Hobart Welding Products 187 Troubleshooting − Lack Of Penetration, Troubleshooting − Burn-Through

Page 42

9-11. Troubleshooting − Lack Of Penetration

 

 

 

 

 

Lack Of Penetration − shallow

 

 

 

 

 

 

 

 

 

 

fusion between weld metal and

 

 

 

 

 

 

 

 

base metal.

Lack of Penetration

Good Penetration

 

 

 

 

 

S-0638

 

 

 

 

Possible Causes

 

 

Corrective Actions

 

 

 

Improper joint preparation.

 

Material too thick. Joint preparation and design must provide access to bottom of groove while

 

 

 

 

maintaining proper welding wire extension and arc characteristics.

 

 

 

Improper weld technique.

 

Maintain normal gun angle of 0 to 15 degrees to achieve maximum penetration.

 

Keep arc on leading edge of weld puddle.

 

 

 

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

 

 

Insufficient heat input.

Select higher wire feed speed and/or select higher voltage range.

 

 

 

Reduce travel speed.

 

 

Incorrect polarity.

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

9-12. Troubleshooting − Incomplete Fusion

 

 

Incomplete Fusion − failure of weld metal to fuse completely with

 

 

base metal or a preceeding weld bead.

 

 

S-0637

 

 

 

 

 

 

 

Possible Causes

 

Corrective Actions

 

 

 

Workpiece dirty.

 

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

 

 

welding.

 

 

 

Insufficient heat input.

 

Select higher voltage range and/or adjust wire feed speed.

 

 

 

Improper welding technique.

 

Place stringer bead in proper location(s) at joint during welding.

 

 

 

 

 

Adjust work angle or widen groove to access bottom during welding.

 

 

 

 

 

Momentarily hold arc on groove side walls when using weaving technique.

 

 

 

 

 

Keep arc on leading edge of weld puddle.

 

 

 

 

 

Use correct gun angle of 0 to 15 degrees.

 

 

 

9-13. Troubleshooting − Burn-Through

Burn-Through − weld metal melting completely through base metal resulting in holes where no metal remains.

S-0640

Possible Causes

Corrective Actions

 

 

Excessive heat input.

Select lower voltage range and reduce wire feed speed.

 

 

 

Increase and/or maintain steady travel speed.

 

 

OM-228 187 Page 38

 

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Contents Description OM-228 187BProcesses 2010−01From Hobart to You Protect Your InvestmentTable of Contents − Parts List Electric Shock can kill Symbol UsageArc Welding Hazards HOT Parts can burnWelding can cause fire or explosion Fumes and Gases can be hazardousARC Rays can burn eyes and skin Flying Metal or Dirt can injure eyesFalling Equipment can injure Welding Wire can injureFire or Explosion hazard Moving Parts can injureEMF Information Principal Safety StandardsCalifornia Proposition 65 Warnings 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 Risque D’INCENDIE OU LE Bruit peut endommager l’ouïeLES Bouteilles peuvent exploser si elles sont endommagées LA Chute DE L’ÉQUIPEMENT peut provoquer des blessuresLES Fils DE Soudage peuvent provoquer des blessures Proposition californienne 65 AvertissementsLes Pièces Mobiles peuvent causer 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-228 187 Specifications − SpecificationsSymbols And Definitions − DefinitionsAmperes Duty Cycle And OverheatingVolt-Ampere Curves Output− Installation Installing Nozzle, Contact Tip, And AdapterInstalling Welding Gun Installing Work Clamp Turn off welding power source Process/Polarity TableChanging Polarity Installing Gas Supply Selecting a Location And Connecting Input Power Electrical Service Guide Installing Wire Spool And Adjusting Hub TensionThreading Welding Wire Hold wire tightly to keep it from unraveling− Operation ControlsOM-228 187 Weld Parameter Chart CFH227010 Overload Protection − Maintenance & TroubleshootingRoutine Maintenance Drive Motor ProtectionChanging Drive Roll Or Wire Inlet Guide Thread wire according to Replacing Switch And/Or Head Tube Troubleshooting Table Trouble RemedyOM-228 187 − Electrical Diagram Circuit Diagram228 180-A − MIG Welding Gmaw Guidelines Typical MIG Process ConnectionsTypical MIG Process Control Settings Wire Size Amperage RangeSelect Voltage Holding And Positioning Welding Gun Groove WeldsConditions That Affect Weld Bead Shape Poor Weld Bead Characteristics Good Weld Bead CharacteristicsGun Movement During Welding Troubleshooting − Excessive Penetration Troubleshooting − Excessive SpatterTroubleshooting − Porosity Possible Causes Corrective ActionsTroubleshooting − Lack Of Penetration Troubleshooting − Incomplete FusionTroubleshooting − Burn-Through Troubleshooting − Waviness Of Bead Troubleshooting − DistortionTroubleshooting Guide For Semiautomatic Welding Equipment Common MIG Shielding GasesApplication Welding arc not stable Wire slipping in drive rolls − Parts List Main AssemblyDia Part Description Quantity 228 H100S2-10 Gun 245Optional Drive Rolls OptionsService SupportAssistance Contact your Distributor for Hobart Welding Products
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