Welder Material & Equipment Handling Flashcards

When storing compressed gas cylinders in a shop, how must full and empty cylinders be stored?

Answer: Separately and clearly labeled

Full and empty cylinders must be stored separately and clearly labeled to prevent accidental use of a depleted cylinder or confusion during emergencies.

Which electrode classification suffix indicates that the electrode has a low-hydrogen coating?

Answer: EXX18

The EXX18 suffix designates a low-hydrogen iron powder electrode, which requires storage in a rod oven to maintain its moisture-free coating.

What is the primary purpose of a wire feed unit's drive roll tension in GMAW?

Answer: To ensure consistent wire feeding without slipping or birdnesting

Proper drive roll tension ensures the wire feeds smoothly and consistently without slipping or forming a bird's nest at the wire feeder.

Which type of base metal preparation is required before welding galvanized steel?

Answer: Remove the zinc coating from the weld zone

The zinc coating must be removed from the weld zone because it produces toxic zinc oxide fumes and causes porosity in the weld.

A welder notices the MIG gun liner is kinked. What is the correct action?

Answer: Replace the liner to restore smooth wire feeding

A kinked liner must be replaced because it disrupts consistent wire feeding and cannot be reliably straightened to original condition.

What is the correct procedure when a gas cylinder valve is difficult to open?

Answer: Contact the supplier — never force a stuck valve

A stuck cylinder valve should never be forced; the cylinder must be returned to the supplier as a faulty valve can be dangerous.

What does the designation ER70S-6 indicate about a GMAW wire electrode?

Answer: It is a solid wire with 70,000 psi tensile strength and high deoxidizer content

ER70S-6 indicates a solid electrode rod with minimum 70,000 psi tensile strength and high levels of silicon and manganese deoxidizers for welding over mill scale.