HVOF Spray 4043 Al onto 304 SS

Date 06-18-2007 18:18

Does anyone have experience with HVOF flame spray of aluminum onto 304 Stainless?

We want to build up a layer of 4043 Al on a 304 stainless tube end, and then EB weld
the 304 tube end to a 6061 tube. We currently friction weld with poor results.

They don't want to take me up on explosion welding yet.

By Fredspoppy (**)

Date 06-19-2007 12:22

I don't know what the final application is for the SS to Al tube connection, but flame spray is not normally used for build up that would have structural strength. With flame spray, the deposit may not even be leak tight, as pores between the "splats" can have a leak path to the base. Probably more info on the end purpose of the joint would help.

By OBEWAN

Date 06-19-2007 12:39

It has to be hermetically sealed and have enough structural strength to withstand thermal expansion stress at 800F. Sounds like it is ot the way to go at this point.