Filler Metals & Consumables Flashcards

Which AWS filler metal classification prefix indicates a bare solid wire electrode for GMAW?

Answer: ER

The 'ER' prefix denotes a wire that can be used as either an electrode or a rod, which is standard for GMAW solid wires.

What does the 'G' suffix in an E71T-1C-H8 flux-cored wire classification indicate?

Answer: No specific requirements beyond the base classification

The 'G' suffix means the wire meets no requirements beyond those already specified in the base classification.

A welding procedure requires a filler metal with a minimum tensile strength of 80,000 psi for carbon steel SMAW. Which electrode class is the minimum requirement?

Answer: E8018

The 'E80XX' series designates a minimum tensile strength of 80,000 psi; E8018 meets this requirement.

What is the primary purpose of lithium fluoride in a SAW flux?

Answer: Improve slag detachability and reduce fluorine fumes

Lithium fluoride in SAW fluxes improves slag removal and helps reduce the overall fluorine fume generation compared to calcium fluoride alone.

When welding austenitic stainless steel, which filler metal composition is used to prevent weld solidification cracking by promoting a small amount of ferrite?

Answer: Dual-phase with 3–8 FN ferrite number

A ferrite number of 3–8 FN in the weld deposit provides enough ferrite to dissolve sulfur and phosphorus, preventing hot cracking.

Which shielding gas mixture is most commonly specified with ER70S-6 wire to achieve a spray transfer mode in GMAW?

Answer: 90% Ar / 10% CO2

A high-argon mix of 90% Ar / 10% CO2 (or similar) provides the stable arc needed for spray transfer with ER70S-6.

According to AWS A5.1, what does the digit '8' in the E7018 classification specifically indicate?

Answer: Low-hydrogen potassium coating, AC or DC+

The suffix '8' in AWS A5.1 designates a low-hydrogen potassium (LHK) coating usable with AC or DC+ polarity.