Safety Practices & Equipment Handling Flashcards
7 cards from real Certified Welder practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Safety Practices & Equipment Handling flashcards as text
What is the maximum cylinder pressure at which acetylene can be safely used in oxy-acetylene welding?
Answer: 15 psi
Acetylene becomes unstable and can decompose explosively above 15 psi, so working pressure must never exceed this limit during oxy-acetylene operations.
Which type of fire extinguisher is appropriate for a welding shop fire involving ordinary combustibles (Class A) and flammable liquids (Class B)?
Answer: ABC dry chemical extinguisher
An ABC-rated dry chemical extinguisher handles ordinary combustibles (A), flammable liquids (B), and electrical fires (C), making it versatile for welding shop environments.
Why should welders avoid wearing synthetic (polyester, nylon) clothing during welding operations?
Answer: Synthetic fabrics melt onto skin when ignited, causing severe burns
Synthetic fabrics ignite easily and melt, adhering to skin and causing deeper, more severe burns than natural fibers like cotton or wool which tend to char instead.
What does the lens shade number on a welding filter indicate?
Answer: The degree of UV/IR and visible light attenuation provided
Higher shade numbers indicate greater light attenuation; the appropriate shade depends on the welding process and amperage level used.
What is the purpose of a fire watch during and after welding operations?
Answer: To monitor for fires and smoldering materials for at least 30–60 minutes after work stops
OSHA requires a fire watch to remain vigilant for fires during welding and for a minimum of 30 minutes after completion, as hidden smoldering can ignite later.
When welding in a confined space, what is the minimum required oxygen concentration in the atmosphere?
Answer: 19.5%
OSHA defines an oxygen-deficient atmosphere as below 19.5%; confined space welding requires continuous atmospheric monitoring to ensure oxygen stays at or above this level.
Which practice best prevents electric shock during arc welding in wet or damp conditions?
Answer: Using dry insulating mats, dry gloves, and ensuring the work area is as dry as possible
Insulating mats and dry PPE break the electrical circuit path through the welder's body, which is critical since moisture dramatically lowers resistance and increases shock risk.