Study for West-East gas pipeline shows safety benefits of overmatched girth welds

Welding tests in advance of construction of China's West-East Pipeline indicated that an overmatch between a girth weld and line pipe metal would improve limit load properties and strengthen fracture resistance of the line pipe.But the tests also indicated the danger that the increased weld strength might undermine its resistance to hydrogen-induced cracking (HIC) and stress corrosion cracking (SCC), making the weld operation more difficult.If the ratio between weld and pipe metal strengths is not too large, however, the tests showed that an overmatched weld provided desirable qualities.The tests were performed by the Welding Technology Center of the Pipeline Bureau of China National ...

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