Study on low temperature and narrow heating bands of post weld heat treatment for girth welds stress reduction of long-distance pipelines

IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL
Shengyuan Niu, Xueda Li, Congyue Liu, Liying Li, Tao Han, Bin Han
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Abstract

Residual stress affects the service safety of pipelines, but there are few efficient methods to reduce the residual stress, especially for long-distance pipelines with large diameters. In this paper, a Secondary Post Weld Heat Treatment (S-PWHT) stress reduction method with low temperature and two narrow heating bands is proposed, and this method fully considers the failure of the corrosion resistance layer caused by high temperature. The temperature distribution and stress distribution under different S-PWHT parameters are compared to obtain the optimal S-PWHT parameters using finite element numerical simulation. The thermocouples are conducted to verify the temperature, and the coercivity experiment is used to verify the stress distribution. Results show that two heating bands width of 80 mm and a peak temperature of 120 °C are the optimal S-PWHT parameters with the stress reduced by 61 %. Besides, the levels of stress reduction on the inner surface and the HAZ are higher than those on the outer surface and the base metal, respectively. The high-stress zone is transferred from the inner surface to the outer surface, and from the HAZ to the base metal. Furthermore, the stress reduction mechanism of S-PWHT has been revealed through constraint theory. Temperature change is the initial force, and the constraint is the driving force for stress reduction.

Abstract Image

降低长输管道环缝焊缝应力的低温窄加热带焊后热处理研究
残余应力会影响管道的使用安全,但目前几乎没有有效的方法来降低残余应力,尤其是对于大直径的长输管道。本文提出了一种采用低温和两个窄加热带的二次焊后热处理(S-PWHT)应力降低方法,该方法充分考虑了高温导致的防腐层失效。通过比较不同 S-PWHT 参数下的温度分布和应力分布,利用有限元数值模拟获得了最佳 S-PWHT 参数。通过热电偶实验验证温度,通过矫顽力实验验证应力分布。结果表明,两个加热带宽度为 80 毫米,峰值温度为 120 °C,是最佳的 S-PWHT 参数,应力降低了 61%。此外,内表面和热影响区的应力降低水平分别高于外表面和基体金属。高应力区从内表面转移到外表面,从 HAZ 转移到基体金属。此外,还通过约束理论揭示了 S-PWHT 的应力降低机制。温度变化是初始力,约束是应力降低的驱动力。
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来源期刊
CiteScore
5.30
自引率
13.30%
发文量
208
审稿时长
17 months
期刊介绍: Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.
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