ISRO Technician-B Welder Question Paper - 2017 (Set -1) with Answer Key

Prevent the formation of hard and brittle spots in the weld

Relieve residual stresses in the weld

Both (a) and (b)

Prevent cracking of the weldment

Welding of stainless steel stabilised using elements such as titanium, zirconium etc to eliminate corrosion

Welding of stainless steel using a stable arc

Welding of stainless steel component rigidly fixed to prevent wraping / distortion

None of these

A heat treatment process carried out in a hydrogenated stmosphere to increase the strength and toughness of weldments

A hard facing operation to provide wear resistance properties to the surface of components

A process by which metals become brittle and fracture prone due to the induction and subsequent diffusion of hydrogen into the metal

A gas welding process using hydrogen and oxygen to generate heat for welding

Thoriated tungsten electrodes

Ceriated tungsten electrodes

Zirconiated tungsten electrodes

Lanthanated tungsten electrodes

26000 degree celsius

3000 degree celsius

10000 degree celsius

13000 degree Celsius