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| Cause Analysis of Flange Weld Defects |
| Received:March 29, 2017 Revised:July 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.07.019 |
| KeyWord:flange lack of interlayer fusion cracking |
| Author | Institution |
| ZHANG Xiang |
CNPC Tubular Goods Research Institute, Xi'an , China |
| CAI Ke |
CNPC Tubular Goods Research Institute, Xi'an , China |
| CHEN Zhi-xin |
CNPC Tubular Goods Research Institute, Xi'an , China |
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| Abstract: |
| Objective To research causes of flange girth weld defects, and take corresponding specific measures to prevent leakage accidents. Methods The cracking reason was analyzed by the means of macro examination, ultrasonic inspection and measurement, chemical composition analysis, OM and EDS. Results The crack was initiated between the root welding materials and the base metal and propagated along the circumferential direction of weld. Both ends of the cracking were smooth. The residual welding coating in root welding and lack of interlayer fusion were the internal reason for cracking. Conclusion The crack is caused by improper control of welding parameters. |
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