Letter 27061

Electrospark coating technology or micro welding [India] 

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I am a surface engineer in one of science and technology labs in India and design electrospark coating units. Now my question is "what is dependency of pulse duration of the spark current on the coating quality of electrospark coating". I have tried 2 msec to 100 microsecpulses and donot find any reasonable change in quality, but read in an old article that pulse duration affects the coating quality. My another question is " What exactly controls the standoff distance (arc gap)in welding between work piece and electrode". Is it voltage alone if it is voltage may i know some figures like somay volts willhave so many mm length arc gap?.Any sugested books pirticularly for this aspect.

K.R.C.Soma Raju
Surface engineer - Hyderabad, Andhrapradesh, India

What is the differ ESD (or ECS) other coating methods ? what is advantage or disadvantage ?

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- GEBZE, KOCAELI, TURKEY

ESC and ESD are both same it can also be called as pulsed electrode surfacing, ESA and spark hardening etc.

K.R.C.Soma Raju
- Hyderabad, India

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