Other Skilled Trades Welding 2 — Questions and Answers
Question 1: What does TIG stand for in TIG welding?
- Tungsten Inert Gas (Correct answer)
- Titanium Induction Gas
- Thermal Integrated Grounding
- Tungsten Integrated Groove
Correct answer: Tungsten Inert Gas
TIG stands for Tungsten Inert Gas, a welding process that uses a non-consumable tungsten electrode and a separate filler rod, shielded by an inert gas.
Question 2: What is the correct shade number for a welding lens when MIG welding at 200 amps?
- Shade 8
- Shade 10 (Correct answer)
- Shade 12
- Shade 14
Correct answer: Shade 10
AWS recommends shade 10 for MIG welding in the 150–250 amp range to protect the eyes from the intense arc light.
Question 3: What type of weld symbol on a blueprint indicates a weld all around the joint?
- An arrow pointing downward
- A circle at the junction of the arrow and reference line (Correct answer)
- A filled triangle
- A dashed line below the reference line
Correct answer: A circle at the junction of the arrow and reference line
A small circle at the junction of the arrow line and reference line on a weld symbol means the weld is to be made all around the joint.
Question 4: Which defect is caused by insufficient fusion between the weld metal and the base metal?
- Porosity
- Undercut
- Incomplete fusion (Correct answer)
- Overlap
Correct answer: Incomplete fusion
Incomplete fusion occurs when the weld metal does not properly bond to the base metal or previous weld passes, creating a weak joint.
Question 5: What is the function of flux in Stick (SMAW) welding electrodes?
- To add filler metal to the joint
- To provide electrical conductivity
- To generate shielding gas and slag to protect the weld pool (Correct answer)
- To increase amperage
Correct answer: To generate shielding gas and slag to protect the weld pool
The flux coating on SMAW electrodes burns during welding to create shielding gases and a protective slag layer that shields the molten weld pool from atmospheric contamination.
Question 6: What is the minimum safe distance to store oxygen and acetylene cylinders apart when not in use?
- 5 feet
- 10 feet
- 20 feet (Correct answer)
- 25 feet
Correct answer: 20 feet
OSHA requires oxygen and fuel gas cylinders to be stored at least 20 feet apart, or separated by a non-combustible barrier at least 5 feet high with a fire-resistance rating of at least 30 minutes.
Other Skilled Trades Welding 2
What does TIG stand for in TIG welding?