Setting Gun Polarity For Wire Type | Hobart Welding Products 250

3-8. Setting Gun Polarity For Wire Type

1
2	3
Ref. ST-192 432

1Polarity Changeover Label

2Positive (+/Red) Output Terminal

3Negative (−/Black) Output Terminal

Always read and follow wire manufacturer’s recommended polarity.

Close door.

Tools Needed: 3/4 in

Ref. 802 285-D

3-9. Installing Wire Spool And Adjusting Hub Tension

Use compression spring with 8 in (200 mm) spools.

When a slight force is needed to turn spool, tension is set.

Tools Needed:

15/16 in

072573-B

OM-192 440 Page 13

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Hobart Welding Products 250 Setting Gun Polarity For Wire Type, Installing Wire Spool And Adjusting Hub Tension

Contents

Processes OM-192 440WDescription File MIG Gmaw From Hobart to You Table of Contents Warranty Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can kill Welding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or kill California 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 Incendie ou une explosion LE Soudage peut provoquer unDES Particules Volantes peuvent blesser les yeux DES Pièces Chaudes peuvent provoquer des brûlures graves LA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU D’EXPLO’EMPLOI Excessif peut SUR DES Organes Mobiles peuvent provoquer des blessures En ce qui concerne les stimulateurs cardiaques Principales normes de sécurité Welding Power Source Duty Cycle And Overheating SpecificationsExceeding duty cycle can damage unit and void warranty Overheating Definition Welding Gun Duty Cycle And OverheatingVolt-Ampere Curves Installing Welding Gun Installing Work Clamp Connecting To Weld Output Terminals Installing Wire Spool And Adjusting Hub Tension Setting Gun Polarity For Wire Type Rear Panel Installing Gas Supply Volts Positioning Jumper Links Hz Single Electrical Service GuideInput Voltage Min Grounding Conductor Size In AWG Selecting a Location And Connecting Input Power Wood Threading Welding Wire Operation Turn Off unit, and disconnect input power Turn Off unit Connecting Spool Gun To Welding Power Source Controls − Operation While welding Voltage switch positionWeld Parameters Number on left of slash To read settingsExample 2/40 = Disconnect power before maintaining Routine MaintenanceSupplementary Protectors Months Removing Knob From Front Panel Replacing Drive Roll And Wire Inlet GuideTurn Off power Replacing Gun Contact Tip Turn Off power before replacing contact tip Wire size stamped on tip − check and match wire size Turn off welding power source/wire feeder Replacing Switch And/Or Head Tube Wire Drive/Gun Troubleshooting Table Welding Troubleshooting TableWire Drive/Gun Trouble Remedy Welding Trouble Remedy Typical MIG Process Connections − MIG Welding Gmaw Guidelines Wire Size Amperage Range Typical MIG Process Control SettingsThickness to Amperage a Amperage Holding And Positioning Welding Gun Conditions That Affect Weld Bead Shape Gun Movement During Welding Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Troubleshooting − Porosity Troubleshooting − Excessive SpatterTroubleshooting − Excessive Penetration Possible Causes Corrective Actions Troubleshooting − Burn-Through Troubleshooting − Lack Of PenetrationTroubleshooting − Incomplete Fusion Troubleshooting − Distortion Troubleshooting − Waviness Of Bead Wire does not feed Troubleshooting Guide For Semiautomatic Welding EquipmentCommon MIG Shielding Gases Application Welding arc not stable Wire slipping in drive rolls OM-192 440 − Electrical Diagram − Parts List REGULATOR/FLOWMETER, 10−50 CFH ARGON/CO2 Center Baffle w/Components Center Baffle w/Components -1Item Rear Panel w/Components Front Panel w/Components M-25 Gun Description Remarks Optional Spool Gun SwitchPage Assistance ServiceSupport Hobart Welding Products Contact your Distributor for