TIG Welding Quiz #1

Ch. 1, 4, 5, and 8

Ch. 1

1.GTAW was invented as an improved process to weld what two materials?

Aluminium and Magnesium

Ch. 1

2. A(n) ______ gas is a gas that does no react chemically with other materials?

Argon and Helium

Ch. 1

3. Before the term gas tungsten are welding (GTAW) came welding society called heliarc process _______.

Tungsten inert gas welding

Ch. 1

4. List the three types of light radiation emitted from arc welding arc?

Infrared light, Visible light, and Ultraviolet light

Ch. 1

5. Which type of light can temporarily impair vision but is otherwise harmless

Visible light

Ch. 1

6. Which light is the most dangerous because it can burn the welder without being felt or seen?

Ultravoliet Light

Ch. 1

7. List the three different degree burns?

First degree, Second degree, and Third degree burns

Ch. 1

8. Which type of burns requires immediate medical attention?

Third degree- burns

Ch. 1

9. When working on the interor components of any welding machine, always _____ primary voltage switches and remove the _____.

Lock out primary voltage switches and remove The Fuse

Ch. 1

10. the greatest potential danger of welding in confined spaces is ____ depletion.

Oxygen Depiction

Ch. 1

11. What does letters PPE stand for?

P: Personal P: Protective E: Equipment

Ch. 1

12. When should safety glasses be worn?

All the time

Ch. 1

13. List the different classifications of the fire extinguishers and the types of fires that each is used to extinguish?

Type A: flammable solids

Type B: Gasoline, oil, paint thinners, and any other flammable

Type C: Electrical fires

Type D: extinguishers for magnesium or titanium

Ch. 1

14. What document contains a manufacture’s specifications and information about hazardous material?

Safety Data Sheet (SDS)

Ch. 1

15. What are the two different type of ventilation

Natural and Force Ventilation

Ch. 1

16. where should you stand when opening a cylinder valve?

Stand on the side of the regulator

Ch. 1

17. Where should shielding gas cylinders be stored?

Cylinder should be stored vertical positions with protective capon

Ch. 1

18. What action(s) should be taken if a cylinders valve is found to have rusty or damaged threads?

Return to the supplier and Never used

Ch. 1

19. The shielding gas in a Dewar Flask is changed from _____ form to ____ form as it passes through heat exchangers.

Change from liquid form to gas form as it passes through heat exchangers

Ch. 1

20. Never use _____ in place of compressed air

Oxygen deprivation

Ch. 4

1. Shielding gases protect the electrode and the molten weld metal from atmospheric _______?

Contamination

Ch. 4

2. List two inert gases used as GTAW shielding gas?

Argon and Helium

Ch. 4

3. What is the most commonly used shielding gas for GTAW?

Argon

Ch. 4

4. Why does helium gas require higher flow rates than argon?

Lighter

Ch. 4

5. Which gas is used as an inexpensive initial purge gas for manifolds, vessels, and pipes?

Nitrogen

Ch. 4

6. Which argon-helium gas mixture is commonly used in GTAW for AC welding of aluminum?

75% Helium and 25% argon

Ch. 4

7. What the most popular argon-hydrogen mixture used for GTAW?

15% hydrogen mixture

Ch. 4

8. Which two metals have extremely low tolerances for contaminate in inert gases?

Titanium and zirconium

Ch. 4

9. Transportable liquefied gas cylinders are commonly called?

Dewar Flask

Ch. 4

10. Gas cylinders and containers should be stored in a(n)’s _____ position.

Upright position

Ch. 4

11. Gases distributed thought a manifold require high-pressure _____ to reduce the pressure from the cylinders to the desired manifold pressure level.

Regulators

Ch. 4

12. What is the usual pressure range for manifolds?

20-50 psi

Ch. 4

13. What is the purpose of reverse flow check valves?

To prevent back flow of the gases and improper mixing

Ch. 4

14. What should you do if a cylinder is not clearly labeled?

Return to gas supplier, never use

Ch. 4

15. what is a certificate of conformance?

It is a statement that a filler metal meets all the requirements of the material specifications

Ch. 4

16. List for different forms of GTAW filer metals.

Spools, Coils, straight length rods, and inserts

Ch. 4

17. The ____ and _____ of welding wire used for automatic welding must be within specification or the wire will cause excessive wear in the wire feeder linear and guide tip.

Cast and Helix

Ch. 4

18. How are straight lengths rode identified?

By numbers stamped n the end of the filler rod

Ch. 4

19. List five substances that can contaminate filler metal.

Oil, moisture, grease, smoke, soot, and salt

Ch. 4

20. Name two degrease used to clean filler wires before use.

alcohol and acetone

Ch. 5

1. Base of the joints configuration, most welds can be classified as either groove welds or ____ weld.

Fillet welds

Ch. 5

2. What are the five basic types of joints?

Butt, T, Lap, Corner, and Edge Joint

Ch. 5

3. ______ joints are used to join two flat pieces of material together edge-to-edge in the same place?

Butt Joints

Ch. 5

4. What are purpose in using a backing bars on butt joints?

Control penetration

Ch. 5

5. What are two advantages of a joggle-type joint compared to a butt joint?

Flanged or stepped

Ch. 5

6. The term ____ refers to over laying weld beads on the surface of metal

Surfacing

Ch. 5

7. An operation known as ___ is often used to build up a weld joint for joining dissimilar

Buttering

Ch. 5

8. What is an autogenous weld?

Welding technique that does use additional filler metal

Ch. 5

9. Whenever the basic weld symbol is placed is above the reference line, where is the weld to be made?

The weld is to be made on the other side of the joint

Ch. 5

10. Of the five basic types of weld joints, which is the strongest?

Butt, T, Lap, Corner, and Edge joints

Ch. 5

11. List three problems commonly encountered when using tack welds during assembly.

1. interfere with final joint penetration into the weld joint

2. Add crown dimension (height)

3. Crack during the welding due to heat and expansion of the joint

Ch.5

12. if the parts of a lap joint are not in close contact, a problem known as ____ can occur.

Bridging

Ch. 5

13. Whenever possible, butt joints should mate at the ____ of the joint

Bottom

Ch. 5

14. Double-groove welds shrink ___ thatn single-groove welds.

More

Ch. 5

15. Are GTAW fillet welds usually concave or convex?

Concave

Ch. 5

16. If a weldment is not being built to handle a specific load what is the rule of thumb should be used to determined the leg length of fillet welds in the weldment?

Fillet legs length must equal to the thickness of the thinnest workpiece in the joint

Ch. 5

17. The area in the base metal next to the weld where grain structure changes occur is called the ____.

Heat-affected zone

Ch. 5

18. In welding terminology, what does dilution mean?

Describes the change from the original chemical composition to another composition with different physical or mechanical properties

Ch. 5

19. What is the purpose of chill bars?

To localize and remove welding heat during the welding operations

Ch. 5

20. Which welding position is represented by the number 4?

Overhead

Ch. 8

1. What are the three classifications of carbon steel?

Low-carbon (mild) steel: less than 0.20%

Medium-carbon steel: 0.20% -0.50%

High-carbon steel: over 0.50% carbon

Ch. 8

2. Medium-carbon steel has a content of ____ carbon

0.20% - 0.50%

Ch. 8

3. List three alloying elements commonly used to maker low-alloy steel?

Chromium, molybdenum, nickel (vandadium and manganese)

Ch. 8

4. What is heat treating?

Heat treating is a process in which the material is heated and cooled to specific temperatures for specific amounts of time

Ch. 8

5. The oxidefilm on the surface of hot-rolled steel is ___ in color?

blue-gray in color

Ch. 8

6. the surface casting that have been sand-blasted are ___ in color.

Dull silver

Ch. 8

7. Why should stainless steel filler metals not be used for welds in service over 1000’ F (538’ C)

Welds subjected over 1000’F will bave carbon migration from the steel to stainless steel, which will cause the weld fail.

Ch. 8

8. List the three finishes available on steel filler metals?

Bright, Oiled and Copper finish

Ch. 8

9. Why must the oxide scale be removed for the edges of thermally cut joints before use?

To prevent porosity in the weld metal

Ch. 8

10. What two types of backing are used for welding steel joint where 100% penetration is required?

Argon gas or solid bar

Ch. 8

11. why is backing used for 100% penetration steel welds?

Exclude our from the a backside or penetration side of the joint

Ch. 8

12. When should carbon steel less than 1” (25.4 mm) thick with less than .30% carbon be pre-heated?

No

Ch. 8

13. A(n) ___ that is too low causes low=alloy steels to have hard heat affected sones after welding

Preheat Temperature

Ch. 8

14. what is the main reason for maintaining a good travel angle?

Can see the weld pool

Ch. 8

15. The welding rod to be added to the weld polished at what angled?

10’ - 20’ from surface of the base metal

Ch. 8

16. Tool steels should be welded with small ___ beads to reduce the amount of heat input and expansion of the base material.

Stringer beads

Ch. 8

17. At what approximate temperature can post weld stress relief of carbon steel weldment be done?

1150’

Ch. 8

18. weds made without any side-to-side movement of the torch are called ___ beads

Weave beads

Ch. 8

19. Welds made without any side-to-side movement of the are called ___ beads.

Stringer beads

Ch. 8

20. When steel is being welded, a small while dot may form on the top of the molten metal, what is the material?

Silicon