Yes, the "off load" check of welding voltages means trigger pressed but not welding ( known as the Open Circuit Voltage OCV ).
To get an accurate reading of the voltage across the arc during welding is difficult. Ideally, use a Digital Storage Oscilloscope ( DSO ) board with a slow timebase that connects by USB to a PC and could record for 10 or 20 seconds.
To measure current when welding you would need a DC-capable clamp-on meter, on one wire of the DC output circuit ( e.g. the work return cable ). The meter has to have a Hall-effect device in addition to the pincer-type AC pickup transformer. A "Max Hold" function is nice too, so you can check the reading after welding.
Your open-circuit voltages are very high - about twice what I would expect, and the drop when actually welding is also large ( especially for a 3-phase machine where three secondary windings are sharing the current load ).
I have no experience of taking MIG inductors out of the circuit, they are just "there", and I don't have large welders that offer a choice of inductor taps. I would have said that a "machine-gun" effect is caused by voltage that is too high or wirespeed that is too low. Often wirespeed is turned up until the wire is pushing the torch back from the workpiece, then down a little from that.
Another thread about a homemade inductor - this time using the core of a microwave oven transformer ( "MOT" ), and winding it with 16mm2 welding cable:
To get an accurate reading of the voltage across the arc during welding is difficult. Ideally, use a Digital Storage Oscilloscope ( DSO ) board with a slow timebase that connects by USB to a PC and could record for 10 or 20 seconds.
To measure current when welding you would need a DC-capable clamp-on meter, on one wire of the DC output circuit ( e.g. the work return cable ). The meter has to have a Hall-effect device in addition to the pincer-type AC pickup transformer. A "Max Hold" function is nice too, so you can check the reading after welding.
Your open-circuit voltages are very high - about twice what I would expect, and the drop when actually welding is also large ( especially for a 3-phase machine where three secondary windings are sharing the current load ).
I have no experience of taking MIG inductors out of the circuit, they are just "there", and I don't have large welders that offer a choice of inductor taps. I would have said that a "machine-gun" effect is caused by voltage that is too high or wirespeed that is too low. Often wirespeed is turned up until the wire is pushing the torch back from the workpiece, then down a little from that.
Another thread about a homemade inductor - this time using the core of a microwave oven transformer ( "MOT" ), and winding it with 16mm2 welding cable:
Two SIP T100P's (T90P)
Hi, first post here and firsty thanks for the great forum. I have learnt a heap from the threads here. I may be a glutten for punishment or just plain stupid but I just won two SIP T100P's (T90P) on eBay for a song. They are "new" but each with a different fault (so the seller said), one does...
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