brazing

cast iron fix

mele miller — Thu, 15 Nov 2007 18:06:06 -0600

So I got a new torch and I want to try my hand at brazing (I have only MIG welded everything). I have an old ornamental piece from the top of a chimney that I have displayed in my living room. During the removal it broke in several places. I would like to try brazing to put it back together. I thought I could do this just on the back. How do I have to clean it? Do I need to grind any rust or just brush it and clean with something.What kind of brazing rod do I use? Any helpful tips would be very helpful.

Repair of unknown bronze /bronze alloy casting

John Hampton — Thu, 15 Nov 2007 13:42:50 -0600

I'm seeking a cautious approach to repair a casting of unknown properties. The piece in question is a wall sconce that appears to be made of bronze/bronze alloy. TIG or OXY/ACET Welding/Brazing is my first choice, epoxy a last resort.

Help! They want Brass!

eligius1427 — Thu, 20 Sep 2007 12:20:08 -0500

Hello,

I was recently commissioned to design some decorative grillwork for a church. They chose to fabricate the pieces out of mild steel and have them powder coated to keep the costs down. The client has since changed their mind and would now like it created out of solid brass to match some existing brass work in the church(300 series brass). I have never worked with brass, but would like to give this a try. I need to do some basic forming, weld or braze numerous connections, and finally be able to polish the whole piece to a shine. Can any one offer advice on brazing or welding brass, the type of filler metal or brazing rod that will blend in with the rest of the piece, ways to protect the surrounding brass during forming and brazing/welding, and polishing the piece out so I can get a mirror shine. Do I need to worry about distortion due to the heat from brazing/welding? Also any tips on material alloy would be greatly appreciated. They want to try to match an existing piece(all that I know is that it is a 300 series brass)which is a rich gold color. The brass on that piece was powder coated with a clear coat to prevent any oxidation. If there is any else I should know please tell me.

Surfacing Evolution

pamolson — Sat, 03 Jun 2006 00:03:01 -0500

This took me 3 months to complete. I started with small pieces of 18-gauge sheet metal and hammered them into the right shape, then migged them together and ground as I created the body.
The dorsal fins were created using welding rods cut in half and then migged on top of shaped 24-gauge sheet metal. I used large metal ball bearings for the eyes - cut them in half on my chop saw.