Essential Variables — Automatic
Welding
(a) A change from automatic to machine welding.
(b) A change in the welding process.
(c) For electron beam and laser welding, the addition
or deletion of filler metal.
(d) For laser welding, a change in laser type (e.g., a
change from CO2 to YAG).
(e) For friction welding, a change from continous drive
to inertia welding or vice versa.
(f) For electron beam welding, a change from vacuum
to out-of-vacuum equipment, and vice versa.