The smoke problem of Spraywelder

[attin]

Hi Everyone,

We use spraywelder for hardfacing of glass plunger. We use Col 42C and others firm powders. But we have problems in our application method. Smoke comes out constantly in the process. The powder when we are giving, smoke is starting. Some powders are not making smoke but some powders are making smoke. Smoke comes out of the top of the plunger into the air.
Does anyone have an opinion on this issue?

[djewell]

Any time you melt powders, there are going to be gas fumes (smoke). That is why it is so important that the operator protect himself with good respiration equipment. If you see smoke coming from your part, then the source is something in the part. Perhaps there is some residual oil somewhere inside.

[attin]

Thanks for reply,

smoke is coming in the process, I guess do not come from the part. When the application starts, smoke is coming with casting the powder in the gun. Powder particle size that will have an effect on this problem?

[kschewe]

Thermal spray is very smokey. Wire arc spraying makes so much smoke. Certain metals burn and produce a lot of smoke. The part should not be hotter then 300F so you can check that. Particle size probably wont help the problem. You need better ventilation. Most of our spray rooms have 2000-10000 cfm air movement for a 10x10' room. They use a air makeup unit and a metco dust collector outside.