Just as a longshot: a belgian friend of mine has a mig welder

MH Weltronic systems /BIRMINGHAM Â* 5164 // Â*Tiger MK3 Â* (Tig Â*HF unit )
Mfd 1990 Â*. Â*

Which has blown some electronics, apparently the IC chips aren't
identifiable, the firm is out of business and he's looking for a circuit
diagram.

AJHÂ*