Effect of welding parameters on the susceptibility to hydrogen cracking in line pipe steels in sour environments

Yavaş, Özgür
In this study, hydrogen induced cracking (HIC) behavior of welded steels used in petroleum lines under sour petroleum environments was investigated. The testing environment in NACE TM0284-2003 standard was used in order to simulate sour petroleum environment. In order to investigate behavior of welding parameters, used in pipe production, on HIC, welds were done with different line energies. Two different API X-65 steels were used in welding operations. The specimens taken from welded zones were tested in testing environment. The specimens were examined metallographically. Crack lengths were measured with a computer program. The results obtained were discussed in view of metallurgical and welding parameters aspects. The result obtained from this investigation led to a general conclusion that, the metallurgical parameters of steels used in pipe production were more important than welding parameters regarding their effect on HIC. It was shown that the composition and microstructural grain size of steels were in direct relation to HIC.


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Citation Formats
Ö. Yavaş, “Effect of welding parameters on the susceptibility to hydrogen cracking in line pipe steels in sour environments,” M.S. - Master of Science, Middle East Technical University, 2006.