Bonding

[Mark P]

What bonding medium is best for:

 

1) Brass to brass

2) Brass to plastic

 

Thanks in advance for any input.

 

Mark Proulx

[BiggTim]

Brass to brass? Solder, hands down.  

 

I know that's not what you asked! In both cases, if you want it to be tough, then fast-cure epoxy, such as J-B quick or standard 5-minute epoxy (like the type made by Bob Smith). Cons: it's messy and hard to control, and it's a bit slower.

 

Truth is, I tend to use thin or thick CA more than anything, with pretty decent results. The trick is to sand the surfaces of the PE slightly with some fine sandpaper first, and spray them with accelerator before applying the CA. It seems to do a pretty good job in most situations, providing the parts will not have to hold a lot of weight, or withstand much force. Just my 2 cents.

 

T

[Mark P]

Thanks!

 

However, the brass gear for the 24th scale Airfix Typhoon so weight might be an issue!

 

Mark Proulx

[BiggTim]

For landing gear, I would definitely suggest epoxy very carefully, and sparingly, applied.

[Paulpk]

For brass to brass, I did a number of tests a while ago and found Permatex Steel Weld 84109 had my best results. My first test with it failed but luckily I did additional tests and was extremely impressed.

 

It is not as fast as soldering, actually a slow process but very strong once cured. 5 minute working time, 10 minute setup, 24 hr full cure according to the instructions.

 

 

Edited December 2, 2023 by Paulpk
Adding images