Hobart Welding Products 140 manual Process/Polarity Table, Changing Polarity

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.A complete Parts List is available at www.HobartWelders.com

5-3. Process/Polarity Table

Process	Polarity	Cable Connections
Process	Polarity
		Cable To Gun	Cable To Work

GMAW − Solid wire with shield-	DCEP − Reverse polarity	Connect to positive (+) out-	Connect to negative (−) output
ing gas		put terminal	terminal

FCAW − Self-shielding wire −	DCEN − Straight Polarity	Connect to negative (−)	Connect to positive (+) output
no shielding gas		output terminal	terminal

5-4. Changing Polarity

CHANGING

POLARITY

DCEN

Electrode negative for

flux cored wire

DCEP

Electrode positive for

solid wire

1Lead Connections For Direct Current Electrode Negative (DCEN)

2Lead Connections For Direct Current Electrode Positive (DCEP)

Always read and follow wire

manufacturer’s recommended polarity, and see Section 5-3.

Close door.

Ref. 209 228 / Ref. 209 229 / Ref. 803 714-A

OM-925 Page 13

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Contents Description OM-925Processes From Hobart to You Table of Contents Typical MIG Process Connections − ACCESSORIES/CONSUMABLES− MIG Welding Gmaw Guidelines Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killCalifornia Proposition 65 Warnings About Pacemakers Principal Safety StandardsEMF Information Indique un message de sécurité particulier UNE Décharge Électrique peut entraîner la mortLES Fumées ET LES GAZ peuvent être dangereux DES Particules Volantes peuvent blesser les yeux LE Soudage peut provoquer un incendie ou une explosionDES Pièces Chaudes peuvent provoquer des brûlures graves LE Bruit peut endommager l’ouïeLA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU D’EXPLO’EMPLOI Excessif peut SUR DES Organes Mobiles peuvent provoquer des blessuresEn ce qui concerne les stimulateurs cardiaques Boulevard, Rexdale, Ontario, Canada M9W 1R3 téléphoneSymbols And Definitions − SpecificationsSpecifications − DefinitionsDuty Cycle And Overheating WarrantyOutput Duty Cycle % Exceeding duty cycle canVoltage Volt-Ampere Curves15.0 10.0 100 110 120 130 140 150 160Installing Welding Gun − InstallationInstalling Work Clamp Drive assembly. Tighten thumbscrewChanging Polarity Process/Polarity TableCO2 gas regulator/flowmeter Installing Gas SupplyDo not move or operate unit Where it could tip Selecting a Location And Connecting Input PowerAlign locking hole in spool with locking pin on spool hub Installing Wire Spool And Adjusting Hub TensionUse with solid or flux cored wire Installing Contact Tip And NozzleTurn off welding power source Lay gun cable out straight Threading Welding WireTighten Pressure Indicator ScaleControls Source or -2. Do not switch under load− Operation Material Thickness Reference Chart Weld Parameter Chart 217 618-A Routine Maintenance − Maintenance & TroubleshootingDisconnect power Overload Protection Drive Motor ProtectionTurn Off power before replacing contact tip Changing Drive Roll Or Wire Inlet GuideReplacing Gun Contact Tip Tools Needed 030/.035 GrooveTo Reassemble Gun Cleaning Or Replacing Gun LinerDisconnect gun from unit Slide handle Replacing Switch And/Or Head TubeRemove handle locking nut Secure head tube in vice Trouble Remedy Troubleshooting TableCircuit Diagram − Electrical DiagramTypical MIG Process Connections − MIG Welding Gmaw GuidelinesWire Size Amperage Range Typical MIG Process Control SettingsThickness to Amperage a Select VoltageHolding And Positioning Welding Gun Push 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 Application Troubleshooting Guide For Semiautomatic Welding EquipmentCommon MIG Shielding Gases Readjust welding parameters Welding arc not stable Wire slipping in drive rollsWelding power source Drive rolls if necessaryAccessories − ACCESSORIES/CONSUMABLESReplacement Drive Rolls ConsumablesWork like a Pro Start Your Professional Assistance ServiceSupport Hobart Welding Products Contact your Distributor for