Spray welding

[Hooked_on_HP]

I am trying to get some more info on this process. What repairs you can do and what you can't. I have a tractor transmission case that was poorly cast and has sand holes in it. It weeps oil. Buying the spray weld kit would be cheaper than replacing the case if it will do a perminant fix and I would have a new toy. Can you get the powders from your local welding supply. It would also be nice to hard face.
Bill

 

[LD1]

I dont know too much about it. We only dabbled about the theory in school. But I have never actually used one.

But it is supposed to be the best way to repair cracks in cylinder heads and engine blocks we were told. (I went to auto trade school).

Just grind out the cracks, and spray weld with the torch to fill back in. The powder is just a cast iron dust. I doubt that it would be good for hardfacing becasue cast iron is soft.

 

[Gary Fowler]

Many years ago, I read about a process the used and oxyacetylene torch and hopper system to direct an iron powder into the flame that was then "sprayed onto a base for buildup of shafts. Could this be what you are talking about. I dont recall the technical name they used for it though.

 

[LD1]

Many years ago, I read about a process the used and oxyacetylene torch and hopper system to direct an iron powder into the flame that was then "sprayed onto a base for buildup of shafts. Could this be what you are talking about. I dont recall the technical name they used for it though.

That is the one I was refering to. I am thinking that is what is is talking about:thumbsup:

 

[Gary Fowler]

The one I saw was used for hardfacing and shaft build up. Depending on the powder used I suppose you could spray weld just about any material.

 

[Gary Fowler]

Try this informative link or just google Flame Spray welding . I also found a company called Thermion that does electric arc spraw welding. Looked expensive for the equipment though

American Welding Society - Welding Journal

 

[yomax4]

If you just have sand cast issues there is another product out there called Crack Sealer. It is designed just for your issue or if a Nickel weld leaks. It is a 6" long x 3/4" stick. You heat your case up to about 500 degrees and rub the stick on the problem area. It is made up of such fine particles that it soakes right into the cast. Last I saw it, It was sold by JW Harris but others sell it too. If you have oxy/acet. Just turn on the acet., smoke the area you wish to heat to 500 degrees. After you cover the area with acet.smoke, Turn on the oxygen. Heat back and forth and when the black smoke on the part goes away..That is 500 degrees. ( or buy a temp stick ) Spray Powder is a fun process and not designed for huge projects. There are a dozen powders you can use for build up, cast repair and yes, Hard surfacing. If you want a CD to look at I can get one to you if you PM me an address.