
How do I solder these brass butterfly knife scales?
Hello
I'm making brass scales for my butterfly knife and I'd like to solder some brass pieces onto the base, but I've never done it and my only practice attempt ended up with hard solder rolling up into a ball and the brass piece ended up melting :P I can guess what I did wrong - wrong flux (used a paste made of borax instead of a specific flux, or I made it wrong) or I forgot to completely clean the brass pieces I tried to join. I'll attempt a test piece again but before that I want to ask how should I solder this piece:
As you can see the plates I want to solder are fastened in place with screws. Thing is, where the screws are I want to put brass pins (made from the brass rod above) but I don't know if I should do this before or after soldering. If I rivet the pieces before, the solder should flow into the spaces between the river and plate reinforcing the joint even further.
But then... Just how do I do this? Do I need to put the flux paste between the plate and base? I don't know if it'd work well since after doing that I have to pin them. I really need a step by step process because I'm a little slow and I need to visualize every step.
For materials, I have:
- silver hard solder (2% silver)
- flux paste (Brazing paste AMASAN HS)
- handheld torch (one where you screw on a butane bottle, before you say it's too weak please consider that it IS capable of melting brass :P )
Here's how I see it:
Sand down the parts that will be joined together to increase surface where the solder will flow (ps what grade sandpaper will be best? 240? Higher/lower grit?)
Clean the surfaces with acetone to remove any grease
Smear the surfaces with flux paste
X) Now this is applicable only to this case - rivet the two plates together while wearing rubber gloves being careful no debris gets between them
Heat up the metal by moving the flame back and forth, and touch the solder to the gap when it's hot enough. If done right the solder should flow into the space.
Wait a few seconds and dunk the piece in cold water to harden the flux
Do I have this right? Please help, I really don't want to mess this up...