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강교용 박스거더의 용접예열 온도 선정에 관한 연구

Title
강교용 박스거더의 용접예열 온도 선정에 관한 연구
Other Titles
Determination of Preheating Temperature for Box Girder Welding
Author
문승재
Keywords
box girder; carbon equivalent; preheating; welding crack
Issue Date
2011-03
Publisher
한국플랜트학회
Citation
플랜트저널, 2011, 7(1), P.49-55
Abstract
This study analyzed causes and status of cracks to suggest preventives for welding cracks generated on fillet welding zone of atmosphere corrosion resisting steel box girder. Penetrant testing, a sort of non-destructive testing, was conducted for inspection of crack status on welding zone. As a result of test, welding cracks were found on the point of start, center and end to fillet welding zone of 32 mm-thickness. The result of carbon equivalent composition of materials was 0.452%. According to welding specification, to preheat prevent welding crack, preheat temperature of $100{\sim}200^{\circ}C$ should be kept before welding execution. It was failed to keep preheat temperature because it had been executed on winter season and the structure of box girder had wide heat transfer area. As a result of examination of time varying preheating temperature of 32mm-thickness material, it was understood that preheat temperature of above $230^{\circ}C$ on both 130mm-long sides of welded joint can prevent welding crack.
URI
http://www.ndsl.kr/ndsl/search/detail/article/articleSearchResultDetail.do?cn=JAKO201117558397793&SITE=CLICK
ISSN
1739-7200; 1976-8702
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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