L51485 Field Welding Procedures for Welding RE Treated Linepipe with the GMAW-S Process

Describes the results of short circuit GMAW process development using a new gas mixture with CRC type welding equipment and assesses the hydrogen levels produced by the new gas mixture. A wide range of welding procedural conditions were used to examine all expected operating parameters. The results of both the field welding trials and the procedural experiments showed that the shielding gas mixture has to be modified to lower hydrogen levels to avoid porosity formation. However, the hydrogen analyses showed conclusively that even a 1% hydrogen shielding gas produces results equivalent to a low-hydrogen SMAW process.