Hobart Welding Products OM-925 217 694A manual Welding arc not stable Wire slipping in drive rolls

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Problem	Probable Cause	Remedy

Welding arc not stable.	Wire slipping in drive rolls.	Adjust pressure setting on wire feed rolls. Replace worn
		drive rolls if necessary.

	Wrong size gun liner or contact tip.	Match liner and contact tip to wire size and type.

	Incorrect voltage setting for selected wire feed speed on	Readjust welding parameters.
	welding power source.

	Loose connections at the gun weld cable or work cable.	Check and tighten all connections.

	Gun in poor shape or loose connection inside gun.	Repair or replace gun as necessary.

OM-925 Page 40

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Contents Description OM-925Processes From Hobart to You Table of Contents Options and Accessories Warranty Symbol Usage Marks a special safety messageArc Welding Hazards Electric Shock can killARC Rays can burn eyes and skin Welding can cause fire or explosionFlying Metal can injure eyes Buildup of GAS can injure or killCalifornia Proposition 65 Warnings About Pacemakers Principal Safety StandardsEMF Information Identifie un message de sécurité particulier − Consignes DE Sécurité − À Lire Avant UtilisationLE Soudage peut causer un incen- die ou une explosion LES Particules Projetées peu- vent blesser les yeuxLES Pièces Chaudes peuvent cau- ser des brûlures graves LE Bruit peut affecter l’ouïeRisque D’INCENDIE OU D’EXPLO LA Chute DE L’APPAREIL peut blesser’EMPLOI Excessif peut Faire LES Pièces Mobiles peuvent cau- ser des blessuresConsignes relatives aux stimulateurs cardiaques Principales normes de sécuritéInformation sur les champs électromagnétiques VAC Model − SpecificationsSpecifications Duty Cycle And Overheating AmperesOutput Duty Cycle % VAC Model Output AmperesVolt-Ampere Curves Voltage− Installation Installing Welding Gun Installing Work ClampProcess/Polarity Table Changing PolarityInstalling Gas Supply Is required Do not move or operate unit where it could tip = GND/PEElectrical Service Guide For 230 VAC Model Installing Wire Spool And Adjusting Hub TensionThreading Welding Wire Hold wire tightly to keep it From unraveling− Operation ControlsWeld Parameter Chart For 115 VAC Model Steel20 ga 18 ga 16 ga 11 ga InchWeld Parameter Chart For 230 VAC Model Wire Welding Package 18 ga 16 ga 11 ga 048 060 Inch− Maintenance &TROUBLESHOOTING Routine MaintenanceDisconnect power before maintaining Overload Protection Drive Motor ProtectionReplacing Gun Contact Tip Changing Drive Roll Or Wire Inlet GuideTurn Off power before replacing contact tip To Reassemble Gun Cleaning Or Replacing Gun LinerDisconnect gun from unit Replacing Switch And/Or Head Tube Troubleshooting Table Trouble Remedy− Electrical Diagram Circuit Diagram For 115 VAC ModelCircuit Diagram For 230 VAC Model − MIG Welding Gmaw Guidelines Typical MIG Process ConnectionsTypical MIG Process Control Settings Wire Size Amperage RangeThickness to Amperage a Select VoltageHolding And Positioning Welding Gun Conditions That Affect Weld Bead Shape Gun Movement During Welding Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Troubleshooting − Excessive Spatter Troubleshooting − PorosityTroubleshooting − Excessive Penetration Possible Causes Corrective Actions Troubleshooting − Burn-Through Troubleshooting − Lack Of Penetration Troubleshooting − Incomplete Fusion Troubleshooting − Waviness Of Bead Troubleshooting − DistortionApplication Troubleshooting Guide For Semiautomatic Welding EquipmentCommon MIG Shielding Gases Welding arc not stable Wire slipping in drive rolls Return To Table Of Contents − Parts List Main AssemblyDia Part H-10 Gun 195 Optional Drive RollsOptions Page Service SupportContact your Distributor for Hobart Welding Products