Hobart Welding Products 250 instruction

5-6. Removing Nozzle, Contact Tip, And Adapter, Changing Liner, And Cleaning Gun Casing

2	3	4
	3

		Head
1		Tube
1

7/16 in

5/8 in

Remove nozzle, contact tip, and adapter.

Blow out gun casing.

3/4 in

(20 mm)

Liner

Stickout

Tools Needed:

5/8, 7/16 in

YTurn off welding power source/wire feeder.

1Nozzle

2Contact Tip

3Tip Adapter

4Nozzle Adapter

.Wire size stamped on tip − check and match wire size.

Cut off wire and disconnect gun from feeder.

Unscrew and remove liner.

Lay gun cable out straight before installing new liner.

Reassemble gun in reverse order from taking it apart.

Install

Liner

.Thread wire according to

welding power source/wire feeder manual.

804 466-A

OM-192 440 Page 27

Image 31

Hobart Welding Products 250 installation instructions Turn off welding power source/wire feeder

Contents

File MIG Gmaw OM-192 440WProcesses Description From Hobart to You Table of Contents Warranty Electric Shock can kill Symbol UsageMarks a special safety message Arc Welding Hazards Buildup of GAS can injure or kill ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal can injure eyes California Proposition 65 Warnings EMF Information Principal Safety StandardsAbout Pacemakers LES Fumées ET LES GAZ peuvent être dangereux UNE Décharge Électrique peut entraîner la mortIndique un message de sécurité particulier DES Pièces Chaudes peuvent provoquer des brûlures graves LE Soudage peut provoquer unIncendie ou une explosion DES Particules Volantes peuvent blesser les yeux DES Organes Mobiles peuvent provoquer des blessures Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peut SUR En ce qui concerne les stimulateurs cardiaques Principales normes de sécurité Overheating SpecificationsWelding Power Source Duty Cycle And Overheating Exceeding duty cycle can damage unit and void warranty Volt-Ampere Curves Welding Gun Duty Cycle And OverheatingDefinition 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 Min Grounding Conductor Size In AWG Electrical Service GuideHz Single Input Voltage 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 Weld Parameters Voltage switch positionWhile welding Example 2/40 = To read settingsNumber on left of slash Months Routine MaintenanceDisconnect power before maintaining Supplementary Protectors Turn Off power Replacing Drive Roll And Wire Inlet GuideRemoving Knob From Front Panel 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 Welding Trouble Remedy Welding Troubleshooting TableWire Drive/Gun Troubleshooting Table Wire Drive/Gun Trouble Remedy Typical MIG Process Connections − MIG Welding Gmaw Guidelines Amperage Typical MIG Process Control SettingsWire Size Amperage Range Thickness to Amperage a Holding And Positioning Welding Gun Conditions That Affect Weld Bead Shape Good Weld Bead Characteristics Poor Weld Bead CharacteristicsGun Movement During Welding Possible Causes Corrective Actions Troubleshooting − Excessive SpatterTroubleshooting − Porosity Troubleshooting − Excessive Penetration Troubleshooting − Incomplete Fusion Troubleshooting − Lack Of PenetrationTroubleshooting − Burn-Through Troubleshooting − Distortion Troubleshooting − Waviness Of Bead Application Troubleshooting Guide For Semiautomatic Welding EquipmentWire does not feed Common MIG Shielding Gases 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 Support ServiceAssistance Hobart Welding Products Contact your Distributor for