Significance of changes in residual stresses and mechanical properties due to SMAW repair of girth welds in linepipe
This program assessed the effects of SMAW repair welding on changes in surface residual stress distribution, fracture toughness and hardness around girth weld joints in linepipe. The following types of repair welds were studied: a part wall repair, a multiple part wall repair and full wall repair. The results were compared with a non-repaired weld sample. It was found that for the weld samples studied in this program, the full wall repair produced the most severe residual stress distribution followed by the multiple and single part wall repairs. The single repair only slightly increased the residual stress distribution when compared to the as-welded condition. Dramatic reductions in toughness were found in the multiple and full repairs due to coarse-grained regions produced during the repair operations. The single part wall repair exhibited an increase in toughness as a result of the addition of a cosmetic capping pass which resulted in greater grain refinement. This suggests that repair procedures utilizing a stringer or temper bead technique may reduce the effect of weld repairs on toughness.
- Research Organization:
- Edison Welding Inst., Columbus, OH (United States)
- Sponsoring Organization:
- AGA; American Gas Association, Inc., Arlington, VA (United States)
- OSTI ID:
- 5846869
- Report Number(s):
- EWI-92008199; PR-185-905; CNN: PR-185-905; Project J7115
- Resource Relation:
- Other Information: Submitted to the Welding Supervisory Committee, Pipeline Research Committee, American Gas Association, Arlington, Virginia
- Country of Publication:
- United States
- Language:
- English
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