1. Teknologi Dan Rekayasa
TUNGSTEN INERT GAS WELDING
(TIG / GTAW)

2. TIG WELDING EQUIPMENT Objective :
After studying this lesson, the students can be identify of equipment for TIG welding.
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3. TIG WELDING EQUIPMENT Understanding :
TIG welding is one types of gas shielded arc welding processes, is called Gas Tungsten Arc Welding (GTAW).
During the welding cycle a shield of inert gas expels the air from the welding area and prevents oxidation of the electrode, weld puddle, and surrounding heat affected zone.
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4. TIG WELDING EQUIPMENT Fig. 1. TIG Welding Process
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5. The general of TIG welding equipment are three kinds : Main equipment
Health and safety equipment
Assist equipment
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6. The main equipment for TIG welding consist of : Power supply
TIG WELDING EQUIPMENT
The main equipment for TIG welding consist of :
Power supply
Electrode holder (torch)
Non-consumable electrode
Gas regulator
Shielding Gas
Protective Shield
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7. TIG WELDING EQUIPMENT Fig. 2. Schema of TIG welding
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8. THE MAIN TIG WELDING EQUIPMENT
Power supply
Gas tungsten arc power supply units are AC or DC machines.
The choice of an AC or DC welder depends on certain distinct weld characteristics that may be required.
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9. THE MAIN TIG WELDING EQUIPMENT
Fig.3. Power Supply
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10. THE MAIN TIG WELDING EQUIPMENT
2. Electrode Holder (Torch) Welding torches are constructed to conduct both the welding current and the inert gas to the weld zone.
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11. THE MAIN TIG WELDING EQUIPMENT
Cap electrode
Tungsten
Nozzle
Collet
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12. THE MAIN TIG WELDING EQUIPMENT
Fig. 4. Torch
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13. THE MAIN TIG WELDING EQUIPMENT
3. Non Consumable Electrodes
Basic diameters of non consumable electrodes are 1/16”, 3/12”, and 1/8”.
They are either pure tungsten or alloyed tungsten.
The alloyed tungsten usually have one to two percent thorium or zirconium.
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14. THE MAIN TIG WELDING EQUIPMENT
Fig. 5. Tungsten electrode
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15. THE MAIN TIG WELDING EQUIPMENT
4. Gas Regulators
Gas flow is regulated by a single or dual stage pressure reducing regulator and flow meter.
The flow meter is calibrated in cubic feet per hour (cfh) or liters per minute (lpm).
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16. THE MAIN TIG WELDING EQUIPMENT
Flowmeter
Regulator
Fig. 6. Regulator Flowmeter
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17. THE MAIN TIG WELDING EQUIPMENT
5. Shielding Gas
Shielding gas for TIG welding can be argon, helium or a mixture of argon and helium.
a. Argon :
Argon is used more extensively because it is less expensive than helium.
Argon a better cleaning action especially in welding aluminum and magnesium with AC.
Argon also permits better control of the arc in vertical and overhead welding.
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18. THE MAIN TIG WELDING EQUIPMENT
b. Helium Helium is sometimes used in welding heavy materials and metals having. c. Argon and helium A mixture of argon and helium is often used in welding metals that require a higher heat input.
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19. THE MAIN TIG WELDING EQUIPMENT
6. Protective shield
A suitable helmet or handshield is required for all arc welding.
An electric arc produces a brilliant light and also gives invisible ultraviolet and infrared rays which are extremely dangerous to the eyes and skin.
Both the helmet and hand shield are equipped with special colored lenses that reduce the brilliancy of the light and screen out the infrared and ultraviolet rays.
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20. THE MAIN TIG WELDING EQUIPMENT
Lenses come in different shades and the types used depends on the kind of welding done.
In general, the recommended practice is:
Shade 5 : for light spot welding
Shade 6 and 7: for welding up to 30 amperes
Shade 8 : for welding 30 to 75 amperes
Shade 10 : for welding 75 to 200 amperes
Shade 12 : for welding 200 to 400 amperes
Shade 14 : for over 400 amperes
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21. THE MAIN TIG WELDING EQUIPMENT
Lens
Clear lens
Filter lens
Fig. 9. Protective Shielded
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22. HEALTH AND SAFETY EQUIPMENT
1. WELD CLOTHES
2. APPRON (CHEST PROTECTOR)
3. GLOVES
4. LEATHER SHOES

23. HEALTH AND SAFETY EQUIPMENT
1. Weld Clothes
By wearing this clothes, welder will fill comfort and free in movement

24. HEALTH AND SAFETY EQUIPMENT
2. Apron
(Chest protector)
Appron is used to protect welder chest from UV ray, infra red, weld fire work sprinkling and the hot of welding.

25. HEALTH AND SAFETY EQUIPMENT
3. Gloves
Gloves it used to protect welder hand from electricity, the of welding and sharp material.

26. HEALTH AND SAFETY EQUIPMENT
4. Leather Shoes
This shoes made of leather that there is metal in top of it, this shoes will protect welder from electricity, downfall material, hot material and sharp material.

27. ASSIST TIG WELDING EQUIPMENT
1. Ground Clamp A very important unit of any electrical welding equipment is the ground clamp. Without proper grounding the full potential of the circuit will fail to provide the required heat for welding
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28. ASSIST TIG WELDING EQUIPMENT
2. Smeed Tang
Smeed tang is used to held the hot base metal

29. ASSIST TIG WELDING EQUIPMENT
3. Scratch brushes
Scratch brushes is used to clean the base metal before welding

30. The end
Thank you
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