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Straight answers to common questions about choosing, setting up and looking after a heavy-duty water-cooled MIG torch with interchangeable necks.
Choose the shortest cable that still lets you reach the work comfortably. A longer cable gives more freedom, but it also gives the wire more friction to overcome and more chance of kinks and tight coils, which leads to feeding problems and faster wear of the cable and liner.If you need to work a long way from the wire feeder, it is often better to move the feeder closer to the job than to fit a very long torch. Think about the biggest area you will cover from one feeder position, then pick the shortest length that covers it.
The contact tip, gas diffuser and nozzle take the heat and the spatter, so they wear first. A contact tip whose hole has worn oval, or is the wrong size for the wire, causes erratic feeding and the wire burning back into the tip. Spatter building up inside the nozzle upsets the gas shield.There is no fixed interval, because wear depends on current, arc-on time, wire and joint. Replace the tip when the arc or the wire feed becomes unstable, clean or replace the nozzle when spatter builds up, and check that the tip, diffuser and nozzle are still tight, as they can loosen with heat.
Poor feeding is very often down to the liner. A liner that has been trimmed too long or too short, is clogged with dirt and swarf, or is the wrong size for the wire can cause chattering feed, a ragged arc, burn-back and the wire tangling at the drive rolls (bird-nesting).When fitting a new liner, follow the maker's instructions on trimming it to length, ideally with the cable laid out straight, and use the right size for your wire. Also check the contact tip size and wear, the drive roll pressure and any sharp bends in the cable before blaming the wire itself.
Keep the cable as straight as you can while welding and avoid kinks and tight coils, which restrict wire feed and gas flow. Do not pull on the cable to drag the feeder or a cart around, as this strains the connections.Inspect the cable and hoses regularly for cuts, kinks and damage. Store the torch off the floor, ideally hung by the handle with the neck pointing up, away from dirt and damp, because moisture can corrode parts of the liner and connections. Make sure all connections are tight, since a loose connection causes heat and wear.
