"Spot welding" brass? Never heard of such a thing nor could I find any instructional videos for use on brass. When you say "spot welding", are you saying that a different process be used in spots along the seam? Or are you saying that the brazing be done in sections so as not to overheat the tube? What I found was that whether I tried to heat the tube uniformly along the seam or tried to heat one section, the seam would want to separate somewhere. In the end, I used binding wire to hold the tube together in several places up and down the tube but it was a pain."Spot welding" to keep from over heating a small section and changing shape of the tube, instructional videos are readily available. Sand or ice also works when bending to keep it from collapsing. Remember to bend with even pressure and not to jerk or strong man it.
I just now noticed that the tubes in the pictures above have zipper seams. It looks like they may have used "fingers" on each side that hook or half-twist together. They look much easier to create than the type that fit together like a jig-saw puzzle.necks can be done in the zipper seam fashion.
Maybe that's what kwgrinnell meant above. I tried that but had a hard time getting the solder to flow in one section without opening up the next. My brazing technique isn't the best.Also, if you tack one end, tack the other end and start to put a spot of brazing dividing each subsequent segments in halves until there's sections of about one inch or less to be closed) the result is way better and you don't need to tie up the cone with wire or anything.
I think that you should give it a try! They might not be making necks all the time and perhaps do the fabrication every so often. I know that someone from the Blazers atelier is a member here but I would definitely get in touch with them and discuss the situation. There is an element of creating yet another competitor in the world of saxophones but since you are at the antipodes they might overlook it. Offering to pay a fee is a very good thing.I wonder if the place in holland would take me in for a week for a fee?
Do you think they might be using a resistive heating technique and solder (perhaps high melting temperature) - rather than "welding" (which to me means melting the base metal)?I take that when spot welding is mentioned nowadays, we're referring to electric spot welding like you'd use for assemblying battery packs together or that. I know Selmer has sarted to spot weld some pieces like the ribs for the palm keys or such. They position the rib in place, tack it, and then once's secured they just fill in the gap with soft solder as usual. Neat for fabrication I'd think, a mess if you ever need to remove the spot welded part.
I don't think there's room for annealing at all. Anyways, we've commented this on other threads... many horn's are annealed after forming anywaysHmmm, interesting. So what happens when you melt brass then rapidly quench? Don't know that I want to think about it.
Glad I'm not a Selmer snob anymore. :twisted: