Safety Procedures & PPE Flashcards

What shade lens is generally recommended for shielded metal arc welding (SMAW) at 200–250 amperes?

Answer: Shade 12

AWS and ANSI Z49.1 recommend shade 12 for SMAW operations in the 200–250 ampere range.

Which type of fire extinguisher is appropriate for an electrical fire in a welding shop?

Answer: Class C (CO2 or dry chemical)

Class C extinguishers use non-conductive agents like CO2 or dry chemical, making them safe for electrical fires.

When welding in a confined space, what is the minimum oxygen concentration required to ensure a safe breathing atmosphere?

Answer: 19.5%

OSHA requires a minimum of 19.5% oxygen for a safe atmosphere; below this level is considered oxygen-deficient.

What does the term 'hot work permit' require before welding begins in a facility?

Answer: A written authorization documenting hazard review and fire watch assignment

A hot work permit is a formal written document that records hazard assessments, precautions, and designates a fire watch.

Which personal protective equipment is specifically required to protect a welder's hands from spatter and heat?

Answer: Leather welding gloves

Leather welding gloves provide the necessary heat resistance, flame resistance, and protection from spatter.

What is 'arc flash' in the context of welding safety?

Answer: An intense burst of ultraviolet and infrared radiation emitted by the welding arc

Arc flash refers to the intense UV and IR radiation released by the arc, which can cause eye and skin burns.

When should a welder perform a pre-use inspection of their welding helmet?

Answer: Before each use to check for cracks, proper shade, and lens integrity

AWS safety standards recommend inspecting the helmet before each use to ensure no cracks, proper shade rating, and intact lens.