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why powders can not stick on the workpieces?

why powders can not stick on the workpieces?
Update Time:2014-04-18
We usually get the questions of client about this problems. 

1.An output voltage is too low : Adjust the output voltage


2. air pressure is too large: Adjust the air pressure


3 piece rust is not complete: Thoroughly cleaning the surface


4. piece grounded bad: Check the workpiece