Originally Posted by
calstar
Where and how do you position the preformed rings?
I clean all of the parts first. Then i make sure the preforms fit snuggly into the tube (this is important). I put flux into the tube past where the plug/preform will be and then put the preform into the end of the tube. Finally, I push the preform into the tube using the plug that will ultimately end up brazd in place and then flux the outside of the joint. This way the preform sits right against the plug and the tube. On some early test joints, the preform wasn't touching the tube or the plug and it doesn't melt completely.
Originally Posted by
calstar
Do you heat with the fork pointing up or down?
Gravity is your friend! I aim to have the filler melt down into the joint. For these, I will do the top single socket side, then rotate to do the chainstay joints. I'll take photos of this as I go.
Originally Posted by
calstar
Was the # 3 tip you used for OA a Victor tip(.059 orifice)?
Yes. I used it on a victor 100 torch handle. I used that for sleeves, crowns, bb's and plug dropouts and stuff where there was significant mass to heat. For fillets and braze-ons I use a J-28 with #0. I will try doing some fillets with the propane but, will need to get smaller tips. Fillet brazing with a #5 on thin walled tubing is beyond my skillset!