Welding Technology Mid - I, September - 2014

1.The main criterion for selection of electrode diameter in arc welding is material to be used
  • type of welding process
  • thickness of material
  • voltage used
Answer: C
2.The material used for coating the electrode is called
  • protective layer
  • binder
  • flux
  • deoxidizer
Answer: C
3.Pick up the incorrect statement about MIG welding.
  • No flux required
  • High welding speed
  • Increased corrosion resistance
  • Even unclean surface can be welded to obtain sound welds.
Answer: A
4.Projection welding is
  • Continuous spot welding process
  • Multi-spot welding process
  • Used to form mesh
  • Used to make cantilevers
Answer: B
5.Welding process in which two pieces to be joined are overlapped and placed between two electrodes is known as
  • Percussion welding
  • Projection welding
  • Seam welding
  • Spot welding
Answer: D
6.aser welding finds widest application in
  • heavy industry
  • structural work
  • process industry
  • electronic industry
Answer: D
7.Which of the following carbon steels is most weldable?
  • 0.15% carbon steel
  • 0.3% carbon steel
  • 0.5% carbon steel
  • 0.75% carbon steel
Answer: A
8.Which of the following welding process uses consumable electrode?
  • TIG
  • MIG
  • Thermit
  • Laser
Answer: D
9.Arc welding uses which of the following electric supply?
  • A. C.
  • D. C.
  • both A.C. and D. C.
  • spiral waveform
Answer: C
10.TIG welding is best suited for welding
  • Mild steel
  • Aluminium
  • Stainless steel
  • Carbon steel
Answer: B
11.Filler material in welding should have -------------------------------.
Answer: same composition and melting temperature as the parent metal to be welded
12.A pool of molten metal is used in……….. welding.
Answer: Electroslag
13.The striking voltage as compared to voltage during welding in arc is ----------------.
Answer: More
14.Seam welding is ---------------------------.
Answer: Continuous spot welding
15.In the manual TIG welding, the angle of electrode holder with the direction of welding is ------------------.
Answer: 450
16.The amperage to be used in arc is dependent upon ----------------.
Answer: Arc gap
17.The vacuum maintained in the electron beam welding machine is ------------.
Answer: 10-5 torr
18.The electrostatic welding is accomplished by----------------------.
Answer: Maintaining a hot molten metal pool between plates
19.In -------------------- welding process, the parts are heated to welding temperature and then mechanical force is applied at the ends to unite the metals.
Answer: Forge
20.A weldment consists of ------------------------.
Answer: Fused part + HAZ + base metal