Usually TIG welding is used for root/hot pass and SMAW for filling /capping of pipe welding especially class 1 piping. I am exploring the use of MIG process for increasing the production rate. Can some one advise on what shielding gas I should be using for SS 304L and SS 316 L piping . Various sources give different mixtures ranging from pure argon to 25% Co2 and 75% Argon,and 2% O2 in argon. What are the relatative merits demerits of these mixture. Which one should be used for high quality pipe work (X-ray inspection)
FH