Hobart Welding Products 250 installation instructions Replacing Gun Contact Tip

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5-5. Replacing Gun Contact Tip

Y Turn Off power before replacing contact tip.

1 Nozzle

2 Contact Tip

Cut off welding wire at contact tip. Remove nozzle.

Remove contact tip and install new contact tip. Reinstall nozzle.

2

1

Tools Needed:

Ref. 800 797-C

OM-192 440 Page 26

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Contents Description OM-192 440WProcesses File MIG GmawFrom Hobart to You Table of Contents Warranty Arc Welding Hazards Symbol UsageMarks a special safety message Electric Shock can killFlying Metal can injure eyes ARC Rays can burn eyes and skinWelding can cause fire or explosion Buildup of GAS can injure or killCalifornia Proposition 65 Warnings Principal Safety Standards EMF InformationAbout Pacemakers UNE Décharge Électrique peut entraîner la mort LES Fumées ET LES GAZ peuvent être dangereuxIndique un message de sécurité particulier DES Particules Volantes peuvent blesser les yeux LE Soudage peut provoquer unIncendie ou une explosion DES Pièces Chaudes peuvent provoquer des brûlures graves’EMPLOI Excessif peut SUR Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessuresPrincipales normes de sécurité En ce qui concerne les stimulateurs cardiaquesExceeding duty cycle can damage unit and void warranty SpecificationsWelding Power Source Duty Cycle And Overheating OverheatingWelding Gun Duty Cycle And Overheating Volt-Ampere CurvesDefinition Installing Welding Gun Connecting To Weld Output Terminals Installing Work ClampSetting Gun Polarity For Wire Type Installing Wire Spool And Adjusting Hub TensionInstalling Gas Supply Rear PanelPositioning Jumper Links VoltsInput Voltage Electrical Service GuideHz Single Min Grounding Conductor Size In AWGSelecting a Location And Connecting Input Power Threading Welding Wire WoodTurn Off unit, and disconnect input power OperationConnecting Spool Gun To Welding Power Source Turn Off unit− Operation ControlsVoltage switch position Weld ParametersWhile welding To read settings Example 2/40 =Number on left of slash Supplementary Protectors Routine MaintenanceDisconnect power before maintaining MonthsReplacing Drive Roll And Wire Inlet Guide Turn Off powerRemoving Knob From Front Panel Turn Off power before replacing contact tip Replacing Gun Contact TipTurn off welding power source/wire feeder Wire size stamped on tip − check and match wire sizeReplacing Switch And/Or Head Tube Wire Drive/Gun Trouble Remedy Welding Troubleshooting TableWire Drive/Gun Troubleshooting Table Welding Trouble Remedy− MIG Welding Gmaw Guidelines Typical MIG Process ConnectionsThickness to Amperage a Typical MIG Process Control SettingsWire Size Amperage Range AmperageHolding And Positioning Welding Gun Conditions 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 − DistortionCommon MIG Shielding Gases Troubleshooting Guide For Semiautomatic Welding EquipmentWire does not feed ApplicationWelding 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 Optional Spool Gun Switch Description RemarksPage Service SupportAssistance Contact your Distributor for Hobart Welding Products