A review of the metallurgy of heat treatment of welded joints

This paper deals with the metallurgical changes which occur during heat treatment of welded joints. Stress relieving heat treatment in the temperature range below A 1, the normalizing heat treatment and the heat treatment in the intercritical range A 1–A 3, are all considered. The thermal regime of...

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Bibliographic Details
Published in:The International journal of pressure vessels and piping 1985, Vol.20 (3), p.223-237
Main Author: HRIVNAK, I
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Joining, thermal cutting: metallurgical aspects
Metals. Metallurgy
Welding
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Summary:This paper deals with the metallurgical changes which occur during heat treatment of welded joints. Stress relieving heat treatment in the temperature range below A 1, the normalizing heat treatment and the heat treatment in the intercritical range A 1–A 3, are all considered. The thermal regime of welding is described. The practice of intercover of the weldment before applying PWHT to ambient temperature is described. It is stressed that the aim of stress-relieving heat treatment is not only to relax internal stresses but also to improve the microstructure and impact properties of HAZ and weld metal, to improve dimensional stability and increase resistance against stress corrosion. Examples are given of the effect of annealing in the intercritical range A 1–A 3 on the improvement in toughness of electroslag welded joints. Changes in dislocation distribution and density, precipitation processes and grain sizes during PWHT are described.
ISSN:0308-0161
1879-3541
DOI:10.1016/0308-0161(85)90040-7