WorksheetsMIG Welding Test
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
1. Why is the term GMAW preferred over MIG for gas metal arc welding?
a)
MIG only uses flux-cored wire
b)
GMAW is the official AWS term and includes all shielding gases
c)
MIG uses alternating current
d)
GMAW is only used for aluminum
2.
2. In machine welding, what maintains the welding arc?
a)
The welder's hand movement
b)
The filler rod
c)
The power source
d)
The shielding gas
3.
3. In manual welding, what feeds the filler metal?
a)
A wire feeder
b)
A drive motor
c)
The welder
d)
A transformer
4.
4. In automatic welding, what provides joint travel?
a)
The welding gun
b)
The workpiece
c)
A mechanical travel system
d)
The shielding gas
5.
5. In semiautomatic welding, joint guidance is provided by the:
a)
Drive rolls
b)
Power supply
c)
Welding machine
d)
Welder
6.
6. Which factor must be considered when selecting a metal transfer mode?
a)
Paint color
b)
Base metal thickness
c)
Shop temperature
d)
Helmet shade
7.
7. In short-circuiting transfer, which type of current allows metal transfer by direct contact?
a)
Alternating current
b)
Pulsed AC
c)
Direct current
d)
High-frequency current
8.
8. How is metal transferred in the axial spray transfer mode?
a)
Large droplets falling by gravity
b)
Continuous fine droplets across the arc
c)
Short circuits between wire and weld pool
d)
Explosive bursts
9.
9. Which condition is required for spray transfer to occur?
a)
Low current and CO2 shielding gas
b)
High current and argon-rich shielding gas
c)
AC current and flux-cored wire
d)
Short electrode extension
10.
10. What best describes globular transfer?
a)
Fine spray of small droplets
b)
Metal transfers only on contact
c)
Large, irregular droplets falling across the arc
d)
No spatter is produced
11.
11. What is an advantage of pulsed-arc metal transfer?
a)
Increased spatter
b)
Better control of heat input
c)
Lower equipment cost
d)
Reduced shielding gas coverage
12.
12. What is the difference between wire melting rate and deposition rate?
a)
They are always the same
b)
Deposition rate includes spatter loss
c)
Wire melting rate includes shielding gas flow
d)
Deposition rate measures voltage
13.
13. What happens if the GMA welding electrode strikes the base metal outside the molten weld pool?
a)
Improved penetration
b)
Arc instability or weld defects
c)
Increased shielding
d)
Better bead appearance
14.
14. What effect does shortening the electrode extension have on weld penetration?
a)
Decreases penetration
b)
No effect
c)
Increases penetration
d)
Stops metal transfer
15.
15. What type of weld is produced using a forehand welding angle?
a)
Deep and narrow
b)
Wide with shallow penetration
c)
Excessively convex
d)
Incomplete fusion
16.
16. What type of weld is produced using a backhand welding angle?
a)
Wide and flat
b)
Shallow penetration
c)
Deep penetration and narrower bead
d)
Excessive spatter
17.
17. Which component is part of a GMA welding system?
a)
Electrode holder
b)
Flux hopper
c)
Wire feeder
d)
Slag remover
18.
18. Why must GMA welders have a 100% duty cycle?
a)
To reduce power consumption
b)
To allow continuous welding
c)
To cool the shielding gas
d)
To prevent wire burn-back
19.
19. What can happen if incorrect rollers are used with aluminum wire?
a)
Improved feeding
b)
Excessive penetration
c)
Wire deformation and feeding problems
d)
Better arc stability
20.
20. What type of liner should be used for aluminum wire?
a)
Steel liner
b)
Copper liner
c)
Nylon or Teflon liner
d)
Flux-coated liner
100 %
