原位试样进行单轴拉伸试验,研究超声冲击法对钢管焊缝拉伸力学性能的影响。本研究阐明了超声波冲击对焊趾材料力学性能的影响规律,为降低天然气管道现场残余应力提供了技术理论指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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