All welding processes require pressure along with heat.
Explanation: Welding processes involving only heat and no pressure are called the fusion welding processes.
The capacity of welded structures to damp vibrations is quite good.
Explanation: Capacity of welded joints to damp vibrations is poor.
Themit consists of a finely divided mixture of iron oxide and copper.
Explanation: Thermite is a mixture of iron oxide and copper.
Rails in the field are generally welded by using
Explanation: Wherever it is uneconomical to carry welding equipments, thermit welding is used.
In gas welding which of the following is generally used?
Explanation: Intense heat is released I a controlled way and at a moderate temperature.
Among gas and electric arc welding, which has the higher rate of heating?
Explanation: Gas welding has a gas temperature of about 3200’C while arc temperature is about 40000’C.
Forge welding involves heating of parts to elastic stage and joint is prepared by impact force.
Explanation: Heating is done up to plastic stage.
Filler material is used in electric resistance welding.
Explanation: No filler material is used. Only the heat released from resistance of metallic parts to current is used for melting the adjoining parts.
Which type of welding is generally used in automobile sector?
Explanation: Electric resistance welding can be easily automated and hence is used in automobile sector.
Hard peening is
Explanation: Hammering is doe to relieve stresses and inducing compressive stresses to improve the fatigue strength of the joint.