Gordon Wrote:Hi Guru
to the Surface Engineering Forum.
Other than dye penetrant crack testing, which will only show defects that break the surface I think ultra-sonic, thermography, (possible eddycurrent) and radiography type methods will be needed to detect internal defects.
I will leave your other questions to those more experienced with PTA (plasma transfer arc) welding process.
hi everybody
stellite on pta can be tested by uv
i welded stellite on seats for oil for long time,pta is very sensible machine,everything can cause problems
only the position of powder feeder can be determinante in quality of welding
pre heat is very important,it depend the size you are welding ,we cant recomand any temperature
gas must be controled :arg,hel
dust extraction mustn t make turbulence otherwise you will have some problems :deposition of burnt particule on welding parts
i hope this can help