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Hello again,I had a job come to me today that involves welding on 1" brass tubing. The client has a vintage era boat (50's or 60's) he is restoring that has a canopy stretched over chrome plated brass tubing. The canopy got caught in the wind while on the freeway and it bent and broke the canopy frame.I will need to cut out a bent, broken area, weld a sleeve over it to join it to the rest of the frame and weld back a cross piece that is coped to fit the area I am repairing, as seen in the picture.I have only soldered and silver soldered brass in the past. Early attempts to tig weld brass was not successful as all I got (if I remember right) was a lot of smoking and not a clean puddle I could dip into. That was like 10 years ago. I never attempted it again.Any suggestions as to how to go about the joining of this material? I did a little research and found that silicone bronze works well as a filler in a tig "brazing" approach. Since this would join steel to brass (or copper and to itself), it seems that I could cut a steel sleeve to tig braze the broken joint and then tig braze the cross piece back on. I used the silicone bronze approach to a cast iron repair a member of this forum suggested to me and it worked great. I wasn't aware it could also be employed to copper based alloys and dissimilar metals..I think another approach would be to get a high tensile strength silver solder and torch it all back together. I took a grinder to the part where the cross piece is joined to remove the chrome plating and found a different colored filler metal at the coped end where it is joined to the broken area. It doesn't look like an arc welded joint and bead, but rather some form of brazing or soldering.Any thoughts on this?Thanks in advance for the help,TonyLast edited by therrera; 07-07-2014 at 01:54 PM.Reason: to correct a grammar mistake
Reply:Make a new one out of stainless steel. The cost of fixing that and then having rechromed I think it everyone would be ahead to just recreate it in stainless
Reply:therrera If this is a 'Concours' restoration - I would take it to the best bicycle frame builder [lugs] in your neighborhood.Internally sleeve the joint with plug openings, then braze the plugs and joint. Go with the bike-builder's recommendation,the 'plugs' maybe redundant.You will also have to keep the other two stubs from disjoiningunder-heat during the repair.Dress to plating specifications, then re-plate.If this was a '28 Duesenberg - it would be worth the effort. If not - it is junk.If not Concours - I'd go with firebrick43's recommendation.Opus.Last edited by OPUS FERRO; 07-08-2014 at 02:54 AM.Reason: Reality of process.
Reply:Hi fellas and thanks for your input. While I was checking out the best way to repair this canopy frame the client took it to a guy who had a wheel to roll part of the canopy that had bent during the wind incident that broke it to begin with. The guy recommended a welding shop near him and he called to tell me that he was taking it there. So be it. At least he called, more than some would bother to do.The client and I agreed to cut the tube just below the torn area, sleeve it from the outside and weld (or braze) it. Then I would move the cross piece over after cutting it loose from the broken part. He was not interested in showroom restoration, only functionality. The idea was to clamp the frame down on my table and fit it together making sure that all the mounting holes were in their correct position so that it would fit back in its proper place on the boat deck.I lost the job but picked up the info on how to handle future such repairs when they come my way. I will either tig braze or torch braze them using silicone bronze rod.Live and learn,Thanks,TonyLast edited by therrera; 07-09-2014 at 12:59 AM.Reason: to ad more information |
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发表于 2021-8-31 23:06:28