Lincoln Mig

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Why does flux core MIG require negative polarity?

We have a small Lincoln MIG machine at work and are doing a project using thicker material that the machine recommends using a Inner Sheild set-up for. We got the wire, tip and nozzle required for the set-up. I was just curious why Inner Sheild welding requires changing the machine to negative polarity vs positive polarity for Outer-Shield.

More penetration. The "heat" is going into the part. Electrode positive is for sheet metal (less penetration).

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LINCOLN ELECTRIC CO Compressed Gas Regulator Model 1599 Brass for Mig Welder
LINCOLN ELECTRIC CO Compressed Gas Regulator Model 1599 Brass for Mig Welder
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Lincoln Electric Welders K2697 1 Easy Mig 140 120 Volt AC Compact Wire Welder
Lincoln Electric Welders K2697 1 Easy Mig 140 120 Volt AC Compact Wire Welder
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LINCOLN ELECTRIC ED028636 Super Glide S6 MIG Bare Carbon Steel Welding Wire 045
LINCOLN ELECTRIC ED028636 Super Glide S6 MIG Bare Carbon Steel Welding Wire 045
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MIG Welding WireNR 211 MP035Spool LINCOLN ELECTRIC ED030584
MIG Welding WireNR 211 MP035Spool LINCOLN ELECTRIC ED030584
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Lincoln Electric Welder Handy MIG Welder Wire Feed Welding Machine 20 Amp 115v
Lincoln Electric Welder Handy MIG Welder Wire Feed Welding Machine 20 Amp 115v
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MIG Welding Wire NR 211 MP035 Spool Lincoln Electric Used 1 LB About 95 full
MIG Welding Wire NR 211 MP035 Spool Lincoln Electric Used 1 LB About 95 full
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Lincoln Magnum 100L K530 6 Replacement MIG Welding Gun Torch 100 Amp 10FT
Lincoln Magnum 100L K530 6 Replacement MIG Welding Gun Torch 100 Amp 10FT
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Lincoln Electric Welder Feed Wire 035 Mig SuperArc L 56 Welding Spool Tool New
Lincoln Electric Welder Feed Wire 035 Mig SuperArc L 56 Welding Spool Tool New
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Lincoln Electric Welder Machine 140 Amp MIG Wire Feed 2 Knob Tapped Control
Lincoln Electric Welder Machine 140 Amp MIG Wire Feed 2 Knob Tapped Control
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MIG WELDING GUN TORCH 15 250AMP replacement for LINCOLN Magnum 250LPower MIG
MIG WELDING GUN TORCH 15 250AMP replacement for LINCOLN Magnum 250LPower MIG
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MIG WELDING GUN TORCH 12 250AMP replacement for LINCOLN Magnum 250LPower MIG
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MIG WELDING GUN TORCH 10 250AMP replacement for LINCOLN Magnum 250LPower MIG
MIG WELDING GUN TORCH 10 250AMP replacement for LINCOLN Magnum 250LPower MIG
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RARE WELDING EXTENSION MIRROR TELESCOPING 34 LINCOLN MILLER HOBART MIG TIG STIC
RARE WELDING EXTENSION MIRROR TELESCOPING 34 LINCOLN MILLER HOBART MIG TIG STIC
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Lincoln Electric MIG Conversion Kit with 1 4 in Regulator with Gauge
Lincoln Electric MIG Conversion Kit with 1 4 in Regulator with Gauge
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HD Lincoln Steel Amp Welder Machine Mig Welding Electric Feed Wire Flux Weld Pak
HD Lincoln Steel Amp Welder Machine Mig Welding Electric Feed Wire Flux Weld Pak
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MIG Welder Cover Waterproof Red for Lincoln MIG Welder Power Mig 351523cm
MIG Welder Cover Waterproof Red for Lincoln MIG Welder Power Mig 351523cm
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Lincoln Power MIG 210 MP Multi Process Welder MIG TIG and Stick K3963 1
Lincoln Power MIG 210 MP Multi Process Welder MIG TIG and Stick K3963 1
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5 ea Genuine Tweco 22 62 5 8 Mig Welding Nozzles Fits Tweco 2
5 ea Genuine Tweco 22 62 5 8 Mig Welding Nozzles Fits Tweco 2
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2 ea Genuine Tweco 22 62 5 8 Mig Welding Nozzles Fits Tweco 2
2 ea Genuine Tweco 22 62 5 8 Mig Welding Nozzles Fits Tweco 2
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Lincoln Electric LN 25 Wire Feeder LN25 MIG Welder Suitcase
Lincoln Electric LN 25 Wire Feeder LN25 MIG Welder Suitcase
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Masterweld MASTERWELD LINCOLN MINI 10 Magnum 100L MIG Gun Replacement 150A
Masterweld MASTERWELD LINCOLN MINI 10 Magnum 100L MIG Gun Replacement 150A
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LINCOLN SUREARC 035 2LB SPOOL MIG WIRE ER70S 6 ED030606 ED030632
LINCOLN SUREARC 035 2LB SPOOL MIG WIRE ER70S 6 ED030606 ED030632
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10 pack of Contact Tips 11 23 Tweco Style  Lincoln Magnum 100L MIG Gun
10 pack of Contact Tips 11 23 Tweco Style Lincoln Magnum 100L MIG Gun
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25 pack of Contact Tips 11 23 Tweco Style Lincoln Magnum 100L MIG Gun
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10 pack of Contact Tips 11 30 Tweco Style Lincoln Magnum 100L MIG Gun
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25 pack of Contact Tips 11 30 Tweco Style  Lincoln Magnum 100L MIG Gun
25 pack of Contact Tips 11 30 Tweco Style Lincoln Magnum 100L MIG Gun
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10 pack of Contact Tips 11 35 Tweco Style  Lincoln Magnum 100L MIG Gun
10 pack of Contact Tips 11 35 Tweco Style Lincoln Magnum 100L MIG Gun
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10 pack of Contact Tips 11 45 Tweco Style  Lincoln Magnum 100L MIG Gun
10 pack of Contact Tips 11 45 Tweco Style Lincoln Magnum 100L MIG Gun
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25 pack of Contact Tips 11 45 Tweco Style  Lincoln Magnum 100L MIG Gun
25 pack of Contact Tips 11 45 Tweco Style Lincoln Magnum 100L MIG Gun
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LINCOLN IDEALARC DC 400 AMP MIG WELDER WITH LN7 WIRE FEEDER AND CART
LINCOLN IDEALARC DC 400 AMP MIG WELDER WITH LN7 WIRE FEEDER AND CART
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LINCOLN IDEALARC RS3 400 MIG ARC WELDER 400 AMP WITH LN7 WIRE FEEDER
LINCOLN IDEALARC RS3 400 MIG ARC WELDER 400 AMP WITH LN7 WIRE FEEDER
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Tweco WeldSkill 400 Amp MIG Gun 15 FT Fits Lincoln Back end
Tweco WeldSkill 400 Amp MIG Gun 15 FT Fits Lincoln Back end
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Lincoln Electric Matador MIG Welding Steel Pliers Rubber Coated Ergonomic Handle
Lincoln Electric Matador MIG Welding Steel Pliers Rubber Coated Ergonomic Handle
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Lincoln Electric Power Mig 216 Welder
Lincoln Electric Power Mig 216 Welder
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Lincoln LA 100 1 16 125 lbs mig welding wire NEW FREE SHIPPING
Lincoln LA 100 1 16 125 lbs mig welding wire NEW FREE SHIPPING
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Tweco Lincoln Mig Gun Direct Plug
Tweco Lincoln Mig Gun Direct Plug
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Liner 42 3035 15 030 035 15 ft for Tweco 1 2  Lincoln 200A MIG Welding Gun
Liner 42 3035 15 030 035 15 ft for Tweco 1 2 Lincoln 200A MIG Welding Gun
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Lincoln KP1929 1 45 Tube Assembly For 400 Amp Magnum 200 400 MIG Gun
Lincoln KP1929 1 45 Tube Assembly For 400 Amp Magnum 200 400 MIG Gun
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HTP Liner compatible with Lincoln Handy Core Weld Mig Pak HD Mig Welder Parts
HTP Liner compatible with Lincoln Handy Core Weld Mig Pak HD Mig Welder Parts
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