Welding Technology Mid - II, November - 2014

1.Lack of pentration in arc welding is found due to
  • High current
  • Low current
  • short arc
  • Too low welding speed
Answer: B
2.Spelter is a brazing alloy consisting normally of
  • 50% Cu 50% Tn
  • 50% Cu 50% pb
  • 50% pb 505 Tn
  • 50%Cu 50%Sn
Answer: D
3.Small particles which are thrown out by the arc during welding along with weld metal is called
  • Porosity
  • Spatter
  • Overlap
  • undercut
Answer: B
4.Braze welding is the process in which the metal of diller rod or wire has a ________ melting point than that of the parent metal
  • Lower
  • Higher
  • same
  • None of these
Answer: A
5.Welding decay can be avoided by
  • Post heating
  • pre heating
  • post cooling
  • pre cooling
Answer: A
6.Under cut develops due to
  • Poor penetration
  • Low current
  • High current
  • High voltage
Answer: C
7.Solder materials is alloy of
  • Copper and zink
  • Copper and tin
  • Lead and tin
  • Copper and lead
Answer: C
8.The supplier changed the steel composition from 0.15% carbon, 0.6% manaese to 0.2% carbon, 1.2% manganese. Might this influence the _________
  • porosity
  • cracking in the weld area
  • undercut for fillet welds
  • Lack of root fusion defects
Answer: B
9.Pre-heating a carbon steel manual metal arc welding is carried out to minimize the risk of
  • Scattered porosity
  • worm hole porosity
  • parent metal cracking
  • lack of penetration
Answer: C
10.The presence of iron sulphides in a weld bead may cause
  • Solidification cracking
  • Hydragen cracking
  • Lamellar tearing
  • weld decay
Answer: A
11.The flame used to weld cast iron is ____________
Answer: Carburising flame
12.The weldability of carbon steel for a given thickness and joint design, depends mainly on _______ content.
Answer: Carbon
13.To weld a cast iron job the electrode will be _________
Answer: Cast iron
14.During TIG welding of Austenitic stainless steel pipe, Argon gas baking is called to prevent ____
Answer: Oxidation
15.The property of a material which has the greatest influence on welding distrotion is its _______
Answer: Coefficient of thermal expansion
16.The maximum hardness in the HAZ of steel will increase if the carbon Equivalent value is ______
Answer: Increased
17.The welding machine used to weld non ferrous materials is _______
Answer: Welding rectifiers
18.To weld aluminium the flame used is ___________
Answer: Neutral Flame
19.All alloy steels are successfully welded by _______
Answer: TIG
20.Welding of high strength structural steels are susceptible to cracking in _________ zone in welding
Answer: Heat affected Zone