Joining broken zinc casting

[griffengm]

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

 

[Hydroformer]

Cyano-acrylate ?

regards,

Hydroformer

 

[griffengm]

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

 

[unclesyd]

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

 

[Hydroformer]

A two-part epoxy may provide enough filler.


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

Hydroformer

 

[TVP]

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

 

[Hydroformer]

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

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

Hydroformer

 

[tomwalz]

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.

http://www.carbideprocessor.com