Filler Metals & Consumables Flashcards
7 cards from real AWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Filler Metals & Consumables flashcards as text
Which shielding gas mixture is most commonly used for GMAW of carbon steel to balance arc stability, spatter reduction, and penetration?
Answer: 75% Argon / 25% CO₂ (C25)
A 75% Ar / 25% CO₂ mixture (C25) is the industry standard for carbon steel GMAW because it provides excellent arc stability, reduced spatter, and good weld bead profile.
In self-shielded flux-cored arc welding (FCAW-S), where does the shielding of the weld pool come from?
Answer: Decomposition of flux compounds within the wire core
In FCAW-S, the flux ingredients packed inside the hollow tubular wire decompose under welding heat to generate shielding gases and slag that protect the molten pool without any external gas supply.
In the AWS FCAW electrode classification E71T-1C, what does the 'T' designate?
Answer: Tubular (flux-cored) electrode construction
The 'T' in FCAW electrode classifications designates that the electrode is tubular (flux-cored), distinguishing it from solid wire electrodes used in GMAW.
For GTAW (TIG) welding of Type 304 austenitic stainless steel, which filler metal is most commonly specified?
Answer: ER308L
ER308L is the standard filler for Type 304 stainless; the 'L' (low carbon) designation minimizes sensitization and carbide precipitation in the heat-affected zone.
AWS A5.20 covers filler metals used in which welding process?
Answer: Flux-cored arc welding (FCAW) of carbon steel
AWS A5.20 is the specification for Carbon Steel Electrodes for Flux-Cored Arc Welding, classifying both gas-shielded (FCAW-G) and self-shielded (FCAW-S) tubular electrodes.
Which filler metal is most commonly recommended for GMAW or GTAW of 6XXX-series aluminum alloys?
Answer: ER4043
ER4043 (aluminum-silicon filler) is widely preferred for 6XXX-series aluminum because it provides excellent crack resistance, good fluidity, and a bright weld appearance.
What is the primary advantage of the higher silicon (Si) and manganese (Mn) content in ER70S-6 compared to ER70S-3?
Answer: They act as deoxidizers, enabling sound welds on lightly rusted or mill-scaled surfaces
The elevated Si and Mn in ER70S-6 act as powerful deoxidizers, combining with oxygen in the weld pool to produce sound, porosity-free welds even on base metal with light rust or mill scale.