Spark Issue on DJ2600 HVOF Flame

[xxxxmgulkokan]

Dear All;

We have Oerlikon multicoat system and we added the HVOF and Flame coatings. Now we are using Plasma HVOF and Flame process in the same cabin.

Therefore we have added new components and changed the gas lines.

Our problem is that  there are too many spark in the HVOF. We don't have any spark in the Plasma and Flame. Please watch the below video. Our gun is DJ2600 and gasses are oxgyen and hydrogen.

Oerlikon changed too many parts but there is no changing. In the flame there is no powder and we can see the diamond label in the flame. 

Is there any suggestion how we can fix the problem ?

https://www.youtube.com/watch?v=ysLMXH5EGj0

[loriolo]

Hi Gulkokan
I have some question to you, is there some technologic problem in the coating? like unfused or oxides or others? if not, the sparks as you call, seems that are not from the inside of the flame, like barrel or powder from the powder feeder, so as HVOF system has higher flame velocity, and maybe there are turbulences inside the cabin and the flame pulls powder from the environment

[plasmajet1990]

Dear All;

We have Oerlikon multicoat system and we added the HVOF and Flame coatings. Now we are using Plasma HVOF and Flame process in the same cabin.

Therefore we have added new components and changed the gas lines.

Our problem is that  there are too many spark in the HVOF. We don't have any spark in the Plasma and Flame. Please watch the below video. Our gun is DJ2600 and gasses are oxgyen and hydrogen.

Oerlikon changed too many parts but there is no changing. In the flame there is no powder and we can see the diamond label in the flame. 

Is there any suggestion how we can fix the problem ?

https://www.youtube.com/watch?v=ysLMXH5EGj0

Hi,


Sparks may be from the powder remaining on the walls of the powder supply tube. 
However, the trajectory of the sparks seems to indicate otherwise.
Check the powder injector (Tungsten Carbide).
During operation the injector is easily consumed (burned) and produces these sparks, especially when it is new and has insufficient cooling.
Over time these sparks will disappear, after the powder injector will be consumed (shortened) 1-2 mm

Ion

[Red Baron]

Dear All;

We have Oerlikon multicoat system and we added the HVOF and Flame coatings. Now we are using Plasma HVOF and Flame process in the same cabin.

Therefore we have added new components and changed the gas lines.

Our problem is that  there are too many spark in the HVOF. We don't have any spark in the Plasma and Flame. Please watch the below video. Our gun is DJ2600 and gasses are oxgyen and hydrogen.

Oerlikon changed too many parts but there is no changing. In the flame there is no powder and we can see the diamond label in the flame. 

Is there any suggestion how we can fix the problem ?

https://www.youtube.com/watch?v=ysLMXH5EGj0

Great video.

The particles don't seem to be powder being sucked in, as they dance randomly out of the flame pattern.  They appear to be in the flame itself.  Any powder in the line picked up in the carrier flow appears as a quick flash, and often puts a little mark on the part being warmed up ( presuming you are in warming stages with no powder flow ).

I would recommend checking all the supply lines for deterioration.  Rust can form inside steel lines and fittings.  I use an old plumbing trick and bleed off a tiny bit of shop air at the end of the vertical steel tube run, just below the outlet that goes into my DJ flowmeter unit.  Another option is to install some debris filters in the shop air, fuel, and oxygen lines as close to the torch as possible.  Also, I have seen some buildup on the HVOF nozzles, and torch tip itself.  

Good quality supplier for any consumable fuels should help.  Any rust inside the tanks can work their way into the torch and cause issues.  

The video reminded me of a chef applying pepper to a flaming dish.... the lightweight pepper particles glow and float in a similar way.    My wife makes me watch too many cooking shows.  

Regards.