Miller Electric MARK VIII-2 manual Selecting and Preparing Tungsten Electrode

Page 32

SECTION 8 − SELECTING AND PREPARING

TUNGSTEN ELECTRODE

gtaw 7/97

NOTE

For additional information, see your distributor for a handbook on the Gas Tungsten Arc Welding (GTAW) process.Wear clean gloves to prevent contamination of tungsten electrode.

8-1. Selecting Tungsten Electrode

 

 

Amperage Range - Gas Type♦ - Polarity

 

 

 

 

 

 

Electrode Diameter

DC − Argon − Electrode

DC − Argon − Electrode

AC − Argon − Using

AC − Argon − Balanced

 

Negative/Straight Polarity

Positive/Reverse Polarity

High Frequency

Wave Using High Freq.

 

 

 

 

 

Pure Tungsten

 

 

 

 

(Green Band)

 

 

 

 

 

 

 

 

 

.010”

Up to 15

*

Up to 15

Up to 10

.020”

5-20

*

5-20

10-20

.040”

15-80

*

10-60

20-30

1/16”

70-150

10-20

50-100

30-80

3/32”

125-225

15-30

100-160

60-130

1/8”

225-360

25-40

150-210

100-180

5/32”

360-450

40-55

200-275

160-240

3/16”

450-720

55-80

250-350

190-300

1/4”

720-950

80-125

325-450

250-400

 

 

 

 

 

2% Thorium Alloyed

 

 

 

 

Tungsten (Red Band)

 

 

 

 

 

 

 

 

 

.010”

Up to 25

*

Up to 20

Up to 15

.020”

15-40

*

15-35

5-20

.040”

25-85

*

20-80

20-60

1/16”

50-160

10-20

50-150

60-120

3/32”

135-235

15-30

130-250

100-180

1/8”

250-400

25-40

225-360

160-250

5/32”

400-500

40-55

300-450

200-320

3/16”

500-750

55-80

400-500

290-390

1/4”

750-1000

80-125

600-800

340-525

 

 

 

 

 

Zirconium Alloyed Tung-

 

 

 

 

sten (Brown Band)

 

 

 

 

 

 

 

 

 

.010”

*

*

Up to 20

Up to 15

.020”

*

*

15-35

5-20

.040”

*

*

20-80

20-60

1/16”

*

*

50-150

60-120

3/32”

*

*

130-250

100-180

1/8”

*

*

225-360

160-250

5/32”

*

*

300-450

200-320

3/16”

*

*

400-550

290-390

1/4”

*

*

600-800

340-525

 

 

 

 

 

♦Typical argon shielding gas flow rates are 15 to 35 cfh (cubic feet per hour). *Not Recommended.

The figures listed are intended as a guide and are a composite of recommendations from American Welding Society (AWS) and electrode manufacturers.

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Contents OM-218 DescriptionFrom 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 Indique un message de sécurité particulier UNE Décharge Électrique peut entraîner la mortLES Fumées ET LES GAZ peuvent être dangereux LE Soudage peut provoquer un Incendie ou une explosionDES Particules Volantes peuvent blesser les yeux DES Pièces Chaudes peuvent provoquer des brûlures gravesRisque D’INCENDIE OU D’EXPLO LA Chute DE L’APPAREIL peut blesser’EMPLOI Excessif peut SUR DES Organes Mobiles peuvent provoquer des blessuresPrincipales normes de sécurité En ce qui concerne les stimulateurs cardiaques− Specifications SpecificationsVolt-Ampere Curves Amperes Input at Rated Load Output, 60 HzDuty Cycle And Overheating For Each Module And Total SystemFor Main Transformer Overheating− Installation Selecting a Location And Moving Polyweld SystemMovement Location And AirflowDimensions, Weights And Base Mounting Hole Layout DimensionsWeight Selecting And Preparing Weld Output Cables350 ft 400 ft 15m 30m 45 m 60 m 70 m 90 m 105 m 120 m Weld Cable Size150 ft 200 ft 250 ft Connecting Weld Output Cables Connecting To Weld Output TerminalsRead Safety Blocks at start of -6before proceeding Standard Module ConnectionsCommon Work Cable Size Separate Work ConnectionsParallel Module Connections Separate Work Connections Common WorkRemote Amperage Control Receptacle Remote Contactor Control Connections OptionalConnecting Input Power Volts AC Duplex ReceptaclePositioning Jumper Links TE3 TE2Connecting Input Power Welding Power Source Input Power Con- nectionsClose and secure access door on welding power source Disconnect Device Input Power Connec- tionsElectrical Service Guide Time-Delay− Operation ControlsAmperage Adjustment Controls Power Switch Push Buttons And Pilot LightMin 35 a Max 125 a Set Switch Set Desired Maximum Amperage Hz Model Shown− Maintenance & Troubleshooting Routine MaintenanceMonths Overload ProtectionModule Fuse Links F11 And F12 Through F81 And F82 Blank Module PanelControl Fuses F3 And F4 Before inspecting, maintaining, or servicing TroubleshootingTurn Off polyweld system, and disconnect input power OM-218 − Electrical Diagram Circuit Diagram For Polyweld SystemSD-082 527-C Amperage Range Gas Type Polarity − Selecting and Preparing Tungsten ElectrodeSelecting Tungsten Electrode Preparing Tungsten For DC Electrode Negative Dcen Welding Torch Movement During Welding − Guidelines for TIG Welding GtawPositioining The Torch Positioning Torch Tungsten For Various Weld Joints Butt Weld And Stringer Bead Joint Lap Joint Corner Joint− Parts List Main Assembly Section aTP1 Main Assembly Section B CR1 194 Panel, Front Module w/Components -1Item Panel, Front Lower w/Components -1Item Panel, Front Lower w/ComponentsPage Support ServiceYour distributor also gives To locate a Distributor or Service Agency visit Miller Electric Mfg. CoFor assistance in filing or settling claims, contact Your distributor and/or equipment manufacturer’s
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