Miller Electric CST 250 VRD manual Tungsten Electrode

Page 32

7-3. Preparing Tungsten For AC Or DC Electrode Negative (DCEN) Welding

 

 

1

Tungsten Electrode

1

2

2

Tapered End

 

 

Grind end of tungsten on fine grit,

 

 

hard abrasive wheel before weld-

 

 

ing. Do not use wheel for other jobs

 

 

or tungsten can become contami-

 

 

nated causing lower weld quality.

 

2-1/2 Times

 

 

 

Electrode Diameter

 

 

 

 

1

Stable Arc

 

1

2

Flat

 

Diameter of this flat determines

 

 

 

2

amperage capacity.

 

3

Grinding Wheel

 

 

 

3

Grinding wheel should be dedi-

 

 

cated to grinding tungsten only.

 

 

4

Straight Ground

 

4

 

 

Ideal Tungsten Preparation − Stable Arc

 

 

 

 

1

Arc Wander

 

1

2

Point

 

3

Grinding Wheel

 

 

 

 

Grinding wheel should be dedi-

 

2

cated to grinding tungsten only.

 

4

Radial Ground

 

 

 

3

 

 

 

4

 

 

Wrong Tungsten Preparation − Wandering Arc

 

 

 

 

 

Ref. S-0161 / Ref. S-0162

OM-220 812 Page 28

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Contents Description OM-220 812BProcesses From Miller to You Table of Contents Page 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 Signification des symboles − Consignes DE Sécurité − À Lire Avant UtilisationLES Décharges Électriques peuvent être mortelles LES Fumées ET LES GAZ peuvent être dangereuxLE 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 Duty Cycle And Overheating − InstallationSpecifications Stick Smaw Volt-Ampere Curves DC AmpsTIG Gtaw Volt-Ampere Curve Location And Airflow Dimensions And WeightSelecting a Location Weld Output Terminals And Selecting Cable Sizes 150 ft 200 ft 250 ft350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m Terminals AmperesPositive + Weld Output Terminal Electrical Service Guide 50/60 Hz Single-Phase 50/60 Hz Three-PhaseStick Dcep Direct Current Electrode Positive Connections Input VoltageSelecting 220 Volts AC Single/Three Phase Input Voltage Selecting 400 440 Volts AC Three Phase Input Voltage Relinking Board Connection For 400 440 VAC Input PowerConnecting Input Power For three-phase operationFor single-phase operation = GND/PE− Operation ControlsProcess Select Control Lift-ArctTIG NormalStick Start Procedure − Scratch Start Technique Lift-ArcStart ProcedureLift-Arc Start ApplicationAmp Adjust Control Remote 14 Receptacle InformationFan-On-Demand Rack Mounting− Maintenance and Troubleshooting Routine MaintenanceBlowing Out Inside Of Unit MonthsTroubleshooting Trouble Possible Causes RemedyUse proper size and type of weld cable see Section − Electrical Diagrams Circuit DiagramSelecting Tungsten Electrode Safety Information About Tungsten− Selecting and Preparing Tungsten Electrode Tungsten Electrode OM-220 812 − Parts List Main AssemblyCAPACITOR,ELCTLT 2400 UF 500 VDC can 2.5 DIA Panel, Front w/Components Panel, Rear w/Components Magnetics Subassembly Heat Sink Assembly, Output Diode Base Assembly Heat Sink Assembly, Input Page Service SupportOwner’s Record Miller Electric Mfg. Co
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