Ferm mig 100 handleiding

I got a HF MIG100 for free, and to my surprise (without autoshade hood) its 'scratch start".. I took both sides off of the machine and had a look see. The lead from the inverter goes straight to the MIG torch. Inverter mig/MMA welding machine. Model. 20.75. Actual output current (A). 100. 135. No-load voltage(V).