Spray welding cast iron questions

Is it one of the primitive breeds that looks like a bastard of an OA-torch and a spray gun?

Nick

Nick, Yes, it is looks alot like an acet. torch, with a plastic reservoir for the powder. I forgot my camera today, as I was going to take a pic.

Have they changed in design?

Thanks!

Eutalloy sounds like a Eutectic-Castolin product. Perhaps like this?

It's been a long time since I've dealt with them, but Eutectic used to sell direct thru their own reps. I'd try to get an instruction book from the rep.

Ned Simmons

You have it correct. Used to do flame spraying at the old shop with ceramic coatings. It is a VERY adaptable process, you use the same gun to do ceramic, aluminum, steel, iron, nickel and just about any other material that will not simply ignite in the flame.

You need to preheat the parts to a temperature based on the alloy in question. Then once the part is heated you ignite the torch and set the flame to a nice neutral flame UNLESS your attempting to add carbon or doing a hard surfacing coat. Then you spray a nice even THIN layer onto the part, one coat and preheat again, then the next layer, until your at the thickness you need to start with. It doesn't hurt to blast the part so it is rough and the pores are open as well prior to the heating step.

So it is the simple type. Eutectic makes them, UTP (I think only here in Germany did sell them).

There are others. Electric ones with plasma and shielding gas. Ned described the usage, so not so much to add. Get the specific description for your powder and see wether it serves. There are hard wearing ones, ones for filling up, ones for corrosive protection, thermal isolation ...

Nick

Mine was made by ThermaDyne - looks identical to this one:

At the bottom of the page there are some basic instructions. The "63TG" powder is the general "build-up" powder for cast iron... but I've never had any luck with used exhaust manifolds. Even with pre- and post- heating they crack, and crack, and crack. >;-( David

It's no wonder! That stuff is for coating, and not for welding. :-)

Nick

The stuff that came with my kit is Victor #22 "Build-up" powder. According to the litereature:

. FPBP-22 (22 Rockwell) Shaft build-up; cast iron repair, cracked exhaust manifolds. Easily machined.

Even with pre-heat and post-heat... the used exhaust manifolds all crack.

Salesperson blablabla. I can't imagine how a flame-spraying power should repair cracks. That claim is really idiotic!

Nick

I agree, I would be very skeptical of flame spraying cast iron. Has anyone here actually tried this?

T>

Ive got a complete set, along with a dozen or so bottles of verious powders. I can probably scan the manual for you if you would like.

Gunner

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