Hobart Welding Products 210 MVP Troubleshooting − Excessive Spatter, Troubleshooting − Porosity

Page 45

9-8.

Troubleshooting − Excessive Spatter

 

 

Excessive Spatter − scattering of molten metal particles that

 

 

cool to solid form near weld bead.

 

 

S-0636

 

Possible Causes

Corrective Actions

Wire feed speed too high.

Select lower wire feed speed.

Voltage too high.

Select lower voltage range.

Electrode extension (stickout) too long.

Use shorter electrode extension (stickout).

Workpiece dirty.

Remove all grease, oil, moisture, rust, paint, undercoating, and dirt from work surface before welding.

Insufficient shielding gas at welding arc.

Increase flow of shielding gas at regulator/flowmeter and/or prevent drafts near welding arc.

Dirty welding wire.

Use clean, dry welding wire.

 

 

Eliminate pickup of oil or lubricant on welding wire from feeder or liner.

Incorrect polarity.

Check polarity required by welding wire, and change to correct polarity at welding power source.

9-9.

Troubleshooting − Porosity

 

 

Porosity − small cavities or holes resulting from gas pockets

 

 

in weld metal.

 

 

S-0635

 

Possible Causes

Corrective Actions

Insufficient shielding gas at welding arc.

Increase flow of shielding gas at regulator/flowmeter and/or prevent drafts near welding arc.

 

 

Remove spatter from gun nozzle.

 

 

Check gas hoses for leaks.

 

 

Place nozzle 1/4 to 1/2 in. (6-13 mm) from workpiece.

 

 

Hold gun near bead at end of weld until molten metal solidifies.

Wrong gas.

Use welding grade shielding gas; change to different gas.

Dirty welding wire.

Use clean, dry welding wire.

 

 

Eliminate pick up of oil or lubricant on welding wire from feeder or liner.

Workpiece dirty.

Remove all grease, oil, moisture, rust, paint, coatings, and dirt from work surface before welding.

 

 

Use a more highly deoxidizing welding wire (contact supplier).

Welding wire extends too far out of nozzle.

Be sure welding wire extends not more than 1/2 in. (13 mm) beyond nozzle.

9-10.

Troubleshooting − Excessive Penetration

 

 

Excessive Penetration − weld metal melting through base metal

 

 

and hanging underneath weld.

 

Excessive Penetration Good Penetration

 

 

S-0639

 

Possible Causes

Corrective Actions

Excessive heat input.

Select lower voltage range and reduce wire feed speed.

 

 

Increase travel speed.

 

 

OM-249 498 Page 41

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Contents Processes OM-249 498BDescription File MIG GmawProtect Your Investment From Hobart to YouTable of Contents Warranty Arc Welding Hazards Symbol UsageElectric Shock can kill HOT Parts can burnARC Rays can burn eyes and skin Fumes and Gases can be hazardousWelding can cause fire or explosion Flying Metal or Dirt can injure eyesFire or Explosion hazard Welding Wire can injureFalling Equipment can injure Moving Parts can injureCalifornia Proposition 65 Warnings Principal Safety StandardsEMF Information About Implanted Medical DevicesUNE Décharge Électrique peut entraîner la mort Symboles utilisésLES Pièces Chaudes peuvent provoquer des brûlures LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un incendie ou une explosion LES Bouteilles peuvent exploser si elles sont endommagées LE Bruit peut endommager l’ouïeRisque D’INCENDIE OU LA Chute DE L’ÉQUIPEMENT peut provoquer des blessuresLes Pièces Mobiles peuvent causer des blessures Proposition californienne 65 AvertissementsLES 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 − Definitions Symbols And DefinitionsI1max I1eff− Specifications Specifications For 230 VACSpecifications For 115 VAC 30% duty cycle at 150 amps Minutes Welding Duty Cycle And Overheating20% duty cycle at 90 amps Minutes Welding OverheatingVoltage Amperage Volt-Ampere Curves− 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 Extension Cord Data Use Shortest Cord Possible Electrical Service GuideMulti−Voltage Plug MVP Connection Do not move or operate Unit where it could tip Selecting a Location And Connecting Input PowerDo Not modify or rewire receptacle Connection Serial Number And Rating Label LocationLocal Codes − have only InstallationQualified Persons Make YellowConnecting 1-Phase Input Power For 115 VAC Input Installing 8 in mm Wire Spool Installing Wire Spool And Adjusting Hub TensionConnecting Optional Spool Gun Wire Feed Speed ControlExposed O-rings Threading Welding Wire Controls − OperationWeld Parameter Chart Routine Maintenance − Maintenance &TROUBLESHOOTINGOverload Protection Drive Motor Protection023/.025 Changing Drive Roll Or Wire Inlet Guide030/.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 Trouble Remedy Troubleshooting TableCircuit Diagram − Electrical Diagram249 315-A − MIG Welding Gmaw Guidelines Regulator Flowmeter Shielding Gas Wire Feeder Power SourceTypical MIG Process Connections Gun Workpiece Work ClampTypical MIG Process Control Settings Wire Size Amperage RangeSelect Voltage Groove Welds Holding And Positioning Welding GunPush 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 − Distortion Troubleshooting − Waviness Of BeadBase metal to move DirectionTroubleshooting 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 necessary− Parts List 57 5849 32 Dia Part Description Quantity Optional 245 H100S4-10 GunOptional Drive Rolls OptionsConsumables Service SupportAssistance Hobart Welding Products Contact your Distributor for
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