GTAW

Question 1

What is TIG Welding?

Answer 1

Uses a non-consumable tungsten electrode and shielding gas

TIG stands for Gas Tungsten Arc Welding, known for producing high-quality welds.

Question 2

What are the advantages of TIG Welding?

Answer 2

High-quality welds, suitable for thin materials, no spatter

These characteristics make it ideal for precision applications.

Question 3

What are the disadvantages of TIG Welding?

Answer 3

Slower process, requires skill, higher cost

These factors may limit its use in high-volume production.

Question 4

List some applications of TIG Welding.

Answer 4

• Aerospace
• Automotive
• Piping
• Precision welding

TIG Welding is often used in industries where high-quality welds are critical.

Question 5

What is a key feature of a TIG Welding machine?

Answer 5

AC/DC compatibility for various metals

This allows for versatility in welding different materials.

Question 6

What types of tungsten electrodes are used in TIG Welding?

Answer 6

• Pure tungsten
• Thoriated
• Ceriated
• Lanthanated

Each type has specific applications and characteristics.

Question 7

What color code represents pure tungsten electrodes?

Answer 7

Green

This color code indicates the type of tungsten used in the electrode.

Question 8

What is the universal shielding gas used in TIG Welding?

Answer 8

Argon

Argon provides a stable arc and is suitable for most welding applications.

Question 9

What is one advantage of using helium as a shielding gas?

Answer 9

Improves penetration and heat

Helium is often mixed with argon for specific applications.

Question 10

What should filler materials in TIG Welding match?

Answer 10

Base metal composition

This ensures compatibility and quality of the weld.

Question 11

What are the key components of a TIG torch setup?

Answer 11

• Collet
• Gas lens
• Nozzle

Proper setup is crucial for achieving a stable arc and gas flow.

Question 12

What is the scratch start technique in TIG Welding?

Answer 12

Dragging electrode to strike the arc

This method is one of the ways to initiate an arc.

Question 13

What is the purpose of using a foot pedal in TIG Welding?

Answer 13

Precise heat control

This allows the welder to adjust the heat input dynamically.

Question 14

What is the dip method for adding filler metal?

Answer 14

Intermittent feeding for small, precise welds

This method is useful for controlling the amount of filler added.

Question 15

What current type is used for welding aluminum in TIG?

Answer 15

AC current

AC current is necessary to clean the oxide layer on aluminum.

Question 16

What is the significance of DCEN in TIG Welding?

Answer 16

Focused heat on workpiece; ideal for most metals

DCEN stands for Direct Current Electrode Negative.

Question 17

What does balance control in AC TIG Welding adjust?

Answer 17

Oxide cleaning vs. penetration

This adjustment is crucial for effective welding of aluminum.

Question 18

What is the typical range for shielding gas flow rates in TIG Welding?

Answer 18

10-20 CFH

Adjustments may be necessary based on joint type and material thickness.

Question 19

What is a common defect in TIG Welding caused by contamination?

Answer 19

Porosity

Ensuring clean surfaces is essential to prevent this defect.

Question 20

What personal protective equipment (PPE) is essential for TIG Welding?

Answer 20

• Heat-resistant gloves
• Welding helmets
• Protective clothing

Proper PPE protects against heat and radiation hazards.

Question 21

True or False: TIG Welding requires the use of a lens shade typically between 10-13.

Answer 21

True

This range protects the eyes from harmful UV and IR radiation.