Pictures -- My TIG inverter plugged into the actual welder
DC + -------------------------------+-------|
\ \/ Diode
R / --
BRIDGE \-------|
---
--- Cap
DC - ---------------------------------|
The short duration spike is, I think, due to reasons that you
mentioned (short condition being abruptly terminated). Now, that the
spike is not fully clamped, is, I hope, due to the snubber diode not
being fast enough (slow recovery).
Put a capacitor in parallel with the diode?
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