Miller Electric DVI-2 R manual Troubleshooting − Excessive Spatter, Troubleshooting − Porosity

Page 41

8-8.

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.

8-9.

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.

8-10. 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-232 386 Page 37

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Contents Processes OM-232 386BDescription File MIG GmawFrom Miller to You Table of Contents Typical MIG Process Connections − Parts List− MIG Welding Gmaw Guidelines Arc Welding Hazards Symbol UsageElectric Shock can kill HOT Parts can cause severe burnsARC 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 cause injuryFalling Unit can cause injury Moving Parts can cause injuryCalifornia Proposition 65 Warnings Principal Safety StandardsEMF Information About Implanted Medical DevicesUNE Décharge Électrique peut entraîner la mort Symboles utilisésLE Soudage peut provoquer un in cendie ou une explosion DES Pièces Chaudes peuvent provoquer des brûlures gravesLES Fumées ET LES GAZ peuvent être dangereux LES Bouteilles peuvent exploser si elles sont endommagées LE Bruit peut endommager l’ouïeRisque D’INCENDIE OU D’EXPLO LA Chute DE L’APPAREIL peut blesserLE Soudage À L’ARC risque de provoquer des interférences Proposition californienne 65 AvertissementsLES Fils DE Soudage peuvent provoquer des blessures En ce qui concerne les implants médicaux Principales normes de sécuritéInformation EMF OM-232 386 Symbols And Definitions − InstallationSpecifications − Definitions40% duty cycle at 150 amps Minutes Welding Minutes Resting Duty Cycle And OverheatingOverheating MinutesCorrect Installation Connecting To Weld Output TerminalsVolt-Ampere Curves Range Range 4 RangeSetting Gun Polarity For Wire Type Installing Work Cable And ClampPolarity Changeover Label Information 11/16Tools Needed 8, 5/8 Installing Gas SupplyRear Panel Installing 1 Or 2 lb Wire Spool Installing MIG Wire Spool and Adjusting Hub TensionUse compression spring With 8 in 200 mm spools To turn spool, tension is set230 VAC =GND/PE Earth Ground Connecting 1-Phase Input Power For 230 VACExtension Cord Data Electrical Service Guide For 230 VACHz Single Phase 18 in 457 mm of space for airflow Selecting a Location And Connecting Input PowerDo not move or operate unit where it could tip Pressure Threading Welding WireScale Remove gun nozzle and contact tipTurn Off unit, and disconnect input power Connecting An Optional Spool Gun Voltage Control − OperationControls Voltage Chart Settings Weld Parameter ChartInput Line Parameter226 652-A Routine Maintenance − Maintenance &TROUBLESHOOTINGChanging Drive Roll and Wire Inlet Guide Unit OverloadTroubleshooting Aligning Drive Rolls and Wire GuideTurn Off power Welding Trouble RemedyWire Drive/Gun Trouble Remedy OM-232 386 Welding Power Source Circuit Diagram − Electrical Diagram229 598-B Typical MIG Process Connections − MIG Welding Gmaw GuidelinesWire Size Amperage Range Typical MIG Process Control SettingsAmperage Select VoltageGroove Welds Holding And Positioning Welding GunPush Conditions That Affect Weld Bead ShapePerpendicular Drag Short Normal LongGun 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 Weld bead Troubleshooting − Waviness Of BeadTroubleshooting − Distortion Problem Probable Cause Remedy Troubleshooting Guide For Semiautomatic Welding EquipmentCommon MIG Shielding Gases ApplicationReadjust welding parameters Welding arc not stable Wire slipping in drive rollsWelding power source Drive rolls if necessaryDrive Roll And Wire Guide Kits − Parts ListSupport ServiceYour distributor also gives Miller Electric Mfg. Co To locate a Distributor or Service Agency visitFor assistance in filing or settling claims, contact Your distributor and/or equipment manufacturer’s
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