Hello,
  I have a question I can't seem to find the answer to in AWS D1.1:2010:
     When qualifying Tandem SAW DC with an AC trailer do you have to keep the DC and AC paired up as qualified or can you use the DC settings from one weld pass and the AC settings from a different pass? This will probably depend on whether the second filler metal (AC) enters the weld pool or if the leading pool is already solidified, so second question--How do you determine this?