FCAW and MCAW on mild steel

Question 1

Is it necessary to remove oil and paint from the base metal?

Answer 1

Yes. remove the crap to prevent contamination of the weld and reduce any harmful fumes that may be produced.

Question 2

Describe how to execute a weave bead?

Answer 2

A weave bead is completed with a side to side motion while movement in the direction of travel is taking place.

Question 3

Changing the angle of the electrode holder in relation to the joint:

a) changes the voltage
b) has noe effect on the weld
c) causes the weld profile to change.
d) cause the wire to feed unevenly.

Answer 3

c) causes the weld profile to change.

Question 4

The number/ letter combination 3GF:

a) represent the type of filler wire and shielding gas to be used for the project
b) indicates the vertical position with a combination groove and fillet weld
c) requires the joint to be completed in three passes and ground flat
d) indicates that a mix of three shielding gases is required.

Answer 4

b) indicates the vertical position with a combination groove and fillet weld

Question 5

free card!

Answer 5

free card!

Question 6

Does welding position have any influence on FCAW machine settings?

Answer 6

Yes. Machine settings in the vertical position are likely to be lower than the same weld in the flat position.

Question 7

How would you likely do surface welding on a vertical surface using FCAW?

a) travel horizontally starting from the top of the surface
b) travel horizontally starting from the bottom of the surface
c) travel vertically uphill starting from the bottom left-handed corner
d) travel vertically downhill starting from the top right-hand corner

Answer 7

b) travel horizontally starting from the bottom of the surface

Question 8

what is the main advantage of using FCAW over GMAW?

a) deposition rates are higher
b) equipment is less expensive
c) wire is less expensive
d) welding current requirements are lower

Answer 8

a) deposition rates are higher

Question 9

when mulit-pass welding with FCAW, is it necessary to remove the slag between passes?

Answer 9

Yes - the slag could get trapped between the passes

Question 10

Why are back-up bars often employed on FCAW groove welds?

a) open gaps cause potentially damaging current surges in the main transformer coils of the power source.
b) FCAW root beads in open gaps are characterized by lack of fusion
c) loss of gas coverage is a problem with FCAW in an open gap
d) it is difficult to control penetration in an open gap with FCAW

Answer 10

d) it is difficult to control penetration in an open gap with FCAW

Question 11

How much electrode stickout is recommended when using gas shielded FCAW with 1.2mm wire?

a) 3.2mm -12 mm
b) 10mm - 19mm
c) 20mm- 40mm
d) 2.4mm-3.2mm

Answer 11

b) 10mm - 19mm

Question 12

When welding the fill passes with FCAW on a 1GF using 10mm material, what should the gun angle be in relation to the joint?

a) 10 degree towards the welder
b) one-half the angle formed at the centre of the bead to be placed
c) any angle that is comfortable to the welder.
d) 10 degree away from the welder

Answer 12

b) one-half the angle formed at the centre of the bead to be placed

Question 13

Most FCAW welding techniques use an electrode inclination of:

a) 10 - 30 forehand
b) 40 - 80 forehand
c) 10 - 30 backhand
d) 0 or dead square

Answer 13

c) 10 - 30 backhand

Question 14

What must you be careful of when placing weave beads in a large grove weld?

a) slag entrapment
b) overheating the power source
c) overheating the gun nozzle
d) running out of wire

Answer 14

a) slag entrapment

Question 15

Name 3 safety consideration you should make before beginning a weld.

Answer 15

1. eye and skin protection
2. ventilation
3. set up screens and warning signs

Question 16

What type of technique would you likely use on a 3F weld Ising 10mm material when doing the cover pass?

a) uphill stringer beads
b) uphill weave bead
c) downhill stringer beads
d) downhill weave bead

Answer 16

b) uphill weave bead

Question 17

List the 9 items on the start up checklist of any new project?

Answer 17

a) check helmet for correct shade filter plate.
b) check all exposed skin
c) check wire size and type for suitability to parent metal and position of weld
d) check drive roll pressure
e) check condition of contact tub, gun nozzle, and trigger switch.
f) check shielding gas supply and turn on and set flow rate.
g) check operating parameters on welding procedure
h) energize power source / wire feeder
i) run several beads on scarp metal to fine tune voltage and wire speed.

Question 18

Where is the fillet weld in a CSA 2G test assembly locate?

a) against the bevelled edge
b) against the square edge
c) there is no fillet weld in a 2G test assembly
d) the fillet weld is the cover pass.

Answer 18

c) there is no fillet weld in a 2G test assembly