Miller Electric HF-251D-1, HF-251-2 manual Amperage Range Gas Type Polarity, AC − Argon AC − Argon

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SECTION 8 − SELECTING AND PREPARING TUNGSTEN

ELECTRODE FOR DC OR AC WELDING

ac/dc_gtaw 2/2004

Y Whenever possible and practical, use DC weld output instead of AC weld output.

8-1. Selecting Tungsten Electrode (Wear Clean gloves To Prevent Contamination Of Tungsten)

 

 

Amperage Range - Gas Type♦ - Polarity

 

 

 

 

 

 

 

Electrode Diameter

DC − Argon − Electrode

DC − Argon − Elec-

 

AC − Argon

AC − Argon −

 

Negative/Straight Po-

trode Positive/Rev-

 

Balanced Wave

 

larity

erse Polarity

 

 

 

 

 

 

 

 

 

 

 

 

2% Ceria (Orange Band), 1.5% Lan-

 

 

 

 

 

thanum (Gray Band), Or 2% Thorium

 

 

 

 

 

(Red Band) Alloy Tungstens

 

 

 

 

 

 

 

 

 

 

 

.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

 

 

 

 

 

 

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

 

 

 

 

 

 

Zirconium Alloyed Tungsten (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.

 

Figures listed are a guide and are a composite of recommendations from American Welding Society (AWS) and electrode manufacturers. OM-611 Page 24

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Contents
Processes OM-611Description 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 EMF Information Principal Safety StandardsAbout Pacemakers Identifie un message de sécurité particulier − Consignes DE Sécurité − À Lire Avant UtilisationLE 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 blessuresInformation sur les champs électromagnétiques Principales normes de sécuritéConsignes relatives aux stimulateurs cardiaques Specifications − InstallationTypical Process Connections Installing Gas Supply IN-GAS-OUTPower Source Plug Information And Connections Amperage ControlOperator Control Receptacle Socket Information Operator Control Receptacle Information And ConnectionsSocket Connecting To Weld Output Terminals Electrode Electrode OUT Work INPUT/OUTPUTConnecting Input Power High Frequency Switch High Frequency Selector Switch− Operation ControlsPower Switch And Pilot Light Postflow TimerHigh Frequency Intensity Control Shielding Gas− Maintenance & Troubleshooting Routine Maintenance MonthsAdjusting Spark Gaps Troubleshooting Trouble Remedy− Electrical Diagrams Circuit Diagram For 115 Volts ModelCircuit Diagram For 230 Volts Model Incorrect Installation − High FrequencyWelding Processes Requiring High Frequency Weld ZoneMetal Building Correct InstallationMetal Building Requirements Amperage Range Gas Type Polarity AC − Argon AC − Argon −− Guidelines for TIG Welding Gtaw Preparing Tungsten Electrode For WeldingPositioning The Torch Preparing Tungsten For Conventional AC WeldingTorch Movement During Welding Positioning Torch Tungsten For Various Weld JointsTungsten Without Filler Rod Tungsten With Filler RodReturn To Table Of Contents − Parts List Complete Assembly Part 1 of 2 115V ModelComplete Assembly Part 1 Complete Assembly Part 2 of 2 115V Model Complete Assembly Part 2 Page Page Page Service SupportOwner’s Record Miller Electric Mfg. Co