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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
Which two of the following joining processes are autogenous? i. Diffusion welding ii. Electroslag welding iii. Tungsten inert gas welding iv. Friction welding
Consider the following statements: 1. Both ferromagnetic and ferrimagnetic materials have domain structures; each domain has randomly oriented magnetic moments when no external field is applied. 2. Both ferromagnetic and ferrimagnetic materials make those domains that have a favourable orientation to the applied field grow in size. 3. The net magnetic moment in ferromagnetic materials is higher than that in ferrimagnetic materials. 4. The net magnetic moment in ferrimagnetic materials is higher than that in ferromagnetic material. Which of the above statements are correct?
Consider the following statements: In metal arc welding 1. Utilizes a consumable electrode 2. A welding torch used is connected to acetylene gas supply 3. The electrode and work-piece are connected to the welding power supply. Which of these statements are correct?
Consider the following statements in respect of the oxidizing flame due to excess oxygen in welding: 1) AT high temperature, it combines with many metals to form hard and brittle oxides. 2) It causes the weld bead and the surrounding area to have a scummy appearance 3) It has good welding effect in welding of copper-base metal. Which of the above statements are correct?
Preheating prior to welding is done for the purpose of
Preheating is essential in welding
Preheating before welding is done to
Preheating of work piece is essential in welding
In electric arc wire spray process, preheating of metal before welding is mainly done to prevent surface cracking.