Cause analysis of insufficient impact toughness and heat treatment repair process of G115 steel pipe SAW weld

doi:10.13251/j.issn.0254-6051.2023.04.046

Abstract

Abstract: A large-diameter thick wall G115 steel pipe was welded by submerged arc automatic welding (SAW). After post weld tempering at 785 ℃, the impact absorbed energy of the weld is lower than the minimum value required by the standard. Based on the analysis and test of the welding method, welding material and tempering temperature, the results show that the tempering temperature of the weld exceeds the Ac₁ point of the clad metal, resulting in incomplete phase transformation structure, and the interaction of various factors such as carbide re-dissolution, reduction of precipitation strengthening, martensite substructure and dislocation density, as well as growth and coarsening of precipitated phases, eventually leads to the decrease of weld impact property. Through the heat treatment repair process of normalizing at 1080 ℃ for 3 h and tempering at 770 ℃ for 6.5 h, the impact property of the weld is greatly improved.

Key words: G115 steel pipe, submerged arc automatic welding, impact property, post weld heat treatment

CLC Number:

TG445

Tian Linan, Zhang Fengshou, Li Junfeng, Bai Li, Wang Lu, Qiao Lijie, Feng Keyun. Cause analysis of insufficient impact toughness and heat treatment repair process of G115 steel pipe SAW weld[J]. Heat Treatment of Metals, 2023, 48(4): 293-297.

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