AMDRY6420

[DanyGans]

Hi Sirs,
Does somebody familiar with APS of AMDRY6420?
Trying to spray rotating 1.5 inch 718INCO ring outside diameter by 9MB.
MCL reject few specimens due to >4% porosity and shrinkage cracks. Hardness was approx. 1200HV0.3 (1100min required).
Process additional information: GH nozzle/4" Sp.Dist/ 4:1 Ar-H2.
Air jets 6" intersection with 37psi.
Thanks in advance for every one who can provide some information about.
Dany

[loriolo]

Try with this parameters, because the cross jet is not necessary, create to much turbulence, and as I can presume, your main problem could be the powder feeder, Metco powder feeders were ever very unstables and you could not change carrier gas pressure without changing powder rate, try with a powder feeder which do not have this problem:
Gun 9MB, Nozzle GH
Gas Ar/H2, pressure 75/50 psi, Flow 80/15
Powder port n° 2
Air get 75 psi / Parallel
spray rate 38 g/minute
Power 550Amp/ 68 Volts
Spray distance 68 mm

[DanyGans]

Hello Luigi,
Many thanks for your process recommendetion and interesting point of view about Metco powder feeders unstability.
I'll check in my process.
Regards,
Dany

[loriolo]

I mean about 4MP, MFP, 6MP, 9MP, 5MP, but if you have a twin powder feeder version, there is not any problem.