Remerciez-le!

Remerciez @Admin pour avoir partagé cet document gratuitement, de la manière la plus simple, en partageant sur les réseaux sociaux.

Guide 87 PRODUCTION TECHNOLOGEYJoggled welding joints are used where severe loading is encountered and the upper surface of both pieces must be in the same plane In an arc welding eye need to be protected against infra-red and ultraviolet rays In electro

PRODUCTION TECHNOLOGEYJoggled welding joints are used where severe loading is encountered and the upper surface of both pieces must be in the same plane In an arc welding eye need to be protected against infra-red and ultraviolet rays In electro slag welding a pool of molten metal is used Plain and butt welds be used on materials upto approximately mm thick The main criterion for selection of electrode diameter in arc welding is the thickness of material DC is preferred for welding of non-ferrous metals by arc welding in arc welding arc is created between the electrode and work by contact resistance Open circuit voltage for arc welding is of the order of to volts The material used for coating the electrode is called slag Plug weld joint is used to join two pieces of metal in the same manner as rivet joint metals TIG welding process uses non consumable electrode When welding is going on arc voltage is of the order of to volts Argon and Helium gases are used in tungsten inert gas welding T- joint weld is used where longitudinal shear is present In MIG welding ?? ux is required Copper is very di ?cult to be spot welded It is not possible to arc weld all types of metals with transformer set because it does not have provision for change of polarity Two sheets of same material but di ?erent thickness can be butt welded by changing the size of one electrode Projection welding is multi-spot welding process Welding processes in which two pieces to be joined are overlapped and placed between two electrodes id known as spot welding In resistance welding voltage used for heating is volts Best reason to decide use of welding in preference to riveting for structural work on extension to a hospital could be it is quieter In residence welding the pressure is released after the weld cools Grey cast iron is best welded by oxy-acetylene Seam welding is continuous spot welding process Up to mm thickness of plates edge preparation is not required Preheating is essential in welding cast iron Grey cast iron is usually welded by gas welding For welding mild steel AC Straight polarity welding is most suitable The brazing metals and alloys commonly used are copper copper alloys silver alloys aluminium alloys extra Forge welding is best suited for wrought iron Two sheets of di ?erent materials but same thickness can be spot welded by changing the size of one electrode Laser welding ?nds widest application in electronic industry percentage carbon steels is most weldable Any type of con ?guration can be welded in friction welding Unlike materials as well as materials of di ?erent thickness can be butt welded by control of pressure and current Cross-wire welding is used in form mesh In arc welding temperature of Degree Celsius may be generated Long arc lengths in welding would require the high voltages and low currents respectively Fluxes are used in welding in order to protect the