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Joining broken zinc casting

Joining broken zinc casting

Joining broken zinc casting

(OP)
Anyone have any techniques they have used successfully to repair a small zinc casting (<1/4 lb)?  This item has sentimental value to the owner and has become a challenge to me!

Griffy

RE: Joining broken zinc casting

Cyano-acrylate ?

regards,

Hydroformer

RE: Joining broken zinc casting

(OP)
Looked at it but the break line is stretched enough that I cannot get sufficient fit up for super glue.
Also looked at tin/lead solder but had no luck there.  Low melting point and rapid heat transmission rule out silver solder.
Thought about TIG with a backing dam but I am uncertain what might work as a filler.
If all else fails, I may use the parts to make a mold and cast a new one.

Griffy

RE: Joining broken zinc casting

I have had pretty good results with a kit from these people.  It takes a little getting use to but can be done.

http://www.solder-it.com/

There are number of solders that will work but the secret is in the flux.  It was no problem when you could use Cadmium in the solder

RE: Joining broken zinc casting

A two-part epoxy may provide enough filler.

*Without data, you're just another person with an opinion.*

Hydroformer

RE: Joining broken zinc casting

I would investigate adhesive bonding, using something like a two-part epoxy (higher viscosity) to fill the gaps.

RE: Joining broken zinc casting

Good call TVP...
Lol, near parallel post.

*Without data, you're just another person with an opinion.*

Hydroformer

RE: Joining broken zinc casting

Trust me on this one. Silver soldering zinc can be truly disastrous.  First, and only time I tried it, the zinc started disappearing before the silver solder started flowing.    Zinc has a low melting point and it fumes away before it melts.

It also has some nasty health effects.    

Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessor.com

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