GMAW (MIG/MAG ) Welding question & answer

 1. Which power source is suitable for GMAW ?

    a) A.C 
    b) D.C
    c) D.C constant voltage

    d) D.C low voltage

    Ans. (c)

2. Which one of the following is most commonly used power supply for GMAW?

    a) A.C

    b) DCEP

    c) DCEN

    d) Any one of the above

    

    Ans. (b)

3.  There are four modes of metal transfer in GMAW. Which one is considered least desirable?

    a) Globular

    b) Short-circuiting

    c) Spray

    d) Pulsed-spray

    Ans. (a)

4. Which one of the following modes of transfer are liable to give high spatter?

    a)Globular and short-circuiting

    b) Short-circuiting and spray

    c) Spray and pulsed-spray

    d) Globular and pulsed-spray

    Ans. (a)

5.  The electrode extended from the end of the contact tip of the welding gun to the arc is called 

    a) Stick-up

    b) Stick-down

    c) Stick-in

    d) Stick-out

    Ans. (d)

6. What will happen to joint if the large weld puddle is deposited in MIG-MAG welding?

    a) Undercut

    b) Lack of fusion

    c) Lack of penetration 

    d) Crack

    Ans.

7. Which of the following welding uses consumable electrode?

    a) MIG

    b) TIG

    c) Laser welding

    d) Thermit welding

    Ans. (a)

8. What is the filler wire diameter used for the 8 mm Plate thick  by MIG-MAG welding?

    a) 0.8 mm

    b) 1.2 mm

    c) 1.6 mm

    d) 2.2 mm

    Ans. (c)

9. What is the name of welding process if the arc produced by a consumable metal electrode is protected by intert gas?

    a) MAG welding

    b) MIG welding 

    c) TIG welding

    d) Plasma welding

Ans. (b)

10. In GMAW, electrode extension is defined as the distance from the -

    

    a) Nozzle from the molten weld pool

    b) End of the contact tube to the molten weld pool

    c) Tip of the wire to the molten weld pool 

    d) End of the contact tube to the tip of the wire

Ans.. (d)

11. In GMAW, the amperage is controlled by adjusting the -

    a) Voltage 

    b) Wire feed speed

    c) Wattage 

    d) Arc length 

Ans..(b)

12. There are four primary methods of metal transfer in GMAW, which one of the following is not included in these methods?

  a) Globular 

  b) Short-circuiting

  c) Spray

  d) Retarded-spray

Ans- (d)

13. What is the function of contact tube in MIG/MAG welding machine?

    a) To avoid atmospheric contamination 

    b) To carry the welding current 

    c) To hold the filler wire

    d) To push the air

Ans- (b)

14. `In MIG welding, what can result from a poor work lead connection?

    

    a) Erratic wire feed speeds

    b) Excessive penetration 

    c) An unstable arc

    d) Overheating  of  power source main transformer coil

Ans; (d)

15. What type of electrode  wire is used with GMAW?

    

    a) Flux cored

    b) Solid

    c) Tubular 

    d) None of  these

    Ans:- (b) 

16. Which of the following gases can be used as shielding gas for GMAW

    a) CO2

    b) Ar+O2

    c) Ar+CO2

    d) Ar

    e) All of the above

    Ans. (e)

17. Thin sections are welding in GMAW process using 

    

    a) Spray 

    b) Short circuiting transfer

    c) Globular transfer

    d) Pulsed arc transfer

    Ans. ( b)

18. Identify the part ' A' shown in the MIG /MAG welding operation.

                           

    a) Current conduct filler wire

    b) Shielding gas

    c) Filler wire

    d) Wire guide

    Ans. (b)

19. The graphic shows MIG/MAG welding spray transfer operation. Identify the part 'A' in spray transfer operation.

    

    a) Gas nozzle

    b) Contact tube 

    c) Workpiece

    d) Electrode extension

    Ans. ( a)

20. What is the function of wire feeder in MIG/MAG welding?

    a) To transmit  the current effectively

    b) To carry the welding current

    c) To control wire feed rate to parameter rate

    d) Wire feed response to signal

    Ans. (c)

21. What is the function of gun-nozzle in MIG/MAG welding?

    a) Wire feed response to signal

    b) To control wire feed rate to parameter rate

    c) To push the air 

    d) To transmit the current effectively

    Ans. (c)

22. "Arc transfer MIG/MAG welding". In MIG/MAG welding process which factor helps for more droplet deposition?

    

    a) Low voltage

    b) High current

    c) Low current

    d) High rate of gas flow

    Ans. (c)

23.  What is the standard distance to be maintained between contact tip and filler wire?

    

    a) 17-20 mm

    b) 14-16 mm

    c) 6-13 mm

    d) 1-5 mm

    Ans. (c)

24. In CO2 gas cylinder, what is the necessity of pre-heater?

    a) To pre-heat the gas

    b) To produce the gas

    c) To reduce the gas

    d) To stop the gas

Ans. (a)

25. Sheilding gas are used in MIG/MAG welding process. which sheilding gas cylinder is coloured in black with white neck?

    a) Argon

    b) Helium

    c) Carbon dioxide

    d) Neon

    Ans. (C)

26. During GMAW process a....... type wire feed roll is selected to feed hard wire,

    a) Flat type 

    b) U- type

    c) V- type

    d) None of these

    Ans. (c)

27. During GMAW process a....... type wire feed roll is selected  for aluminium and other soft wire,

    a) Flat type 

    b) U- type

    c) V- type

    d) None of these

    Ans. (b)