Effect of local heat treatment on residual stresses in an in-service repair welded pipeline

Author:

Zhang Hongbo12,Lu Yongxin3,Yang Fengping12,Bai Qiang1,Liu Yinglai12,Zhang Xiaoyong3,Feng Hongfeng3

Affiliation:

1. CNPC Tubular Goods Research Institute , Xi’an , China

2. Beijing Longshine Oil Tubular Technology Co. Ltd , Beijing , China

3. School of Materials Science and Engineering, Xi’an Shiyou University , Xi’an , China

Abstract

Abstract The multi-pass fillet welds of casing pipe were welded onto the in-service pipeline, which is widely used in pipeline repairs. However, the residual stress of repairing welded joints is larger, and it is easy to cause cracks in the heat-affected zone. In this paper, the local heat treatment was used to adjust the residual stress of the repaired welded joint of the in-service pipeline. The results show that the local heat treatment is very useful for reducing the residual stress of the repair welding joint of the in-service pipeline.

Funder

National Pipe Network Scientific Research and Technology Development Project

Natural Science Basic Research Program of Shaanxi

Publisher

Walter de Gruyter GmbH

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

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