Step 7: Silver Soldering the Joints

This is not meant to be a silver soldering tutorial, there are plenty out there and you should get some practice on something that's not a bike frame if it's your first time.  

The silver that we used had a 45% silver content and we used about 1.5 troy oz. of it for the frame.  We also used Stay Silv flux.  I've read to use a flux that can be washed off with water after brazing rather than one that has to be removed mechanically.

One method to practice your soldering is to purchase a few sets of inexpensive lugs.  Go through the process of cleaning them up and fitting them to steel tubing of the right diameter.  Solder the joints and after they cool hold one tube in a vice and use the other tube to apply a bending moment to the joint.  The tube should not break at the joint, but rather along the length of the tubing away from the joint.  Also, you can use a hacksaw to cross section the joint and ensure that you have proper silver penetration.
hello, I'm new in bicycle tube size standards, may i know the thickness of the rubes you used?
Really cool. i allways want to build a luged frame. but in my country are really hard to get. <br>The frame is for a fixie?<br>
Notingkool<br><br>Thanks! The frame we featured in the instructables has track dropouts and so could be used as a fixed gear or just a single speed with a free wheel.
A friend and i going to make bmx frames, but with TIG welding. And for the jig, we are thinking in use a vertical jig, becouse it's easyer to weld both side of the tube in the same weld.<br>Using 4130 steel and 1020. And post-weld heat threatment, but just beacouse we know what we are doing, hahahaha. (i study aeronautical engineer).<br>Hope you make more frames. good luck.

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