MIG Welding Gun Parts: Liners, Tips and Nozzles
Mig welding gun parts are the wear parts of the gun: contact tip, nozzle, gas diffuser and liner, with four kits for Lincoln Magnum 100L, Tweco Mini and MB15 guns.
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The arc stutters, the wire feeds rough, and the bead goes lumpy: on a small MIG gun the fault is often a worn consumable, not the welder. Mig welding gun parts are the wear parts of the gun: the contact tip, the nozzle and the gas diffuser at the front, and the liner that guides the wire from the feeder to the tip. This guide names each part, explains what it does, and shows four kits that cover the small MIG guns most home shops run.
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Below: what each gun part does, how to match parts to your gun, and four kits for Lincoln Magnum 100L, Tweco Mini and MB15 guns.
YESWELDER MIG Gun Accessories Kit
A 24-piece .030 in MIG gun kit with 20 contact tips, 2 nozzles and 2 gas diffusers for Lincoln Magnum 100L and Tweco Mini guns, in heat-resistant materials with a conical nozzle design.
Pros
- 20 contact tips, 2 nozzles and 2 gas diffusers in one kit
- Fits Lincoln Magnum 100L and Tweco Mini, plus 8 YESWELDER models
- Handles gasless and gas-shielded welding
- Conical nozzle surface focuses airflow
Cons
- Only .030 in tips; no .035 in option in this kit
- No liner is included
- No warranty term is stated
- No weight is stated
ARCCAPTAIN Lincoln Magnum 100L MIG Welding Gun Kit
A .035 in MIG gun kit with 20 pure copper contact tips, 2 copper nozzles and 2 gas diffusers for Lincoln Magnum 100L and Tweco Mini guns, built for spatter resistance.
Pros
- Pure copper contact tips for arc transfer
- Copper nozzles resist spatter adhesion
- 20 contact tips, 2 nozzles and 2 gas diffusers
- Fits Lincoln Magnum 100L and Tweco Mini, plus ARCCAPTAIN MIG250, MIG205PRO, MIG205MP, MIG250DP and MIG200P
Cons
- Only .035 in tips; no .030 in option in this kit
- No liner is included
- No warranty term is stated
- No weight is stated
ARCCAPTAIN MB15 15AK MIG Welding Gun Kit .030"
A .030 in MIG gun kit for MB15 torches with 20 contact tips, 2 gas diffusers and 2 gas nozzles, with nickel-plated nozzles over copper for spatter resistance.
Pros
- Nickel-plated nozzles for spatter resistance
- 20 contact tips, 2 diffusers and 2 nozzles
- Fits MB15 torches and 8 ARCCAPTAIN welders
- Contact tips stated for arc transfer
Cons
- Only fits MB15 torches; not for Lincoln Magnum 100L guns
- Only .030 in tips in this kit
- No liner is included
- No warranty term is stated
ZINGER Mig Welding Gun 0.030"Kit for Lincoln
A .030 in MIG gun kit with 20 contact tips 11-30, 2 gas nozzles 21-50 and 2 diffusers 35-50 for Lincoln Magnum 100L and Tweco Mini guns.
Pros
- 20 contact tips, 2 nozzles and 2 diffusers
- Fits Lincoln Magnum 100L and Tweco Mini guns
- Tip, nozzle and diffuser part numbers are listed
- 1/2 in nozzle size is stated
Cons
- Spec table lists a weight of 0.000625 lb, far too light for a kit of tips, nozzles and diffusers
- Only one bullet of description; no material is stated
- No liner is included
- No warranty term is stated
Mig welding gun parts: what each part does
A MIG gun feeds wire and shielding gas through a set of parts that wear out with use. The contact tip carries the welding current to the wire and sets the wire size: the kits here come in .030 in and .035 in. The nozzle shapes the shielding gas around the arc; the YESWELDER listing describes a conical nozzle surface that focuses airflow for cleaner welds. The gas diffuser sits behind the nozzle and spreads the gas evenly around the tip. The liner is the tube inside the gun that guides the wire from the feeder to the tip, and it wears where the wire rubs it.
| Part | What it does | When it wears |
|---|---|---|
| Contact tip | Carries current to the wire; sets the wire size | Arc grows rough or the wire sticks |
| Nozzle | Shapes shielding gas around the arc | Spatter builds up inside it |
| Gas diffuser | Spreads gas evenly around the tip | Gas flow turns uneven |
| Liner | Guides the wire from feeder to tip | Wire feeds rough or jams |
None of the four kits here includes a liner; each covers tips, nozzles and diffusers, the consumables at the front of the gun. Buy the liner separately and match it to your gun model.
Matching parts to your gun
Match the tip size to your wire first: .030 in tips for .030 in wire, and .035 in tips for .035 in wire. Then match the kit to the gun. The Lincoln Magnum 100L (K530 series) and Tweco Mini/#1 guns take the YESWELDER, Zinger and ARCCAPTAIN .035 in kits, while the MB15 torch takes the ARCCAPTAIN MB15 kit. The YESWELDER kit also lists YESWELDER welders as a direct fit, and the ARCCAPTAIN .035 in kit lists ARCCAPTAIN MIG250, MIG205PRO, MIG205MP, MIG250DP and MIG200P.
Check the gun model before you order. A kit that fits a Lincoln Magnum 100L gun will not fit an MB15 torch, and a .035 in tip makes poor contact with .030 in wire, so the arc runs erratically. The part numbers help here: the Zinger kit prints 11-30 tips, 21-50 nozzles and 35-50 diffusers, so single parts can be reordered by number.
The gear: kits for these guns
Each kit below covers the tips, nozzles and diffusers a gun needs, matched to the gun models named above.
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Keeping consumables in shape
Spatter is the enemy of nozzles and tips. The ARCCAPTAIN .035 in listing states its copper nozzles resist spatter adhesion, and the ARCCAPTAIN MB15 kit uses nickel-plated nozzles over copper for the same job. Keep spare tips on hand: a worn tip makes the arc rough long before the gun itself fails. Check the diffuser when gas flow turns uneven, and keep the nozzle clean so the shielding gas stays even around the arc.
FAQ: garage tools
What parts does a MIG welding gun have?
The wear parts of the gun are the contact tip, the nozzle and the gas diffuser at the front, and the liner that guides the wire from the feeder to the tip. The kits here cover tips, nozzles and diffusers; none includes a liner.
What size contact tip do I need?
Match the tip to your wire: .030 in tips for .030 in wire, and .035 in tips for .035 in wire. The YESWELDER, Zinger and ARCCAPTAIN MB15 kits here are .030 in, and the ARCCAPTAIN Lincoln kit is .035 in.
Do Lincoln Magnum 100L parts fit a Tweco Mini gun?
Yes, for the kits here: the YESWELDER, Zinger and ARCCAPTAIN .035 in kits are listed for Lincoln Magnum 100L (K530 series) and Tweco Mini/#1 guns. Check your gun model before you order, since MB15 torches take a different kit.
How many pieces come in a MIG gun kit?
The kits here each hold 20 contact tips, 2 nozzles and 2 gas diffusers. The YESWELDER listing states 24 pieces in all.
When should I change a contact tip?
Change it when the arc grows rough, the wire sticks, or the bead turns lumpy. A worn tip is the first thing to check when a gun that ran fine starts to misbehave.
Related: TIG welder set up for the other process in the shop, the welding cable size chart for matching cable to amperage, the best welding magnets for body panels, and leather welding gloves for the hands. The engine and shop equipment hub covers the rest of the shop.
