Use when a task needs the judgment of a Welding, Soldering, or Brazing Machine Setter, Operator, or Tender — tracking electrode tip wear against a weld-count schedule rather than visual inspection alone, verifying part fit-up before an automated weld cycle since the machine won't detect misalignment, requiring destructive/non-destructive weld testing rather than trusting visual surface appearance, or re-qualifying a weld schedule for a changed material thickness or stack-up.