Review Questions - FCAW

Question 1

What is the difference between FCAW and GMAW?

1. FCAW requires external shielding gas
2. GMAW uses a tubular electrode
3. GMAW requires external shielding gas
4. FCAW is better for non-ferrous metals

Answer 1

GMAW requires external shielding gas

Question 2

A “49” in the FCAW electrode classification E491 T3 indicates;

1. shielding gas requirements
2. tensile strength
3. positions of useability
4. for vertical-down only

Answer 2

tensile strength

Question 3

there are three groups of tubular electrodes:

1. self shielded, gas shielded, and metal cored
2. self shielded, rutile, and basic
3. rutile, basic, and cellulosic
4. gas shielded, rutile, and basic

Answer 3

self shielded, gas shielded, and metal cored

Question 4

Why is the shielding gas composition an important variable in FCAW/MCAW?

1. FCAW always requires shielding gas
2. the flow controls cooling rate
3. weld properties are affected
4. MCAW produces its own protection

Answer 4

weld properties are affected

Question 5

Basic FCAW electrodes can have lower operator appeal due to the flux system. Why are they used?

1. lower hydrogen weld metal than rutile type
2. higher hardness than metal cored type
3. better out-of-position capability than rutile type
4. greater selection of readily available diameters

Answer 5

lower hydrogen weld metal than rutile type

Question 6

What is a normal eletrode extension for FCAW-S?

1. 5-10 mm (1/4 - 3/8 in)
2. 10-19 mm (3/8 - 3/4 in)
3. 19-30 mm (3/4 - 1 1/4 in)
4. 38-62 mm (1 1/2 - 2 1/2 in)

Answer 6

38-62 mm (1 1/2 - 2 1/2 in)

Question 7

What type of roller is best suited for Flux core electrodes?

1. U grooved
2. V grooved
3. knurled drive
4. X-spine drive

Answer 7

knurled drive

Question 8

According to CSA W48-01, in what welding position would an E492T-5 electrode be used?

1. all position
2. overhead only
3. flat groove welds and flat & horizontal fillets
4. vertical down only

Answer 8

flat groove welds and flat & horizontal fillets

Question 9

Which statement is the most correct regarding penetration?

1. self-shielded electodes do not penetrate as deeply as gas shielded wires
2. eliminating bevelled edges and increasing weld amperage will give better penetration
3. penetration is controlled by using lower voltages and slower travel speeds
4. gas shielded wires do not penetrate as deeply as self-shielded electrodes

Answer 9

self-shielded electodes do not penetrate as deeply as gas shielded wires

Question 10

Compared to GMAW and SMAW, self-shielded tubular electrodes produce what?

1. greatest amount of fume particulates
2. weld deposites free of slag
3. the lease amount of fumes
4. less visible light to the operator

Answer 10

greatest amount of fume particulates