Tq Welding

Question 1

What do the letters GTAW represent?

Answer 1

Gas Tungsten Arc Welding

Also known as tungsten inert gas (TIG) welding.

Question 2

List 4 safety considerations when welding.

Answer 2

1. Ventilation - fumes and particulates
2. Electrical Shock
3. Infrared/V Radiation
4. Visible light and Heat Stress

Question 3

List 3 disadvantages of GTAW.

Answer 3

1. Slow speed
2. Lower deposition rates
3. Cannot be performed outside
4. High skill level

Question 4

List 2 advantages of GTAW.

Answer 4

1. High quality welds
2. No sparks or spatter

Can be done on most materials.

Question 5

What are the 2 types of torches used in TIG welding?

Answer 5

1. Air Cooled
2. Water Cooled

Question 6

What is the function of the collet?

Answer 6

Holds/clamps tungsten in place and conducts electricity to the electrode.

Question 7

How are different tungsten identified?

Answer 7

By color.

Question 8

Which tungsten(s) would you use for stainless steel?

Answer 8

2% Thoriated or Zirconium.

Question 10

Which tungsten(s) would you use for aluminum?

Answer 10

Zirconi um, Cer um; Pure tungsten

Question 11

Which shielding gas is most commonly used for TIG welding?

Answer 11

Argon

Question 12

How far should the gas valve on a gas cylinder be opened?

Answer 12

Fully open or Fully closed

Question 13

Flow meters measure gas flow in what units?

Answer 13

Cubic feet per hour

Question 14

How do you identify steel, stainless steel and aluminum rods?

Answer 14

Carbon Steel - ER70S (2 #)
Stainless - ER308L/ (3 #)
Aluminum - ER4043/ (4 #)

Question 15

What metals are usually welded DC?

Answer 15

Mild Steel, S.S.

Question 16

What metals are usually welded with AC?

Answer 16

Aluminum + Magnesium

Question 17

Name the 2 functions of the high frequency current when TIG welding.

Answer 17

Helps Start + Maintain the Arc

Question 19

What direction should the grinding marks run on a sharpened electrode?

Answer 19

longitudinal / Length wise

Question 20

Which material distorts more when welded, mild steel or stainless steel?

Answer 20

Stainless steel

Question 21

Which is the preferred current to weld stainless steel?

Answer 21

DC Straight polarity (DCEN)

Question 22

Stainless steel oxidization is also known as?

Answer 22

Chromium oxide.

Protects Base Metal

Question 23

What is the correct range for gas flow rates when TIG welding stainless steel?

Answer 23

20 CFH - 30 CFH (23 in Shop)

Question 24

Name 2 characteristics that must be considered when welding aluminum.

Answer 24

Oxide layer with low melting point; High heat conductivity

Question 25

How can the surface of aluminum be prepared before welding?

Answer 25

Dirt + oxides can be removed

Question 26

What is the correct torch angle for TIG welding?

Answer 26

15-30 Degrees toward Direction of travel

Question 27

What can cause difficulty in starting the arc when TIG welding aluminum?

Answer 27

Poor ground, High frey turred off

Question 29

What factor can cause porosity in a TIG weld?

Answer 29

Too much or not enough gas.

Question 30

What current setup is used to GTAW weld aluminum?

Answer 30

A/C current.

Question 31

Which metal is a better conductor of heat, stainless steel or aluminum?

Answer 31

Aluminum.

Question 32

What is contamination of the weld zone typically caused by?

Answer 32

Dapping the tungsten into weld probe / a dirty contaminate.

Question 33

Once a tungsten is contaminated, what must be done?

Answer 33

Shall be broken off and re-sharpened.

Question 34

What can be done to minimize the distortion when welding stainless steel or aluminum?

Answer 34

Copper or aluminum chill bars.

Question 35

What is the recommended current type for welding stainless steel?

Answer 35

DCEN.

Question 36

What shielding gas do we use for GTAW on stainless steel, mild steel or aluminum?

Answer 36

Argon.

Question 37

What do flow meters read in?

Answer 37

Cubic feet per hour.

Question 38

When TIG welding, where is the filler rod added?

Answer 38

To the puddle.

Question 39

What is the fastest method of welding stainless steel?

Answer 39

GM AW

Question 40

What is the effect of a finer point on a tungsten when TIG welding stainless steel?

Answer 40

Deeper penetration / Better penetration

Question 41

What can be done to correct incomplete shielding gas coverage to the puddle when TIG welding?

Answer 41

Use larger diameter cup

Question 42

In what positions can GTAW be used?

Answer 42

All positions (horizontal, flat, vertical, overhead)

Question 43

When is GTAW primarily used?

Answer 43

When high-quality welds are required

Question 44

Which material generally requires a higher heat setting for similar thicknesses, stainless or aluminum?

Answer 44

Aluminum