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Which of the following statement(s) is/are true regarding butt welding? 1. Flash butt welding is a combination of resistance, arc and pressure welding 2. Upset butt welding is used for welding rods 3. Percussion Welding is a self timing spot welding method 4. Aluminium alloys are flash welded
In electric arc wire spray process, preheating of metal before welding is mainly done to prevent surface cracking.
Which two of the following joining processes are autogenous? i. Diffusion welding ii. Electroslag welding iii. Tungsten inert gas welding iv. Friction welding
Preheating prior to welding is done for the purpose of
Preheating is essential in welding
Preheating of work piece is essential in welding
Which of the following materials necessitates preheating in welding?
Preheating of steel plate during welding is required to
In backhand welding, the angle between the welding rod and the work is ________ as compared to forehand welding.
In forehand welding, the angle between the welding torch and the work is ________ as compared to backhand welding.