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Re: Mig replace tip
Pull off the extreme outer nozzle of the MIG gun. Clean the inside of this nozzle with MIG pliers or round wire brush. Unscrew the welding tip. (If it is stuck, try using a pair of pliers lightly). Clean the entire area with a regular wire brush. Screw on the new tip finger tight, but snug. Replace the outer nozzle.
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You could pass voltage but no welding current if the current carrying cable inside the mig gun has a break in it. Inside the mig gun is a braided copper current passing cable, if it only has a few strands of wire to complete the circuit it will not pass weld current.They usually break where the mig gun has been flexed over time.
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.
your feeder may need adjusting or more commonly the tip has tacked itself on the edn cap
keep the line as straight as you can & keep feeder compartment clean!
keep plyers handy for when wire is stuck in the tip
if you need to replace wire spool or a brakage of the wire make sure the wire is free or BURRS b4 you put it in the tube or you will damage the tube!
Pull the shield off the end of the stinger, unscrew the brass tip off the end of the stinger, pull the trigger, just a second or two (to feed wire through. turning the tip, left and right, if it doesnt free from the wire, snip the wire and carefully file the damaged end and try to free it. If unsuccessful replace it with a new one. Not expensive.