Abstract
A narrow-gap GMAW procedure to join thick sections of structural and pressure vessels is described. Both carbon-manganese and chrome-moly low alloy steel procedures have been developed and qualified to ASME standards with the Alberta Boilers Branch. The narrow-gap process has been used with standard shielding gases based on argon and carbon dioxide and a new low oxidizing potential gas containing argon, carbon dioxide and hydrogen. Results with both gas types have been excellent. The GMAW process has significant advantages over the SAW process for narrow-gap welds in the areas of minimum number of passes required, ease of arc location, slag removal and weld metal mechanical properties.
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