Safety and Equipment Setup Flashcards

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

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

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

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

Answer: Gas Metal Arc Welding (GMAW)

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

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

Answer: 1/7 of cylinder capacity per hour

Acetylene should not be withdrawn faster than 1/7 of the cylinder's capacity per hour to prevent acetone contamination.

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

Answer: Supplied-air respirator or HEPA-filtered respirator

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

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

Answer: Prevent flame from traveling back into the hoses and cylinders

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

When setting up a MIG welder, the wire feed speed primarily controls which welding parameter?

Answer: Amperage (current)

In GMAW, wire feed speed directly controls amperage because more wire requires more current to melt it.

Which condition makes a confined space permit-required for welding operations?

Answer: The space contains or has the potential for hazardous atmosphere or engulfment hazards

A permit-required confined space is defined by the presence of potential hazardous atmospheres, engulfment, or other serious safety hazards.