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Contact tips, nozzles, diffusers and liners for a mid-size MIG torch: how to pick the right ones and keep them working.
Work from the quickest checks to the longest. If the drive rolls turn but the wire does not move, look at the drive rolls first: they should be the right type for the wire, not worn, and set to the right tension, because too little pressure can stop the wire feeding. Then check the contact tip for a blockage or debris and replace it if needed.Check the liner last, as it takes longer to inspect and replace. Look for kinks, wear, debris, the wrong size, or gaps where it was poorly trimmed. Also make sure the wire is clean and not tangled on the spool. If the drive rolls do not turn at all, follow the troubleshooting section of your machine manual.
Yes. The bore should suit the wire diameter you are running, as the tip's job is to pass welding current into the wire. A wrong-size tip is a common reason for short tip life. A bore that is too large can let the wire wander and arc inside the tip, and one that is too small can make the wire bind and feed badly.Tips for different wire diameters are usually marked or listed by wire size, so check the marking and the manual for your torch. Changing wire size normally means changing the tip, and often the liner and drive rolls too.
Choose the nozzle shape and bore that your torch is designed for, and check the manual for the ones that fit. In general a larger bore gives better gas cover and suits higher current, while a tapered or shorter shape gives better access in tight joints.Spatter that blocks the nozzle or diffuser can restrict the shielding gas flow and lead to spatter and porosity, so clean or replace a nozzle that is clogged, damaged or out of round. Clean it with a brush or tool made for the job rather than pliers, files or hammering, which can damage the nozzle and the parts inside.
Not necessarily. Too little shielding gas leaves the weld exposed to air and can cause porosity and spatter. But very high flow can also be a problem, because it can create turbulence that draws air into the shield and causes porosity of its own.Check the flow against the guidance for your wire and gas, then look for blocked nozzles or diffuser holes, damaged O-rings or hoses, and draughts. If the problem remains, ask your gas supplier or the maker for advice.
