Hobart Welding Products 210 MVP manual Common MIG Shielding Gases, Application

Page 48

9-16. 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

 

 

 

 

 

 

 

Tri-Mix2

 

 

X

 

1Limited short circuiting use

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

9-17. 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-249 498 Page 44

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Contents OM-249 498B ProcessesDescription File MIG GmawFrom Hobart to You Protect Your InvestmentTable of Contents Warranty Symbol Usage Arc Welding HazardsElectric Shock can kill HOT Parts can burnFumes and Gases can be hazardous ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal or Dirt can injure eyesWelding Wire can injure Fire or Explosion hazardFalling Equipment can injure Moving Parts can injurePrincipal Safety Standards California Proposition 65 WarningsEMF Information About Implanted Medical DevicesSymboles utilisés UNE Décharge Électrique peut entraîner la mortLES Pièces Chaudes peuvent provoquer des brûlures LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un incendie ou une explosion LE Bruit peut endommager l’ouïe LES Bouteilles peuvent exploser si elles sont endommagéesRisque D’INCENDIE OU LA Chute DE L’ÉQUIPEMENT peut provoquer des blessuresProposition californienne 65 Avertissements Les Pièces Mobiles peuvent causer des blessuresLES Fils DE Soudage peuvent provoquer 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-249 498 Symbols And Definitions − DefinitionsI1max I1eff− Specifications Specifications For 230 VACSpecifications For 115 VAC Duty Cycle And Overheating 30% duty cycle at 150 amps Minutes Welding20% duty cycle at 90 amps Minutes Welding OverheatingVolt-Ampere Curves Voltage Amperage− Installation Installing Nozzle, Contact Tip, And AdapterInstalling Welding Gun Installing Work Clamp Turn off welding power source Process/Polarity TableChanging Polarity Installing Gas Supply After flow is set, close pressure assemblyTools Needed 1-1/8 Electrical Service Guide Extension Cord Data Use Shortest Cord PossibleMulti−Voltage Plug MVP Connection Selecting a Location And Connecting Input Power Do not move or operate Unit where it could tipDo Not modify or rewire receptacle Connection Serial Number And Rating Label LocationInstallation Local Codes − have onlyQualified Persons Make YellowConnecting 1-Phase Input Power For 115 VAC Input Installing Wire Spool And Adjusting Hub Tension Installing 8 in mm Wire SpoolConnecting Optional Spool Gun Wire Feed Speed ControlExposed O-rings Threading Welding Wire − Operation ControlsWeld Parameter Chart − Maintenance &TROUBLESHOOTING Routine MaintenanceOverload Protection Drive Motor ProtectionChanging Drive Roll Or Wire Inlet Guide 023/.025030/.035 Groove Knurled Smooth StampedNozzle Contact Tip Tip Adapter Head Tube Remove nozzle, contact tip, and adapter Blow out gun casingStickout Tools Needed Mm, 10 mm Replacing Switch And/Or Head Tube Troubleshooting Table Trouble Remedy− Electrical Diagram Circuit Diagram249 315-A Regulator Flowmeter Shielding Gas Wire Feeder Power Source − MIG Welding Gmaw GuidelinesTypical MIG Process Connections Gun Workpiece Work ClampTypical MIG Process Control Settings Wire Size Amperage RangeSelect Voltage Holding And Positioning Welding Gun Groove WeldsConditions That Affect Weld Bead Shape PushPerpendicular Drag Short Normal LongPoor Weld Bead Characteristics Good Weld Bead CharacteristicsGun Movement During Welding Troubleshooting − Excessive Spatter Troubleshooting − PorosityTroubleshooting − Excessive Penetration Possible Causes Corrective ActionsTroubleshooting − Lack Of Penetration Troubleshooting − Incomplete FusionTroubleshooting − Burn-Through Troubleshooting − Waviness Of Bead Troubleshooting − DistortionBase metal to move DirectionTroubleshooting Guide For Semiautomatic Welding Equipment Common MIG Shielding GasesApplication Welding arc not stable Wire slipping in drive rolls Readjust welding parametersWelding power source Drive rolls if necessary− Parts List 57 5849 32 Dia Part Description Quantity Optional H100S4-10 Gun 245Optional Drive Rolls OptionsConsumables Service SupportAssistance Contact your Distributor for Hobart Welding Products