Hobart Welding Products 230 manual Troubleshooting − Excessive Spatter, Troubleshooting − Porosity

Page 40

6-8.

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.

6-9.

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.

6-10.

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-235 281 Page 36

 

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Contents OM-235 281A 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 Fumées ET LES GAZ peuvent être dangereux DES Pièces Chaudes peuvent provoquer des brûlures gravesLE Soudage peut provoquer un in cendie ou une explosion LE Bruit peut endommager l’ouïe LES Bouteilles peuvent exploser si elles sont endommagéesRisque D’INCENDIE OU D’EXPLO- Sion LA Chute DE L’APPAREIL peut blesserLES Fils DE Soudage peuvent provoquer des blessures Proposition californienne 65 AvertissementsLE Soudage À L’ARC risque de provoquer des interférences Information EMF Principales normes de sécuritéEn ce qui concerne les implants médicaux OM-235 281 Welding Power Source Duty Cycle And Overheating SpecificationsOverheating Volt-Ampere Curves VoltageAmperage 40.0 35.0 30.0 25.0 20.0 15.0 10.0 100 150 200 250 300Installing Welding Gun MIG GUNConnecting To Weld Output Terminals Installing Work ClampSetting Gun Polarity For Wire Type Installing 2 lb Wire Spool And Adjusting Hub TensionChanging Polarity Electrode Negative DcenInstalling 10 lb Wire Spool And Adjusting Hub Tension Installing 33 lb Wire Spool And Adjusting Hub TensionRear Panel Installing Gas SupplyTools Needed 1-1/8, 5/8 Turn off and disconnect input power Positioning Jumper LinksElectrical Service Guide Hz SingleInput Voltage Input Amperes At Rated OutputSelecting a Location And Connecting Input Power Do not move or operate unit where it could tipSpecial installation may be Conductors from unitThreading Welding Wire Turn Off unit, and disconnect input power Controls Wire Speed Control3070 2080 1090 Selecting Wire, Gas and Control Settings Weld ParametersRoutine Maintenance Disconnect powerSupplementary Protectors Before maintainingTurn Off power Replacing Drive Roll And Wire Inlet GuideRemoving Knob From Front Panel Turn Off power before replacing contact tip Aligning Drive Rolls and Wire GuideReplacing Gun Contact Tip Turn Off power before Installing cable hangers Installing Cable HangersCable Hanger Screws Tools Needed Turn off welding power source/wire feeder Welding Troubleshooting Table Wire Drive/Gun Troubleshooting TableWire Drive/Gun Trouble Remedy Welding Trouble Remedy− MIG Welding Gmaw Guidelines Typical MIG Process ConnectionsTypical MIG Process Control Settings Wire Size Amperage RangeAmperage Select VoltageHolding And Positioning Welding Gun Groove WeldsConditions That Affect Weld Bead Shape PushPerpendicular Drag Short Normal LongGood Weld Bead Characteristics Poor Weld Bead CharacteristicsGun Movement During Welding Troubleshooting − Excessive Spatter Troubleshooting − PorosityTroubleshooting − Excessive Penetration Possible Causes Corrective ActionsTroubleshooting − Incomplete Fusion Troubleshooting − Lack Of PenetrationTroubleshooting − Burn-Through Troubleshooting − Waviness Of Bead Troubleshooting − DistortionBase metal to move DirectionCommon MIG Shielding Gases Troubleshooting Guide For Semiautomatic Welding EquipmentApplication Welding arc not stable Wire slipping in drive rolls Readjust welding parametersWelding power source Drive rolls if necessary− Electrical Diagram Main Assembly 10 − Fig 17 − FigItem Dia Part Description Quantity Mkgs Center Baffle w/Components Center Baffle w/Components -1Item Rear Panel w/Components Front Panel w/Components Wire Drive Assembly 234 Wire Drive AssemblyH200L4−15 Gun 237Accessories Knurl Drive Roll For Hard Shell Cored WiresSupport ServiceAssistance Contact your Distributor for Hobart Welding Products
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