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abayomi-zaccheaus-6976384
Question added by ABAYOMI ZACCHEAUS, QA/QC MANAGER, BAYWOOD DEXTRONVENTURE CONTRACTOR TO CHEVRON NIG. LTD. - 9 years ago

In SMAW Welding of Crude storage Tank, Why do we Change the Polarity of the Welding M/C to -ve during root and hot pass and return to +ve later?

Welding

QC

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