Miller Electric Bobcat 225 manual Common MIG Shielding Gases, Application, Fillet

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15-15. Common 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
	Spray Arc Steel	Steel	Stainless Steel	Stainless Steel	Aluminum	Aluminum
		Steel	Stainless Steel	Stainless Steel	Aluminum	Aluminum

Argon					All Positions5	All Positions
Argon + 1% O2	Flat & Horizontal5		Flat & Horizontal5
Argon + 1% O2	Fillet		Fillet
	Fillet		Fillet

Argon + 2% O2	Flat & Horizontal5		Flat & Horizontal5
Argon + 2% O2	Fillet		Fillet
	Fillet		Fillet

Argon + 5% O2	Flat & Horizontal5
Argon + 5% O2	Fillet
	Fillet

Argon + 8% CO2	Flat & Horizontal5	All Positions
Argon + 8% CO2	Fillet	All Positions
	Fillet

Argon + 25%	Flat & Horizontal1	All Positions		All Positions3
CO2	Fillet	All Positions		All Positions3
CO2	Fillet
Argon + 50%		All Positions
CO2		All Positions
CO2
CO2	Flat & Horizontal1	All Positions
CO2	Fillet	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

OM-4434 Page 71

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Contents File Engine Drive OM-4434From Miller to You Table of Contents 11-1 10-110-2 10-3HOT Parts can cause severe burns Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion Fumes and Gases can be hazardousBuildup of GAS can injure or kill ARC Rays can burn eyes and skinCompressed Air Hazards Engine HazardsFalling Unit can cause injury Welding Wire can cause injuryHOT Parts can cause burns and injury Fire or Explosion hazardRadiation can cause interference Principal Safety StandardsCalifornia Proposition 65 Warnings EMF InformationIndique des instructions spécifiques Signification des symboles− Consignes DE Sécurité − Lire Avant Utilisation UN Choc Électrique peut tuerDES Pièces Chaudes peuvent provoquer des brûlures graves LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un in cendie ou une explosion LE Bruit peut affecter l’ouïe ’EXPLOSION DE LA Batterie peuDES Organes Mobiles peuvent pro voquer des blessures LA Chaleur DU Moteur peut pro- voquer un incendie ’AIR Comprimé peut provoquer des blessuresRisque D’INCENDIE OU D’EXPLO- Sion ’EMPLOI Excessif peut LE Surchauffement peut endom- mager le moteur électriqueDES Organes Mobiles peuvent provoquer des blessures LES Fils DE Soudage peuvent provoquer des blessuresProposition californienne 65 Avertissements Principales normes de sécuritéInformation EMF − Definitions − SpecificationsSymbol Definitions Weld, Power, and Engine SpecificationsDimensions Dimensions, Weights, and Operating AnglesDimensions For Units With Optional Running Gear Robin-PoweredUnit 560 lb 254 kgFuel Consumption Kohler-Powered Units Fuel Consumption Robin-Powered UnitsFor CC/AC Mode For CC/DC Mode For CV/DC ModeVolt-Ampere Curves Duty Cycle Generator Power CurveDo not use flexible mounts Grounding − InstallationInstalling Welding Generator MountingEngine Prestart Checks Robin-Powered Units Oil CheckOil Engine Prestart Checks Kohler-Powered Units Replacing The Battery Installing Exhaust PipeConnecting Or Replacing the Battery Connecting The Battery Connect negative − cable lastWork Weld Output Terminal Connecting to Weld Output TerminalsTools Needed Correct Installation Stop engineSelecting Weld Cable Sizes 150 ft 200 ft 250 ft350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m OM-4434 − Operating the Welding Generator Engine Control SwitchPlace switch in Run position to operate most MIG equipment Coarse Range SwitchFrequently Loaded Cold Weather Engine OperationInfrequently LoadedElectrode Typical Stick Welding Connections And Control SettingsTypical MIG Welding Connections And Settings Solid Wire ApplicationsBe sure to use the correct size weld cables see Section Fine Control, Weld Process switch Settings Self-Shielded Flux Core Wire ApplicationsWork Typical Settings ForSet wire feed speed between 240-270 ipm OM-4434 MaterialStandard Receptacles − Operating Auxiliary EquipmentBreaker trips Optional Generator Power ReceptaclesReceptacle Simultaneous Weld And PowerWiring Optional 240 Volt Plug Current Available in Amperes 240Maintenance Label Robin-Powered Units − Maintenance ROBIN-POWERED Units200 Routine Maintenance Robin-Powered UnitsStop engine before maintaining 100Servicing Air Cleaner Robin-Powered Units Servicing Optional Spark Arrestor Robin-Powered UnitsStop engine and let cool Oil Fill Close valve and valve capBefore adding oil Running engineWeld/Power Speed Adjustment Adjusting Engine Speed Robin-Powered UnitsIdle Speed Adjustment Turn idle speed screw for fine adjustmentsStop engine. Disconnect negative − battery cable Overload Protection Robin-Powered UnitsMaintenance Label Kohler-Powered Units − Maintenance − KOHLER-POWERED UnitsHours Nl Weld Cables ~ Slip Rings Nl Brushes OM-4434 Routine Maintenance Kohler-Powered UnitsServicing Air Cleaner Kohler−Powered Units Stop engine and let cool Oil Drain Valve 2 ID x 7 in Hose Oil FilterFull Before adding oil Running engine Turn idle speed screw for fine ad- justments Adjusting Engine Speed Kohler-Powered UnitsOverload Protection Kohler-Powered Units Servicing Optional Spark Arrestor Kohler-Powered UnitsIf a fuse opens, it usually indi Trouble Remedy − TroubleshootingWelding Troubleshooting Generator Power TroubleshootingEngine Troubleshooting Recommended Spare Parts − Parts ListControl switch S2, and throttle solenoid TS1 Recommended Spare PartsCircuit Diagram For Welding Generator − Electrical Diagrams228 461-A − Generator Power Guidelines Selecting EquipmentGrounding Generator To Truck Or Trailer Frame How Much Power Does Equipment Require? Grounding When Supplying Building SystemsFarm/Home Equipment Rating Starting Watts Running Watts Approximate Power Requirements For Industrial MotorsApproximate Power Requirements For Farm/Home Equipment Industrial Motors Rating Starting Watts Running WattsContractor Rating Starting Watts Running Watts Approximate Power Requirements For Contractor EquipmentKVA/HP x HP x 1000 / Volts = Starting Amperage Power Required To Start MotorHow Much Power Can Generator Supply? Single-Phase Induction Motor Starting RequirementsTypical Connections To Supply Standby Power Cord Lengths for 240 Volt Loads Selecting Extension Cord Use Shortest Cord PossibleCord Lengths for 120 Volt Loads Current Load Watts Amperes− Stick Welding Smaw Guidelines Stick Welding ProcedureElectrode and Amperage Selection Chart Striking an Arc − Scratch Start TechniqueStriking an Arc − Tapping Technique 10-30 9090 End View of Work Angle Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Positioning Electrode HolderElectrode Movement During Welding Conditions That Affect Weld Bead Shape16 in 30 1.6 mm Tack Welds Butt JointsLap Joint Tee JointPossible Causes Corrective Actions Troubleshooting − PorosityTroubleshooting − Excessive Spatter Weld TestTroubleshooting − Incomplete Fusion Troubleshooting − Lack Of PenetrationTroubleshooting − Excessive Penetration Troubleshooting − Burn-Through Troubleshooting − Waviness Of BeadTroubleshooting − Distortion Holding And Positioning Welding Gun − MIG Welding Gmaw GuidelinesPush Perpendicular Drag Short Normal LongSlow Normal Fast Gun Movement During Welding 15-7 Troubleshooting − Excessive Spatter 15-8 Troubleshooting − Porosity15-9 Troubleshooting − Excessive Penetration Lack Of Penetration − shallow Fusion between weld metalImproper joint preparation Base metal to move Unsteady hand Support hand on solid surface or use two handsCommon MIG Shielding Gases ApplicationFillet Page Service Your distributor also givesSupport Your distributor and/or equipment manufacturer’s To locate a Distributor or Service Agency visitMiller Electric Mfg. 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