Mig Gun

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What would cause Mig Welding gun nozzle to ground out or arc against work piece?

I bought a new miller welder and the Mig Gun Nozzle grounds out and arcs when it touches the work piece. I'm running solid wire with shielding gas and the polarity is set up correctly. Almost seems like an insulator is failing.

Do you have a warranty?

First thing to do is to take the nozzle off and clean it. There might be spatter inside that's shorting between the gas diffuser and the nozzle.

Otherwise, the insulator is bad and needs to be replaced.

Some MIG machines have a separate insulator and nozzle, newer ones have the nozzle + insulator as one piece. Should be able to get new ones at any local welding supply store. Or, order the parts online.

Does it do this all the time, or only when you're pressing the trigger? If it happens even when you're not holding the trigger, then you may also have a bad contactor.

Discover Mig Gun On eBay Below:

LOT OF 5 MILLER ELECTRIC 169728 PRS169728 HEAVY DUTY GAS DIFFUSER
LOT OF 5 MILLER ELECTRIC 169728 PRS169728 HEAVY DUTY GAS DIFFUSER
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Abicor Binzel 1229086 Liner Steel 078 092 17 SPL B Mig Gun Part NEW
Abicor Binzel 1229086 Liner Steel 078 092 17 SPL B Mig Gun Part NEW
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23 PCS Panasonic Type P350 MIG MAG Welding Air cooled Torch TIP 09mm Nozzle
23 PCS Panasonic Type P350 MIG MAG Welding Air cooled Torch TIP 09mm Nozzle
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2 Abicor Binzel 1229086 Liner Steel 078 092 17 SPL B Mig Gun Part NEW
2 Abicor Binzel 1229086 Liner Steel 078 092 17 SPL B Mig Gun Part NEW
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10 PCS Panasonic Type MIG MAG Welding Industrial Robot Contact TIP 06mm 0023
10 PCS Panasonic Type MIG MAG Welding Industrial Robot Contact TIP 06mm 0023
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10 PCS Panasonic Type MIG MAG Welding Industrial Robot Contact TIP 08mm 0030
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WeldingCity 2 Nozzles 23 75 3 4 for Tweco Lincoln 200 400A MIG Welding Guns
WeldingCity 2 Nozzles 23 75 3 4 for Tweco Lincoln 200 400A MIG Welding Guns
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10 PCS Panasonic Type MIG MAG Welding Industrial Robot Contact TIP 09mm 0035
10 PCS Panasonic Type MIG MAG Welding Industrial Robot Contact TIP 09mm 0035
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10 PCS Panasonic Type MIG MAG Welding Industrial Robot Contact TIP 10mm 0040
10 PCS Panasonic Type MIG MAG Welding Industrial Robot Contact TIP 10mm 0040
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10 PCS Panasonic Type MIG MAG Welding Industrial Robot Contact TIP 16mm 1 16
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21 PCS Panasonic Type P200 MIG MAG Welding Air cooled Torch TIP 09 Nozzle
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50 Direct Fit RSG250 Spool Gun f Miller Trailblazer
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Miller M 10 15 25 MIG gun Trigger Replacement 227798
Miller M 10 15 25 MIG gun Trigger Replacement 227798
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Panasonic MIG Welding PTFE Liner 10 12 Welding Wire Connectors 53M 174ft
Panasonic MIG Welding PTFE Liner 10 12 Welding Wire Connectors 53M 174ft
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Panasonic MIG Welding PTFE Liner 06 09 Welding Wire Connectors 43M 141ft
Panasonic MIG Welding PTFE Liner 06 09 Welding Wire Connectors 43M 141ft
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Miller 000067 030 Contact Tips for M Series Guns 10 pack
Miller 000067 030 Contact Tips for M Series Guns 10 pack
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Panasonic MIG Welding PTFE Liner 06 09 Welding Wire Connectors 33M 108ft
Panasonic MIG Welding PTFE Liner 06 09 Welding Wire Connectors 33M 108ft
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Miller 169724 NOZZLESLIP TYPE 500 ORF 125RECESS
Miller 169724 NOZZLESLIP TYPE 500 ORF 125RECESS
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Miller Kit DR Roll 047 Control
Miller Kit DR Roll 047 Control
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Miller 169726 NOZZLESLIP TYPE 625 ORF FLUSH
Miller 169726 NOZZLESLIP TYPE 625 ORF FLUSH
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WeldMark by Tweco WMK40103545L MIG Gun
WeldMark by Tweco WMK40103545L MIG Gun
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Genuine BERNARD 1589 035 Contact Tips 10 Pack MIG Welding FAST FREE SHIP
Genuine BERNARD 1589 035 Contact Tips 10 Pack MIG Welding FAST FREE SHIP
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Miller 182948 Idler Roll Assembly
Miller 182948 Idler Roll Assembly
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AMERICAN WELDQUIP INC WELDING GUN 300ROBO WELDQUIP
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Contact Tip Holder for Electric Mig Gun Torch Parts Mig Welder Replacement
Contact Tip Holder for Electric Mig Gun Torch Parts Mig Welder Replacement
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Genuine BERNARD T 045 045 Centerfire Contact Tips 10 Pack FAST FREE SHIP
Genuine BERNARD T 045 045 Centerfire Contact Tips 10 Pack FAST FREE SHIP
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PROFAX 10X10 MANIPULATOR W LINCOLN SUBARC
PROFAX 10X10 MANIPULATOR W LINCOLN SUBARC
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YS 50 Style Mig Welding Pliers
YS 50 Style Mig Welding Pliers
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Tweco TWE 42 4045 15 MIG Gun Liner 15 Ft 035 045
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Gas Nozzle 4491 3 4 for Bernard MIG Welding Gun Torch PK2
Gas Nozzle 4491 3 4 for Bernard MIG Welding Gun Torch PK2
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25 pack of Contact Tips 11 45 Tweco Style  Lincoln Magnum 100L MIG Gun
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D F MACHINE SPECIALTIES 47408 CW T 35DEG WATER COOLED CURVED WELDING GUN 18BV
D F MACHINE SPECIALTIES 47408 CW T 35DEG WATER COOLED CURVED WELDING GUN 18BV
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Tregaskiss Toughgun 405 180QC Mig Welder Goose Neck New
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TWECO 104 FRONT REAR CONNECTOR BLOCK FOR MIG GUNS NEW 186790
TWECO 104 FRONT REAR CONNECTOR BLOCK FOR MIG GUNS NEW 186790
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European style MIG MAG Graphite Liner 10 16 Welding Wire 33M 108ft
European style MIG MAG Graphite Liner 10 16 Welding Wire 33M 108ft
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WeldingCity 25 pk Contact Tip 7488 0030 for Bernard MIG Welding Gun
WeldingCity 25 pk Contact Tip 7488 0030 for Bernard MIG Welding Gun
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2 pk WeldingCity MIG Welding Gun 100A 10 ft Replacement Hobart H 10 195957
2 pk WeldingCity MIG Welding Gun 100A 10 ft Replacement Hobart H 10 195957
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Bernard N 5814C Nozzle 5 8 For BTB Platform MIG Guns PN N 5814C
Bernard N 5814C Nozzle 5 8 For BTB Platform MIG Guns PN N 5814C
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Tweco 45 18 15 Welder Mig Gun Liner Conduit
Tweco 45 18 15 Welder Mig Gun Liner Conduit
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