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• Projection welding is multi spot welding process. • In resistance welding, the pressure is released after the weld cools. • Grey cast iron is best welded by oxy-acetylene. • The edge preparation for welding Is not needed up to 4 mm thickness of plate. • The relation for cutting tool life is given by VTn = C where V is cutting speed, T is corresponding life n and C are constant depending on cutting conditions. The numerical value of n for roughing cut as compared to that for light cuts in mild steel does not on type of cut. • A plug gauge is used to measure cylindrical bores. • Aluminum has a higher cutting speed than cast iron & tool steel. • A magnetic chuck is generally used when a large number of components are turned and parted off from a bar. • Gear tooth vernier is used for measuring gear tooth profile. • Undercutting is cutting from the base of a work-piece. • Laser welding is widely used in electronic industry. • Un- like materials or materials of different thickness can be butt welded by control of pressure and current. • In are welding operations the current value is decided by the size of the electrode. • The phenomenon of weld decay takes place in stainless steel. • Arc below takes place in welding stainless steel. • Swab is used in foundry for repairing the mould.