flame spray hardness too low
06-14-2008, 11:12 AM,
#1
flame spray hardness too low
Hi,Gordon
Another question is the flame spray sample of Metco314NS hardness too low,with the same parameter we spray before,now the HR hardness only 20-30,but at before it's 55 around.we changed powder feed rate,Oxygen&Acetylene flow,one item one time.it doesn't work.which parameter do you suggest to adjust foremost?
And any other function of the gun cooling air excpet for cooling the gun?
Thank you!
Joanwang
Reply
06-15-2008, 09:48 AM,
#2
RE: flame spray hardness too low
joanwang Wrote:Hi,Gordon
Another question is the flame spray sample of Metco314NS hardness too low,with the same parameter we spray before,now the HR hardness only 20-30,but at before it's 55 around.we changed powder feed rate,Oxygen&Acetylene flow,one item one time.it doesn't work.which parameter do you suggest to adjust foremost?
And any other function of the gun cooling air excpet for cooling the gun?
Thank you!
Joanwang

Hi,

Maybe you have a problem with your equipment? If you receive no alarm, probably the problem is located between the jambox/control box and the gun. I am not familiar with HVOF, but I have experience with plasma guns. Check for any gas leakage on the hoses. And check the gun, be sure that there is no crack that allow the cooling water to pass to the combustion area.

Good luck!

Pablo
Reply
06-15-2008, 01:05 PM,
#3
RE: flame spray hardness too low
Hi Joanwang

Sign0016 to the Surface Engineering Forum.

joanwang Wrote:Hi,Gordon
Another question is the flame spray sample of Metco314NS hardness too low,with the same parameter we spray before,now the HR hardness only 20-30,but at before it's 55 around.we changed powder feed rate,Oxygen&Acetylene flow,one item one time.it doesn't work.which parameter do you suggest to adjust foremost?
And any other function of the gun cooling air excpet for cooling the gun?
Thank you!
Joanwang
With Metco 314NS, strictly follow the recommended parameters, adjusting only the acetylene flow; reducing flow to lower hardness, increasing flow to increase hardness. If you can not achieve the 50 +/-5 HR15Y then suspect equipment/process problem or problem with powder batch. 20-30 does sound very low. Try increasing Acetylene flow, if this does not increase hardness to correct level, then there is little point in messing with other parameters. The problem will be with the equipment or powder.

Quote:And any other function of the gun cooling air excpet for cooling the gun?
6P 3 air cap can be place in two positions; one to give gun cooling only, the other to give pinch air, which pinches and cools spray stream as well as cooling gun.
Reply
06-15-2008, 01:09 PM,
#4
RE: flame spray hardness too low
Hi Pablo

Sign0016 to the Surface Engineering Forum.

pabloarriola Wrote:
joanwang Wrote:Hi,Gordon
Another question is the flame spray sample of Metco314NS hardness too low,with the same parameter we spray before,now the HR hardness only 20-30,but at before it's 55 around.we changed powder feed rate,Oxygen&Acetylene flow,one item one time.it doesn't work.which parameter do you suggest to adjust foremost?
And any other function of the gun cooling air excpet for cooling the gun?
Thank you!
Joanwang

Hi,

Maybe you have a problem with your equipment? If you receive no alarm, probably the problem is located between the jambox/control box and the gun. I am not familiar with HVOF, but I have experience with plasma guns. Check for any gas leakage on the hoses. And check the gun, be sure that there is no crack that allow the cooling water to pass to the combustion area.

Good luck!

Pablo

Thanks for your input.
Reply




Possibly Related Threads…
Thread Author Replies Views Last Post
  Propeller shaft repair by flame spray in the cones area Iwan Sedaryawan CA 1 1,634 12-09-2016, 04:56 AM
Last Post: Stephen Booth
  Flame spray guns 5P, 5PII, Type N Hector Monjardin 1 2,182 11-17-2016, 10:35 PM
Last Post: mgbaca
  Build up with Powder Flame Spray Met.Eng. 8 8,167 05-30-2016, 12:08 PM
Last Post: Gordon
  Wire Flame spray and Twin Arc spraying wtaz 1 2,751 03-30-2015, 09:41 PM
Last Post: loriolo
  Technology of Flame Spray -old and new Boris Eizner 0 2,118 01-29-2015, 10:04 AM
Last Post: Boris Eizner
  acetylene flow limits for flame spray metco 6c chromalloymachi112 1 2,754 12-04-2014, 12:18 AM
Last Post: Met.Eng.
  Hardness with Arc Spray Wire Edson 4 4,096 11-21-2014, 11:56 PM
Last Post: loriolo
  what's the effect of the spray energy to the coating's hardness? Spark 3 4,042 07-10-2013, 05:55 PM
Last Post: loriolo
  "Flame Spray Handbook" sal 0 2,921 04-28-2013, 07:49 PM
Last Post: sal
  pencil hardness and tukon hardness test transit 6 16,206 10-04-2012, 02:15 PM
Last Post: bruisjem
  16 E flame spray sal 4 4,442 09-17-2012, 08:32 AM
Last Post: loriolo
  Powder Flame Spray for Ceramics Met.Eng. 9 8,487 09-19-2011, 04:46 PM
Last Post: Gordon
  Machining for Aluminum Bronze wire flame spray iwan-sedaryawan 3 6,129 01-12-2011, 11:47 AM
Last Post: iwan-sedaryawan
  Flame spray aluminuim WULF 4 4,349 02-06-2010, 10:02 AM
Last Post: WULF
  Which powder should I use with my combustion flame spray gun? jamaicanarchie 3 4,535 06-06-2009, 06:05 PM
Last Post: Gordon



Users browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd