2.  Joining of thick plates 2. In abrasive –assisted jet ECM , abrasive are used to facilitate material removal by jet ECM. T K J J n v = ×h( )× , (2) In ECM with passivating electrolytes, chemical reactions occurring at each electrode depend on current density. Functions of an ECM apparatus electrolyte exit electrolyte inflow alignment and workpiece contact isolation mask tool sealing fixing and The two electrodes workpiece and tool is immersed in an electrolyte (such as NaCl). Passivating electrolyte and pulse power supply are usually adopted in micro electrochemical machining (ECM). In ECM, the material removal is due to [GATE-2001] (a) corrosion (b) erosion (c) fusion (d) ion displacement 11. Under low concentration of passivating electrolyte, low 1.  Non-consumable electrode Electrolyte flow is controlled by a digital flow meter with two digit accuracy (make: Endress+Hauser) and pressure gauge is equipped to monitor the flow pressure. The arc current was varied from 400A to 500A. For the ECM process this means, if the working voltage is below the corresponding potential, no reactions can take place and, as a consequence, no current flows [9]. 10. Enter the email address you signed up with and we'll email you a reset link. Resistance to formation of passivating film on workpiece surface 6. For Fe–Cr–Ni based alloys, metal oxides generate and cause significant passivation effects. Electrolyte flow not only enables to remove dissolved metal ions but assists to remove excessive heat by convection preventing electrolyte from boiling. One such example is electrochemical slurry jet machining. Passivation involves creation of an outer layer of shield material that is applied as a microcoating, created by chemical reaction with the base material, or allowed to build from spontaneous oxidation in the air.   During  the  electrochemical  machining  (ECM)  of  iron  (atomic  weight=56,valency=2)  at  current  of  1000  A  with  90%  current  efficiency,  the  material removal  rate was observed  to be 0.26 gm/s.    If Titanium  (atomic weight = 48, valency=3)  is machined by  the ECM process at  the current of 2000 A with 90% current efficiency, the expected material removal rate in gm/s will be, Which  one  among  the  following  welding  processes  uses  non-consumable electrode, In a DC arc welding operation, the voltage –arc length characterstics was obtained as Varc=20+5l where the arc length I was varied between 5mm and 7mm. 3.  Consumable electrode wire 1) Characteristics / Application S.  Electroslag Welding The electrolyte is pumped through the gap between the tool and the workpiece, while direct current is passed through the cell at a low voltage, to dissolve metal from the workpiece. Both legs of the fillets are of 10mm size and the weld length is 30mm. The important variables affecting the surface finish are feed rate, gap dimension, electrolyte composition, viscosity, temperature & flow. electrochemical surface machining J = 0,04 -3 A / cm2 e.g. Home / GATE / Mechanical Engineering / Joining. non-passivating electrolyte for stock removal and passivating electrolyte for finish control. S.  Electroslag Welding passivating electrolyte for stock removal and non-passivating electrolyte for finish control. Selection of electrolyte for ECM is as follows: (a) non-passivating electrolyte for stock removal and passivating electrolyte for finish control (b) Passivating electrolyte for stock removal and non-passivating electrolyte for finish control (c) Selection of electrolyte is dependent on current density For ECM of steel NaCl is used as the electrolyte. Both legs of the fillets are of 10mm size and the weld length is 30mm. The Electrolyte system inputs are the following: dirty electrolyte flow from the ECM machines; Nitric acid (HNO3) solution for dosing for the pH control; Sodium nitrate (NaNO3) solution dosing for conductivity control; Rinse water supply to fill the system. Properties electrolyte should be 1. Assuming linear power source characteristic, the open circuit voltage and short circuit current for the welding operation are, A fillet-welded joint is subjected to transverse loading F as shown in the figure. Academia.edu no longer supports Internet Explorer. The electrolyte carries away the heat and reaction products from the zone of machining. These passivation and transient effects are beneficial to improved machining localization, but they also result … 1 –7 In ECM, both the tool electrode and the workpiece are submerged in an electrically conductive electrolyte, usually an aqueous salt solution such as sodium chloride (NaCl) or sodium … if the allowable shear stress of the weild is 94Mpa, considering the minimum throat area of the weld, the maximum allowable transverse load in KN is. However, the anisotropy of the   2) During  the  electrochemical  machining  (ECM)  of  iron  (atomic  weight=56,valency=2)  at  current  of  1000  A  with  90%  current  efficiency,  the  material removal  rate was observed  to be 0.26 gm/s.    If Titanium  (atomic weight = 48, valency=3)  is machined by  the ECM process at  the current of 2000 A with 90% current efficiency, the expected material removal rate in gm/s will be, 3) Which  one  among  the  following  welding  processes  uses  non-consumable electrode, 4) In a DC arc welding operation, the voltage –arc length characterstics was obtained as Varc=20+5l where the arc length I was varied between 5mm and 7mm. As we all know, electrolyte flow field is one of the important factors in ECM irregular vortex paths of the closed integer impeller. here varc denotes the arc voltage in volts. Power supply are usually adopted in micro electrochemical machining ( ECM ) by jet ECM, are. 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