Hobart Welding Products 125 manual Common Gmaw MIG Shielding Gases, Application, Fillet

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9-17. Common GMAW (MIG) Shielding Gases

This is a general chart for common gases and where they are used. Many different combinations (mixtures) of shielding gases have been developed over the years. The most commonly used shielding gases are listed in the following table.

 

 

 

Application

 

 

 

 

 

 

 

 

 

Gas

Spray Arc Steel

Short Circuiting

Spray Arc

Short Circuiting

Spray Arc

Short Circuiting

 

Steel

Stainless Steel

Stainless Steel

Aluminum

Aluminum

 

 

 

 

 

 

 

 

 

Argon

 

 

 

 

All Positions5

All Positions

Argon + 1% O2

Flat & Horizontal5

 

Flat & Horizontal5

 

 

 

Fillet

 

Fillet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Argon + 2% O2

Flat & Horizontal5

 

Flat & Horizontal5

 

 

 

Fillet

 

Fillet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Argon + 5% O2

Flat & Horizontal5

 

 

 

 

 

Fillet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Argon + 8% CO2

Flat & Horizontal5

All Positions

 

 

 

 

Fillet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Argon + 25%

Flat & Horizontal1

All Positions

 

All Positions3

 

 

CO2

Fillet

 

 

 

 

 

 

 

 

Argon + 50%

 

All Positions

 

 

 

 

CO2

 

 

 

 

 

 

 

 

 

 

 

CO2

Flat & Horizontal1

All Positions

 

 

 

 

Fillet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Helium

 

 

 

 

All Positions2

 

Argon + Helium

 

 

 

 

All Positions2

 

Tri-Mix4

 

 

 

All Positions

 

 

1Globular Transfer

2Heavy Thicknesses

3Single Pass Welding Only

490% HE + 7-1/2% AR + 2-1/2% CO2

5Also for GMAW-P, All Positions

9-18. Troubleshooting Guide For Semiautomatic Welding Equipment

Problem

Probable Cause

Remedy

 

 

 

Wire feed motor operates, but

Too little pressure on wire feed rolls.

Increase pressure setting on wire feed rolls.

wire does not feed.

 

 

Incorrect wire feed rolls.

Check size stamped on wire feed rolls, replace to match

 

 

 

wire size and type if necessary.

 

 

 

 

Wire spool brake pressure too high.

Decrease brake pressure on wire spool.

 

 

 

 

Restriction in the gun and/or assembly.

Check and replace cable, gun, and contact tip if

 

 

damaged. Check size of contact tip and cable liner,

 

 

replace if necessary.

 

 

 

Wire curling up in front of the

Too much pressure on wire feed rolls.

Decrease pressure setting on wire feed rolls.

wire feed rolls (bird nesting).

 

 

Incorrect cable liner or gun contact tip size.

Check size of contact tip and check cable liner length

 

 

 

and diameter, replace if necessary.

 

 

 

 

Gun end not inserted into drive housing properly.

Loosen gun securing bolt in drive housing and push gun

 

 

end into housing just enough so it does not touch wire

 

 

feed rolls.

 

 

 

 

Dirty or damaged (kinked) liner.

Replace liner.

 

 

 

OM-947 Page 38

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Contents Processes DescriptionFile Flux Cored Fcaw From Hobart to You Protect Your InvestmentTable of Contents 10-1 10-2Electric Shock can kill Symbol UsageArc Welding Hazards HOT Parts can burnWelding can cause fire or explosion Fumes and Gases can be hazardousARC Rays can burn eyes and skin Flying Metal or Dirt can injure eyesFalling Equipment can injure Welding Wire can injureFire or Explosion hazard Moving Parts can injureEMF Information Principal Safety StandardsCalifornia Proposition 65 Warnings About Implanted Medical DevicesSymboles utilisés UNE Décharge Électrique peut entraîner la mortIndique des instructions spécifiques LES Pièces Chaudes peuvent provoquer des brûlures LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un incendie ou une explosion Risque D’INCENDIE OU LE Bruit peut endommager l’ouïeLES Bouteilles peuvent exploser si elles sont endommagées LA Chute DE L’ÉQUIPEMENT peut provoquer des blessuresLES Fils DE Soudage peuvent provoquer des blessures Proposition californienne 65 AvertissementsLes Pièces Mobiles peuvent causer des blessures LE Soudage À L’ARC risque de provoquer des interférencesPrincipales normes de sécurité Informations relatives aux CEMEn ce qui concerne les implants médicaux OM-947 Specifications − SpecificationsSymbols And Definitions − DefinitionsVolt-Ampere Curves WarrantyDuty Cycle And Overheating Can damage unit or gun and void− Installation Installing Work ClampSlide insulating grips over handles Tools Needed OM-947 Process/Polarity Table Changing PolarityInstalling Gas Supply Tools Needed 11/16, 1-1/8 Shielding GasInstalling Wire Spool And Adjusting Hub Tension Only applies to units equipped withOptional hub kit Serial Number And Rating Label Location Selecting a Location And Connecting 115 Volt Input PowerMake this installation SectionInstalling Contact Tip And Nozzle Turn off welding power sourceThreading Welding Wire Hold wire tightly to keep it from unravelingOperating The Gun − OperationControls LoadWeld Parameter Chart Overload Protection − Maintenance &TROUBLESHOOTINGRoutine Maintenance Drive Motor ProtectionChanging Drive Roll Or Wire Inlet Guide Retaining Knob OpeningTurn Off power before replacing contact tip Replacing Gun Contact TipThread wire according to Cleaning Gun LinerHold wire tightly to keep it From unraveling. SecureTools Needed Head Tube Mm / 10 mm Remove black sleeving from end of replacement linerReplacing Gun Liner Tube. Separate gun handle halves10 mm Power source see Section Troubleshooting TableSecure power cord plug in receptacle see Section Trouble Remedy− Electrical Diagram Circuit Diagram− FCAW/GMAW Welding Guidelines Typical Fcaw Process ConnectionsTypical Gmaw MIG Process Connections Amperage Typical Control SettingsWire Size Amperage Range Select VoltageHolding And Positioning Welding Gun End View of Work AngleConditions That Affect Weld Bead Shape Short Normal LongSlow Normal Poor Weld Bead Characteristics Good Weld Bead CharacteristicsGun Movement During Welding Troubleshooting − Excessive Spatter Troubleshooting − PorosityPossible Causes Corrective Actions Troubleshooting − Excessive Penetration Troubleshooting − Lack Of PenetrationTroubleshooting − Incomplete Fusion Troubleshooting − Distortion Troubleshooting − Burn-ThroughTroubleshooting − Waviness Of Bead Base metal to moveApplication Troubleshooting Guide For Semiautomatic Welding EquipmentCommon Gmaw MIG Shielding Gases FilletGas hose in gun and cable assembly Gas nozzle plugged Clean or replace gas nozzleOpen gas valve at cylinder and adjust flow rate Loose or broken wires to gas solenoidConsumables − ACCESSORIES/CONSUMABLESAccessories PkgMaterial Thickness Reference Chart Work like a Pro Service SupportAssistance Contact your Distributor for Hobart Welding Products
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