Flux Cored

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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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3 pack 63 37 Tin Lead Rosin Core Flux 06mm Diameter Soldering Solder Wire 9g
3 pack 63 37 Tin Lead Rosin Core Flux 06mm Diameter Soldering Solder Wire 9g
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10mm Soldering Wire 60 40 Tin Resin Flux Rosin Core Solder Dispenser Tube CYC
10mm Soldering Wire 60 40 Tin Resin Flux Rosin Core Solder Dispenser Tube CYC
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Kester 24 6337 0010 44 Flux Core Solder 020 dia 1 lb Sn63 Pb37
Kester 24 6337 0010 44 Flux Core Solder 020 dia 1 lb Sn63 Pb37
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NOS Kester Printed Circuit Solder PC Board 60 40 44 Resin Flux Core 10 1oz
NOS Kester Printed Circuit Solder PC Board 60 40 44 Resin Flux Core 10 1oz
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250g 1mm Tin Lead Rosin Core Flux Solder Soldering Welding Iron Wire Reel
250g 1mm Tin Lead Rosin Core Flux Solder Soldering Welding Iron Wire Reel
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05mm Tin lead Solder Wire Rosin Core Soldering 2 Flux Reel Tube 60 40
05mm Tin lead Solder Wire Rosin Core Soldering 2 Flux Reel Tube 60 40
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10 rolls Forney 42300 E71T GS 2 lb 030 Flux Core Mild Steel Mig Welding Wire
10 rolls Forney 42300 E71T GS 2 lb 030 Flux Core Mild Steel Mig Welding Wire
$174.89
5 rolls Forney 42300 E71T GS 2 lb 030 Flux Core Mild Steel MIG Welding Wire
5 rolls Forney 42300 E71T GS 2 lb 030 Flux Core Mild Steel MIG Welding Wire
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2 rolls Forney 42300 E71T GS 2 lb 030 Flux Core Mild Steel Mig Welding Wire
2 rolls Forney 42300 E71T GS 2 lb 030 Flux Core Mild Steel Mig Welding Wire
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Forney 42300 E71T GS 2 lb 030 Flux Core Mild Steel MIG Welding Wire
Forney 42300 E71T GS 2 lb 030 Flux Core Mild Steel MIG Welding Wire
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Solder Alambre De Plomo De Estano Rosin Core Flux Iron Welding Tool 63 37 0031
Solder Alambre De Plomo De Estano Rosin Core Flux Iron Welding Tool 63 37 0031
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1mm 500g 60 40 Rosin Core Solder Tin Lead 20 Flux Soldering Welding Iron
1mm 500g 60 40 Rosin Core Solder Tin Lead 20 Flux Soldering Welding Iron
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Inner Shield Nr 211 Flux core Welding Wire 035 Lincoln ED030584
Inner Shield Nr 211 Flux core Welding Wire 035 Lincoln ED030584
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Arrival Tin 08mm 75g Rosin Core Tin Lead Free Rosin Roll Flux Reel Lea
Arrival Tin 08mm 75g Rosin Core Tin Lead Free Rosin Roll Flux Reel Lea
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15mm 200G 63 37 Rosin Core Flux 18 Tin Lead Roll Solder Wire
15mm 200G 63 37 Rosin Core Flux 18 Tin Lead Roll Solder Wire
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Tin Lead Solder Core Flux Soldering Welding Wire Spool Reel 08mm 63 37 HP
Tin Lead Solder Core Flux Soldering Welding Wire Spool Reel 08mm 63 37 HP
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Welding Wire Blue Demon 309LFC O 045 25LB Spool Stainless Steel Flux Core Wire
Welding Wire Blue Demon 309LFC O 045 25LB Spool Stainless Steel Flux Core Wire
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11 LBS 035 E71T 11 Flux Cored Welding Wire Washington Alloy
11 LBS 035 E71T 11 Flux Cored Welding Wire Washington Alloy
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03mm 40G 60 40 Rosin Core Flux 12 Tin Lead Roll Soldering Solder Wire
03mm 40G 60 40 Rosin Core Flux 12 Tin Lead Roll Soldering Solder Wire
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Hobart H222106 R19 2 Pound E71T 11 Carbon Steel Flux Cored Welding Wire 0030
Hobart H222106 R19 2 Pound E71T 11 Carbon Steel Flux Cored Welding Wire 0030
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4300 Amtech Solder Wire SN63 PB37 Tin Lead 015 22 Flux Core 13oz Partial
4300 Amtech Solder Wire SN63 PB37 Tin Lead 015 22 Flux Core 13oz Partial
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4300 Amtech Solder Wire SN63 PB37 Tin Lead 015 22 Flux Core 14oz Partial
4300 Amtech Solder Wire SN63 PB37 Tin Lead 015 22 Flux Core 14oz Partial
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4300 Amtech Solder Wire SN63 PB37 Tin Lead 015 22 Flux Core 15oz Partial
4300 Amtech Solder Wire SN63 PB37 Tin Lead 015 22 Flux Core 15oz Partial
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Century Wire Feed Welder Gun Flux Core Machine Portable Lightweight 90 Amp 120V
Century Wire Feed Welder Gun Flux Core Machine Portable Lightweight 90 Amp 120V
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195 AMP DUAL MIG 195 230V Flux Core Auto Wire Welding Machine Gas No Gas Welder
195 AMP DUAL MIG 195 230V Flux Core Auto Wire Welding Machine Gas No Gas Welder
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10 of Kester Solder 031 60 40 Rosin Core 66 44 Flux 24 6040 0027 Buy2Get1FREE
10 of Kester Solder 031 60 40 Rosin Core 66 44 Flux 24 6040 0027 Buy2Get1FREE
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Lotos MIG140 140 Amp MIG Wire Welder Flux Core Welder and Aluminum Gas Shielded
Lotos MIG140 140 Amp MIG Wire Welder Flux Core Welder and Aluminum Gas Shielded
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100g 08mm 60 40 Tin lead Solder Wire Rosin Core Soldering 2 Flux Reel Tube
100g 08mm 60 40 Tin lead Solder Wire Rosin Core Soldering 2 Flux Reel Tube
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1PC 100g 08mm 60 40 Tin lead Solder Wire Rosin Core Soldering Flux Reel TubeTS
1PC 100g 08mm 60 40 Tin lead Solder Wire Rosin Core Soldering Flux Reel TubeTS
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4lbs Flux Core E71T GS Gasless Welding Wire 030 Diameter 2 2 lb Rolls
4lbs Flux Core E71T GS Gasless Welding Wire 030 Diameter 2 2 lb Rolls
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DMiotech 04mm 400G 63 37 Rosin Core Flux 18 Tin Lead Roll Soldering Wire
DMiotech 04mm 400G 63 37 Rosin Core Flux 18 Tin Lead Roll Soldering Wire
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New Spool Reel FLUX 20 Tin Lead Line Soldering Iron Rosin Core Welding Wires
New Spool Reel FLUX 20 Tin Lead Line Soldering Iron Rosin Core Welding Wires
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Lincoln Electric Weld Pak 125 HD Flux Cored Welder Local Pickup Only
Lincoln Electric Weld Pak 125 HD Flux Cored Welder Local Pickup Only
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Forney Easy Weld 299 125FC Flux Core Welder 120 Volt 125 Amp
Forney Easy Weld 299 125FC Flux Core Welder 120 Volt 125 Amp
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Metal Man MFCN2PK Flux Core Nozzle Black Pack of 2
Metal Man MFCN2PK Flux Core Nozzle Black Pack of 2
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10mm Soldering Wire 60 40 Tin Resin Flux Rosin Core Solder Dispenser Tube TEU
10mm Soldering Wire 60 40 Tin Resin Flux Rosin Core Solder Dispenser Tube TEU
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KESTER 24 6337 0027 WIRE SOLDER 031 RA ROSIN SN63 PB37 66 FLUX 44 CORE 1 lb NEW
KESTER 24 6337 0027 WIRE SOLDER 031 RA ROSIN SN63 PB37 66 FLUX 44 CORE 1 lb NEW
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10x 08mm 63 37 11g Tin Lead Rosin Core Solder Solder Welding Wire FLUX 20 BS1
10x 08mm 63 37 11g Tin Lead Rosin Core Solder Solder Welding Wire FLUX 20 BS1
$4.45
1x 08mm 63 37 11g Tin Lead Rosin Core Solder Wire Tube Soldering Flux 20 BS1
1x 08mm 63 37 11g Tin Lead Rosin Core Solder Wire Tube Soldering Flux 20 BS1
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