ER70S-6 is one of the most popular solid wire filler metals for GMAW and GTAW yet it may not comply with the ASME A-No. 1 chemistry limitations for Manganese and Silica. It is important for those deploying ASME welding procedures with ER70S-6 filler metal listed as A-No. 1 to have procurement controls in place to monitor the Manganese and Silica values on the filler metal MTR.