Welding issues with S22750 super duplex steel

2019-01-05View Original

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S32750 super duplex steel, 44mm X-shaped groove; GTAW welding is used for the root layer, SMAW welding for 2 layers, with the remaining parts welded by SAW. GTAW and SMAW welding present no problems, but cracks appear in the first layer of SAW welding. The welding material is Sandvik Welding Materials. Please give some advice.

Reply #22019-01-05

Judging from the situation in the image, it seems to be caused by an excessive welding current; the welding current can be reduced, or the welding speed can be increased. It is recommended to use a low current to increase the welding speed slightly.

Reply #32019-01-05

For duplex steel, it’s necessary to use a low current and submerged arc welding; our company has never used this method yet. Have weld assessments been carried out? Has it actually been done?

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Welding issues with S22750 super duplex steel

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