Review Questions - FCAW Flashcards
Flux Core Arc Welding
What is the difference between FCAW and GMAW?
- FCAW requires external shielding gas
- GMAW uses a tubular electrode
- GMAW requires external shielding gas
- FCAW is better for non-ferrous metals
GMAW requires external shielding gas
A “49” in the FCAW electrode classification E491 T3 indicates;
- shielding gas requirements
- tensile strength
- positions of useability
- for vertical-down only
tensile strength
there are three groups of tubular electrodes:
- self shielded, gas shielded, and metal cored
- self shielded, rutile, and basic
- rutile, basic, and cellulosic
- gas shielded, rutile, and basic
self shielded, gas shielded, and metal cored
Why is the shielding gas composition an important variable in FCAW/MCAW?
- FCAW always requires shielding gas
- the flow controls cooling rate
- weld properties are affected
- MCAW produces its own protection
weld properties are affected
Basic FCAW electrodes can have lower operator appeal due to the flux system. Why are they used?
- lower hydrogen weld metal than rutile type
- higher hardness than metal cored type
- better out-of-position capability than rutile type
- greater selection of readily available diameters
lower hydrogen weld metal than rutile type
What is a normal eletrode extension for FCAW-S?
- 5-10 mm (1/4 - 3/8 in)
- 10-19 mm (3/8 - 3/4 in)
- 19-30 mm (3/4 - 1 1/4 in)
- 38-62 mm (1 1/2 - 2 1/2 in)
38-62 mm (1 1/2 - 2 1/2 in)
What type of roller is best suited for Flux core electrodes?
- U grooved
- V grooved
- knurled drive
- X-spine drive
knurled drive
According to CSA W48-01, in what welding position would an E492T-5 electrode be used?
- all position
- overhead only
- flat groove welds and flat & horizontal fillets
- vertical down only
flat groove welds and flat & horizontal fillets
Which statement is the most correct regarding penetration?
- self-shielded electodes do not penetrate as deeply as gas shielded wires
- eliminating bevelled edges and increasing weld amperage will give better penetration
- penetration is controlled by using lower voltages and slower travel speeds
- gas shielded wires do not penetrate as deeply as self-shielded electrodes
self-shielded electodes do not penetrate as deeply as gas shielded wires
Compared to GMAW and SMAW, self-shielded tubular electrodes produce what?
- greatest amount of fume particulates
- weld deposites free of slag
- the lease amount of fumes
- less visible light to the operator
greatest amount of fume particulates