Hobart Welding Products 187 manual Troubleshooting − Excessive Spatter, Troubleshooting − Porosity

Page 41

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.

 

 

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Contents Processes OM-228 187BDescription 2010−01Protect Your Investment From Hobart to YouTable of Contents − Parts List 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 utilisésLE Soudage peut provoquer un incendie ou une explosion LES Pièces Chaudes peuvent provoquer des brûluresLES Fumées ET LES GAZ peuvent être dangereux 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 interférencesEn ce qui concerne les implants médicaux Principales normes de sécuritéInformations relatives aux CEM OM-228 187 Symbols And Definitions − SpecificationsSpecifications − DefinitionsVolt-Ampere Curves Duty Cycle And OverheatingAmperes OutputInstalling Welding Gun − InstallationInstalling Nozzle, Contact Tip, And Adapter Installing Work Clamp Changing Polarity Turn off welding power sourceProcess/Polarity Table Installing Gas Supply Selecting a Location And Connecting Input Power Installing Wire Spool And Adjusting Hub Tension Electrical Service GuideHold wire tightly to keep it from unraveling Threading Welding WireControls − OperationOM-228 187 CFH Weld Parameter Chart227010 Routine Maintenance − Maintenance & TroubleshootingOverload Protection Drive Motor ProtectionChanging Drive Roll Or Wire Inlet Guide Thread wire according to Replacing Switch And/Or Head Tube Trouble Remedy Troubleshooting TableOM-228 187 Circuit Diagram − Electrical Diagram228 180-A Typical MIG Process Connections − MIG Welding Gmaw GuidelinesSelect Voltage Typical MIG Process Control SettingsWire Size Amperage Range Groove Welds Holding And Positioning Welding GunConditions That Affect Weld Bead Shape Gun Movement During Welding Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Troubleshooting − Porosity Troubleshooting − Excessive SpatterTroubleshooting − Excessive Penetration Possible Causes Corrective ActionsTroubleshooting − Burn-Through Troubleshooting − Lack Of PenetrationTroubleshooting − Incomplete Fusion Troubleshooting − Distortion Troubleshooting − Waviness Of BeadApplication Troubleshooting Guide For Semiautomatic Welding EquipmentCommon MIG Shielding Gases Welding arc not stable Wire slipping in drive rolls Main Assembly − Parts ListDia Part Description Quantity 228 245 H100S2-10 GunOptions Optional Drive RollsAssistance ServiceSupport Hobart Welding Products Contact your Distributor for
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