Match List – I with List – II and select the correct answer using the code given below the lists.
List – I
(a) Laser beam welding
(b) Electron beam welding
(c) Ultrasonic welding
(d) Friction welding
List – II
(1) Can be applied for welding of refractory metals like niobium, tantalum, molybdenum and tungsten
(2) A sound and clean welded joint is created due to rubbing of two parts against each other with adequate speed and pressure producing intense heat raising temperature above melting point
(3) Clean heat source created much away from job, a narrow spot is heated, work chamber operates in a high vacuum
(4) Clean heat source, very quick heating, very small focal spot, no vacuum chamber is required
Codes:
A B C D
(a) 4 3 1 2
(b) 2 3 1 4
(c) 4 1 3 2
(d) 2 1 3 4