Miller Electric OM-1313 manual Common MIG Shielding Gases, Application

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6-16. 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 Steel

Short Circuiting

Aluminum

 

Stainless Steel

 

 

 

 

 

 

 

 

 

Argon

 

 

 

X

 

 

 

 

 

Argon + 25% CO2

 

X

 

 

 

 

 

 

 

80% or greater Argon +

X

X1

 

 

balance CO2 or Oxygen

 

 

 

 

 

 

 

 

 

 

 

100% CO2

 

X

X

 

 

 

 

 

 

Tri-Mix2

 

 

X

 

1Limited short circuiting use

290% HE + 7-1/2% AR + 2-1/2% CO2

6-17. 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.

 

 

 

Wire feeds, but no gas flows.

Gas cylinder empty.

Replace empty gas cylinder.

 

 

 

 

Gas nozzle plugged.

Clean or replace gas nozzle.

 

 

 

 

Gas cylinder valve not open or flowmeter not adjusted.

Open gas valve at cylinder and adjust flow rate.

 

 

 

 

Restriction in gas line.

Check gas hose between flowmeter and wire feeder, and

 

 

gas hose in gun and cable assembly.

 

 

 

 

Loose or broken wires to gas solenoid.

Have Factory Authorized Service Agent repair wiring.

 

 

 

 

Gas solenoid valve not operating.

Have Factory Authorized Service Agent replace gas

 

 

solenoid valve.

 

 

 

 

Incorrect primary voltage connected to welding power

Check primary voltage and relink welding power source

 

source.

for correct voltage.

 

 

 

OM-1313 Page 29

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Contents Visit our website at Arc Welding Power Source Wire FeederSeptember MIG Gmaw Welding Flux Cored Fcaw WeldingFrom Miller to You Table of Contents Page Marks a special safety message Symbol UsageArc Welding Hazards OM-1313ARC Rays can burn eyes and skin Fire or Explosion hazard Principal Safety StandardsAbout Pacemakers EMF InformationInstallation SpecificationsVolt-Ampere Curves Exceeding duty cycle can damage unit and void warranty Welding Power Source Duty Cycle And OverheatingWelding Gun Duty Cycle And Overheating OverheatingInstalling Gas Supply Installing Work ClampSetting Gun Polarity Installing Welding GunPolarity Changeover Label Tools Needed 11/16Turn Off unit, and disconnect input power Installing Wire Spool And Adjusting Hub TensionReinstall wrapper Tools Needed 7/16 Changing Input VoltageSelecting a Location And Connecting Input Power Electrical Service GuideInput Voltage Min Grounding Conductor Size In AWG/KcmilThreading Welding Wire OM-1313 Operation Front Panel ControlsControls For Standard Units Higher e.g Volts AC Lower e.g Volts AC Weld Parameter ChartOM-1313 Maintenance & Troubleshooting Routine MaintenanceMonths Disconnect gun first Cleaning Or Replacing Gun LinerHead Tube Remove nozzle, contact tip, and adapter Blow out gun casing Remove linerRemove handle locking nut Slide handle Replacing Switch And/Or Head TubeTroubleshooting Replacing Gun Contact TipSee Section Circuit Diagram Electrical DiagramMIG Welding Gmaw Guidelines Wire Feeder Power Source Gun Work Clamp WorkpieceTypical MIG Process Connections Shielding Gas Regulator/ FlowmeterWire Recommendation Wire Speed Typical MIG Process Control SettingsSelect Wire Size Select VoltageHolding And Positioning Welding Gun Push Conditions That Affect Weld Bead ShapePerpendicular Drag Short Normal LongPoor Weld Bead Characteristics Good Weld Bead CharacteristicsGun Movement During Welding Troubleshooting Porosity Troubleshooting Excessive SpatterTroubleshooting Excessive Penetration Possible Causes Corrective ActionsTroubleshooting Lack Of Penetration Troubleshooting Incomplete FusionTroubleshooting Burn-Through Troubleshooting Waviness Of Bead Troubleshooting DistortionWeld bead Troubleshooting Guide For Semiautomatic Welding Equipment Common MIG Shielding GasesApplication Readjust welding parameters Welding arc not stable Wire slipping in drive rollsWelding power source Drive rolls if necessaryOM-1313 Main Assembly Parts ListDia Part Mkgs Description Quantity Center Baffle w/Components Baffle, Center w/Components -1 Item M-15 Gun -1 Item Items IncludesPage Service Your distributor also givesSupport Owner’s Record