Hobart Welding Products 125 manual Troubleshooting − Excessive Penetration

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9-11. 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.

9-12. Troubleshooting − Lack Of Penetration

					Lack Of Penetration − shallow
					Lack Of Penetration − shallow
					fusion between weld metal and
					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.

9-13. 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.

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Contents Description ProcessesFile Flux Cored Fcaw From Hobart to You Protect Your InvestmentTable of Contents 10-1 10-2Symbol 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 DevicesUNE Décharge Électrique peut entraîner la mort Symboles utilisésIndique des instructions spécifiques LES Fumées ET LES GAZ peuvent être dangereux LES Pièces Chaudes peuvent provoquer des brûluresLE Soudage peut provoquer un incendie ou une explosion LE Bruit peut endommager l’ouïe LES Bouteilles peuvent exploser si elles sont endommagéesRisque D’INCENDIE OU LA Chute DE L’ÉQUIPEMENT peut provoquer des blessuresProposition californienne 65 Avertissements Les Pièces Mobiles peuvent causer des blessuresLES Fils DE Soudage peuvent provoquer des blessures LE Soudage À L’ARC risque de provoquer des interférencesInformations relatives aux CEM Principales normes de sécuritéEn ce qui concerne les implants médicaux OM-947 − Specifications Symbols And DefinitionsSpecifications − DefinitionsWarranty Duty Cycle And OverheatingVolt-Ampere Curves Can damage unit or gun and voidInstalling Work Clamp − InstallationSlide insulating grips over handles Tools Needed OM-947 Process/Polarity Table Changing PolarityInstalling Gas Supply Tools Needed 11/16, 1-1/8 Shielding GasOnly applies to units equipped with Installing Wire Spool And Adjusting Hub TensionOptional hub kit Selecting a Location And Connecting 115 Volt Input Power Make this installationSerial Number And Rating Label Location SectionInstalling Contact Tip And Nozzle Turn off welding power sourceThreading Welding Wire Hold wire tightly to keep it from unraveling− Operation ControlsOperating The Gun LoadWeld Parameter Chart − Maintenance &TROUBLESHOOTING Routine MaintenanceOverload Protection Drive Motor ProtectionChanging Drive Roll Or Wire Inlet Guide Retaining Knob OpeningTurn Off power before replacing contact tip Replacing Gun Contact TipCleaning Gun Liner Hold wire tightly to keep itThread wire according to From unraveling. SecureRemove black sleeving from end of replacement liner Replacing Gun LinerTools Needed Head Tube Mm / 10 mm Tube. Separate gun handle halves10 mm Troubleshooting Table Secure power cord plug in receptacle see SectionPower source see Section Trouble Remedy− Electrical Diagram Circuit DiagramTypical Fcaw Process Connections − FCAW/GMAW Welding GuidelinesTypical Gmaw MIG Process Connections Typical Control Settings Wire Size Amperage RangeAmperage Select VoltageHolding And Positioning Welding Gun End View of Work AngleShort Normal Long Conditions That Affect Weld Bead ShapeSlow Normal Good Weld Bead Characteristics Poor Weld Bead CharacteristicsGun Movement During Welding Troubleshooting − Porosity Troubleshooting − Excessive SpatterPossible Causes Corrective Actions Troubleshooting − Lack Of Penetration Troubleshooting − Excessive PenetrationTroubleshooting − Incomplete Fusion Troubleshooting − Burn-Through Troubleshooting − Waviness Of BeadTroubleshooting − Distortion Base metal to moveTroubleshooting Guide For Semiautomatic Welding Equipment Common Gmaw MIG Shielding GasesApplication FilletGas nozzle plugged Clean or replace gas nozzle Open gas valve at cylinder and adjust flow rateGas hose in gun and cable assembly Loose or broken wires to gas solenoid− ACCESSORIES/CONSUMABLES AccessoriesConsumables PkgMaterial Thickness Reference Chart Work like a Pro Support ServiceAssistance Contact your Distributor for Hobart Welding Products