Welding defects

2019-04-08View Original

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For low-temperature liquid carbon dioxide storage tanks, welding test plates are fabricated one by one; they are 12 mm thick. Welding is carried out automatically using submerged arc welding, with 10Mn2 wire used for the back side of the plate and root cleaning performed on the front side. ER55-Ni1 wire is used for manual root pass welding on the front side, followed by another pass there as well. After flaw detection, tests are conducted – the tensile strength and bending properties meet the requirements, but the low-temperature impact data do not. There are defects shown in the photos; please share your opinions on what could be causing them.

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Welding defects

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