Journal of Welding and Joining
- Volume 12 Issue 4
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- Pages.41-49
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- 1994
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- 2466-2232(pISSN)
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- 2466-2100(eISSN)
A Study on the Welding Process of High Strength Steel Pipe in GTAW-SMAW and SAW
GTAW-SMAW와 SAW를 이용한 고장력강관의 용접에 대한 연구
Abstract
This study is to compare the welding quality of API 5L-X65 Steel- pipe's for natural gas transmission piping applied by SAW at shop and by GTAW-SMAW at site. The results can be summarized as follows; 1) Tensile strength of the welded zone by SAW(611.5 MPa) and by GTAW-SMAW(608.6 MPa) was maintained greater than that of the base metal(583.5 MPa). 2) Hardness of the welded zone and HAZ by SAW(Hv 194.8) & GTAW-SMAW (Hv 196.1) was slightly increased above that of the base metal (Hv 168.8), but less than the maximum allowable hardness(Hv 248). 3) Impact value of the welded zone by SAW(126.8 J) & GTAW-SMAW(88 J) became lower than that of the base metal(282.5 J), but was above the requirement of API 5L(68J). 4) Microscopic structure of the welded zone and HAZ by both SAW & GTAW-SMAW became fine-grained.
Keywords
- TMCP;
- Fine grained;
- API;
- SAW;
- GTAW;
- SMAW;
- HAZ;
- High Strength Steelpipe
- 미세결정립;
- 미국석유협회;
- 서브머지드 아크용접;
- 가스텅스텐 아크용접;
- 피복 아크용접;
- 열영향부;
- 고장력 강관;