Certified Welder Safety and Equipment Setup 3

Question 1

What is the correct action if you smell acetylene in a welding area?

Accepted Answer

Evacuate, ventilate, and locate the leak before re-entering

Answer

Acetylene is highly flammable, so the area must be evacuated and ventilated, and the leak source found before resuming work.

Question 2

Which welding process typically requires a shielding gas to protect the weld pool from atmospheric contamination?

Accepted Answer

Gas Metal Arc Welding (GMAW)

Answer

GMAW (MIG welding) uses an external shielding gas such as argon, CO2, or a mix to protect the molten weld pool.

Question 3

What is the safe maximum acetylene withdrawal rate from a cylinder to prevent drawing acetone into the system?

Accepted Answer

1/7 of cylinder capacity per hour

Answer

Acetylene should not be withdrawn faster than 1/7 of the cylinder's capacity per hour to prevent acetone contamination.

Question 4

Which personal protective equipment is specifically required to protect a welder's lungs from hexavalent chromium when welding stainless steel?

Accepted Answer

Supplied-air respirator or HEPA-filtered respirator

Answer

Welding stainless steel produces hexavalent chromium (Cr(VI)), a known carcinogen requiring HEPA filtration or supplied air.

Question 5

What is the function of a flashback arrestor on an oxy-fuel torch system?

Accepted Answer

Prevent flame from traveling back into the hoses and cylinders

Answer

Flashback arrestors contain check valves and thermal cutoffs that stop a reverse flame from reaching the hoses and cylinders.

Certified Welder Practice Test