V.B.POLYTECCHNIC NAME : Mistry Rihen SEMISTER : 3rd DIV : B

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Presentation transcript:

V.B.POLYTECCHNIC NAME : Mistry Rihen SEMISTER : 3rd DIV : B E.NO : 106550319107 BATCH NO : 105 SUB.NAME : M.E.-1 SEMINAR NAME : Electron Beam Welding

INTRODUCTION : EBW : “Fusion Welding Process in which a beam of high velocity electrons is applied to materials being joined”. Kinetic energy of electrons is transformed in to Heat Energy. Work pieces melt due to heat and joining occurs. Molten metal will flow to fill the gap.

DIAGRAM :

WORKING : Current is given to cathode in vacuum chamber and heated up to 2000 °C. So, electrons are emitted and will be attracted towards anode. Electrons are accelerated due to potential between anode and cathode. Electrons will pass through the hole and form a beam of high intensity.

Electron beam having High Power Density can be controlled by focusing coil. Electron beam will struck on work piece with high velocity and produce heat energy. So, metal will meltdown and molten liquid metal will flow in the gap. Thus , welding is performed and metals can be joined.

STEPS USED IN EBW PROCESS : Joint Preparation Cleaning of work pieces Fixturing of work pieces De-magnetization of work pieces Setting up work pieces in chamber Pump down air from chamber Carry welding process

ADVANTAGES : It is high quality welding. Very less defective because electron beam covers sharp area on metal which is being heated. Welding on reactive metal can be done easily in vacuum chamber. Butt joint process can be done without edge preparation in pieces having width up to 6 mm.

DISADVANTAGES : Primary costs are high. Transportation of equipments are not easy. Vacuum is required every time in chamber. Skilled persons are needed for process. Space in chamber is very small so cant useful for larger piece. Manipulation of work piece needs special care & instruments in chamber. Electron beam flows in straight line so if obstacle comes then welding will stop.

APPLICATION : Welding of reactive and refractory metal. For welding of two different metals like steel, copper, titenium etc. Automobile and aircraft

CONCLUSION : So, we can conclude that Electron Beam Welding is very useful in which correctness and accuracy is required and most of commercial application it is wildly used.

REFERENCE : www.wikipedia.com Manufacturing Engineering by M.K.Vora.

THANKS