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97447 UNDER-DEPOSIT CORROSION AT WELD SEAMS IN CARBON STEEL PIPING

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Product Number: 51300-97447-SG
ISBN: 97447 1997 CP
Author: Andrew G. Howell
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In many cases, the seam of welded carbon steel piping corrodes preferentially to the base metal. There are many factors which contribute to the situation, including residual stresses and chemical composition, which may result in a welded region which is anodic to the adjacent base metal. One factor which can accelerate corrosion at weld seams is the presence of deposits over the seam. Where such deposits result in under-deposit corrosion, the weld seam can experience corrosion in the center of the seam, resulting in failure. However, this is not universally the case, and it is difficult to predict the likelihood or extent of corrosion at weld seams. Steps can be taken to reduce the likelihood of this form of corrosion. Keywords: Weld seam, under-deposit corrosion, electric-resistance welding
In many cases, the seam of welded carbon steel piping corrodes preferentially to the base metal. There are many factors which contribute to the situation, including residual stresses and chemical composition, which may result in a welded region which is anodic to the adjacent base metal. One factor which can accelerate corrosion at weld seams is the presence of deposits over the seam. Where such deposits result in under-deposit corrosion, the weld seam can experience corrosion in the center of the seam, resulting in failure. However, this is not universally the case, and it is difficult to predict the likelihood or extent of corrosion at weld seams. Steps can be taken to reduce the likelihood of this form of corrosion. Keywords: Weld seam, under-deposit corrosion, electric-resistance welding
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