In TIG welding, thoriated tungsten electrodes are used, because it ____________________?

Related Mcqs:

1. Projection welding & stud welding is categorised as the _______________ welding?

   A. Pressure
   B. Thermit
   C. Resistance
   D. Arc

2. Consumable electrodes are used in the ____________________ welding?

   A. Gas
   B. Arc
   C. Thermit
   D. Resistance

3. Coating provided on the electrodes used in the arc welding is not expected to_________________?

   A. Add alloying elements
   B. Prevent electrode from contamination
   C. Stabilise the arc
   D. Provide protective atmosphere to weld

4. Thermit welding is categorised as the ______________________ welding ?

   A. Forge
   B. Fusion
   C. Resistance
   D. Arc

5. Current employed in resistance welding ranges from ____________________ kVA/cm2?

   A. 1.2 to 2.5
   B. 4.5 to 6.2
   C. 7.5 to 8.5
   D. 10.5 to 15.5

6. _______________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten ?

   A. Stellite
   B. High speed steel
   C. Cermet
   D. Alnico

7. Steel containing low percentage of nickel, chromium & tungsten are termed as the _____________ steel ?

   A. Wrought
   B. Tool
   C. Alloy
   D. Plain carbon

8. _________________ can replace tungsten in high speed steel ?

   A. Chromium
   B. Vanadium
   C. Cobalt
   D. Molybdenum

9. Chromium molybdenum steel cannot be welded using ______________ welding ?

   A. Thermit
   B. Electrical resistance
   C. Oxy-acetylene
   D. Any of these

10. In electrical resistance welding, distortion results from the use of improper________________?

    A. Clamping methods
    B. Electrodes
    C. Current
    D. Filler material