SMAW and Oxyfuel Cutting on Mild Steel Flashcards
1
Q
What is the recommended bevel angle for single Vee groove butt joints on
9.6 mm (3/8”) material?
a) 20°
b) 30°
c) 45°
d) 60°
A
b) 30°
2
Q
- What is a quick and efficient method to check the width of your root face?
a) micrometer
b) laser alignment tool
c) welding electrode core wire
d) tape measure
A
- c) welding electrode core wire
3
Q
- Why should you ensure that your tack welds are of good quality?
A
- The tacks become part of the finished weld.
4
Q
- Why do you often use the E4310 (E6010) electrodes for the root pass?
a) Because they are inexpensive.
b) Because iron powder content gives high deposition rates.
c) Because of the shallow penetration characteristics and smooth finish.
d) Because of the deep penetration characteristics and fast freeze puddle.
A
- d) Because of the deep penetration characteristics and fast freeze puddle.
5
Q
- How long should the tack welds be for the weld projects in this module?
a)2.5 mm - 3.2 mm (3/32” - 1/8”)
b)4 mm - 5 mm (5/32” - 3/16”)
c)6.4 mm - 9.6 mm (1/4” - 3/8”)
d)12.8 mm - 19 mm (1/2” - 3/4”)
A
- c) 6.4 mm - 9.6 mm (1/4 - 3/8”)
6
Q
- What is the recommended included angle for a single Vee groove weld preparation
for 9.6 mm (3/8”) plate?
a) 15°
b) 22.5°
c) 30°
d) 60°
A
d) 60°
7
Q
- Draw a sketch indicating the land and gap recommended for SMAW of 9.6 mm (3/8”) plate with a single Vee joint preparation using E4310 (E6010) for the root bead.
A
- Figure 31 shows the correct land and gap. Figure 31
8
Q
- Why are tack welds made on the back side of a plate member?
A
-The tack welds on the back side ensure that the ends are fully fused, which reduces notching effects when the coupons are bent.
-Tacks on the back side also allows easier alignment of the plates.
9
Q
- What indicates complete penetration when doing a root bead with E4310 (E6010)?
a) The keyhole is continuous.
b) The weld metal blends well into the groove side walls.
c) Spatter is excessive.
d) A heavy slag covers the entire weld zone.
A
- a) The keyhole is continuous.
10
Q
- How much weld reinforcement should you leave on the cap pass?
a) flush with the surface of the parent metal
b) at least 5 mm (3/16”)
c) approximately 10% of the material thickness (very slight convexity)
d) as high as it is wide
A
- c) approximately 10% of the material thickness (very slight convexity)
11
Q
- What is the theoretical electrode angle when using SMAW?
a) 1/2 of the included joint angle
b) 1/2 of the bevel angle
c) 15° to 20° towards the direction of travel
d) 15° to 20° away from the direction of travel
A
- a) 1/2 of the included joint angle
12
Q
- What is the main purpose of the first fill pass?
a) to fill the joint in preparation for the cap
b) to check the current setting
c) to overcome arc blow
d) to penetrate into the root and melt out any slag or undercut
A
- d) to penetrate into the root and melt out any slag or undercut
13
Q
- What is the recommended electrode inclination for the root pass on a 45° overhead open root groove weld using E4310 (E6010)?
a) 20° backhand
b) 0° to 10° backhand
c) 20° forehand
d) 20° to 30° forehand
A
b) 0° to 10° backhand
14
Q
- What is the recommended electrode inclination for the fill and cap pass on a 45° overhead groove weld using E4918 (E7018)?
a) 30° backhand
b) 20° backhand
c) 0° to 10° backhand or forehand
d) 20° forehand
A
- c) 0° - 10° backhand or forehand
15
Q
- What is a common problem with inclination in the 4G position?
A
-As the electrode melts off, the
electrode inclination changes to
forehand.
-An excessive forehand inclination on
the root pass reduces the arc force needed to push the puddle up above the plate surface.
-The resulting root pass is generally fused, but appears concave.
