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Guidelines To Gas Tungsten Arc Welding (GTAW)

 

TABLE OF CONTENTS
SECTION 1 − SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SECTION 2 − THE TIG PROCESS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2-1. What Is TIG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2-2. GTAW (TIG) Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2-3. TIG Advantages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2-4. TIG Disadvantages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2-5. AC Sine Wave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2-6. Zero Crossover Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2-7. Squarewave Imposed Over A Sinewave . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2-8. Conventional Squarewave AC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SECTION 3 − ARC SHAPING CAPABILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3-1. Arc Starting Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3-2. Balance Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3-3. AC Frequency Adjustment Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3-4. Amperage Adjust Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3-5. Frequency Adjustment Control − 60 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3-6. Frequency Adjustment Control − 200 Hz . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3-7. Suggested Inverter Power Source Starting Parameters For Various
. . . Aluminum Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3-8. Suggested Inverter Power Source Starting Parameters For Various
. . . Aluminum Joints (Continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SECTION 4 − TUNGSTEN SELECTION AND PREPARATION . . . . . . . . . . . . 11
4-1. Safety Information And Selecting Tungsten Electrodes . . . . . . . . . . . . . . 11
4-2. Selecting A Tungsten Electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4-3. Proper Tungsten Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4-4. More About Tungsten Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4-5. Tungsten Shape For AC Sine Wave & Conventional Squarewave . . . . . 13
4-6. Tungsten Shape For Inverter AC & DC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
SECTION 5 − TIG SHIELDING GASES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5-1. TIG Shielding Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5-2. Argon vs. Helium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5-3. Argon/Helium Mixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SECTION 6 − GUIDELINES FOR GTAW WELDING (TIG) . . . . . . . . . . . . . . . . 16
6-1. Lift-Arc And HF TIG Start Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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