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Re: Mig problem
For certain type of work TIG is required, like welding chrome moly for some racing organizations. Intricate work, like gunsmithing is also well suited to TIG. TIG is used by many auto restorers who prefer a more precise, perfect finish that requires little to no finish work. TIG is most similar to gas welding in technique, so if you've done oxy-fuel welding, TIG should be a natural transition.
MIG is required by law and by insurance companies in many localities for structural repair of automotive frames. MIG is also much easier to learn and faster to weld. For doing other types of welding, like sheet metal, it can be a matter of personal preference. For an auto body repair shop or a novice welder, a MIG is a good, practical all-around welder.
Depends on what u are welding there is mig , tig, arc thay are all for there own specilast things mig anyone can use i call it a hot glue gun i could teach you in a day not verry good for penertretion and not verry strong welds with hard wire but is verry fast and can weld km ,s in a day where a tig takes a while to weld small sections but doesnt put as much heat into the metal and is mainly used for alloy stainless specialized procedurs with a verry strong weld but can take you years to master
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They told me at welding school the mig transformer has a different slope (whatever that means?) to the tig and mma transformer so I am a little surprised at your question. The implication is two transformer are needed for the three types of welding and for tig and mig a dc converter and also for dc mma welding.
From your description it seems as though welding current is not arriving at the tip of the mig torch or the current is arriving in the wrong form.
You say the mma is fine but you didn't say whether it is fine on ac welding, dc welding or both. I have not tried mig welding with ac and have no idea whether it would be successful but I imagine a lot of sparks and not much welding. The problem could be the rectifier unit is either not working or is switched out of the circuit.
Polarity is important too with dc tig and mig welding.
I believe Air Products was bought by Miller. It was a long time ago and they have not put anything on their web site to support owners of AP weld equipment. Contact a local Miller sales and supplies store to see if you can get more information.
The Rossi 220bz mig welder comes set up to use gas welding, that is with the Mig electrode connected to the positive terminal, inside the machine.
To use gasless mig wleding, the mig wire must be disconnected from the positive terminal inside the machine and reconnected to the Negative terminal - inside the machine. Open both the side coveres of the welder using a phillips screwdriver. Use a 13mm spanner to undo the hex nut holding the thick copper Mig lead to the terminal named positive, then lead it through the machine to the terminal on the oppisite side of the machine, labelled negative and screw it in place there with a 13mm hex screw. Be carefull not to bump any of the many electric parts inside the machine.
If you run the Mig welder in gasless mode with positive earth and positive elecrode it will blow the household electric fuse.
If you run the Mig welder in gasless mode with negative earth and positive electrode it will work, but the end of the Mig gun tip will get very very hot and start smoking abnormally from excessive heat.
But if you take the side covers off and rewire it (takes about 10 minutes) to negative Mig Electrode, the Mig gun tip remains cool and does not overheat. You will have to cut just one white cable tie, to get an extra inch or so of free Mig cable, so the thick copper Mig lead will reach accross to the terminal on the other side of the machine named negative. Stick the earth lead at the front in the positive terminal.
I did this on my Rossi 220bz mig welder.
Both are different wielding methods used in metal fabrication service. Tungsten inert gas wielding or TIG is high quality arc wielding and is used for high quality wielding applications. Metal inert gas or MIG is another form of wielding.
Sounds like the problem could be with your tig torch. Inside the tig torch you have a copper cable which carries your main welding current. If there is a break in the copper the high frequency is of such a high tension voltage that it can jump across the break in cable making it appear that your tig torch is fine. If you have a multimeter check continuity from one end of the torch to the other or try another tig torch.