Silicon Bronze Torch Wedling Structural Tubing

[HackAsaw]

DOM in specific.

It would seem most people constructing high quality structrural tubing items use tig exclusively

can you list why this is so and advise why one would opt for gas torch welding with silicon bronze in construction of high liability structural items. I know it has been done historically for frames and such............ racing bicycles, some old motorcycle frames, and perhaps air frames

also advise of proper procedures for repairing such welds in the event it becomes necessary or adding other mild steel items to such welds

things that won't work would be good to know as well.....
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[Guest]

To answer your first question: "why use tig exclusively " That is because TIG is a fusion process and applying sil bronze is a cohesion process. In my experience with sil bronze, I have applied it with TIG and carbon arc....there may be a Oxy-Acetylene process, but I have'nt used that. Sil bronze in my work is used for claddiing and joining disimilar metals, (copper to stainless) and galvanized sheet metal. It tends to crack and not suitable for structural welding that I have seen. It is good for wear resistance cladding, and non structural stuff. In a braze joint I can see where it might work, but not in a butt or fillet joint.

[Dave Haak]

HackAsaw,

Lose something.........?

I think you left this on the other forum................

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Just having fun with ya!!

Welcome to the forum! and have a good day!

Dave


Sorry, I just could not resist the above.

[Franz]

I guess I'll open my mouth and see if I can shoot myself in the foot here. I've run SilBronz with TIG, Carbon, and an OA torch too. I ran it with Carbon for a lot of years before I knew it could be run with OA, and it worked goor with carbon.
The OA application got started in body shops, and other than a lot of heat warp on thin metal, the process works failry decent, and runs a lot like brass. Actually, it is a brazing process, not welding.
Reheat to move the deposit a little SUCKS with OA compared to what you can do with a carbon.
The joynt also leaves a lot to be desired in situations where it is required to hold either air or water pressure, tends to be porous. There can also be adhesion problems when running with OA rather than Carbon or TIG; a lot like a new guy learning to weld with MIG, and running it like a hot glue gun.
It can be done, but I wouldn't depend on it for strength.
It is a good process for sutting new jaw pieces on cast iron vises, where they won't be subjected to a lot of impact.

[chip hayden]

my experience with bike tubing and aircraft turbine blades [PT-6's] is that it has been done with a silver brazing alloy [BaG#], not silicon bronze welding/brazing. many of these parts are mass-produced, assembled with brazing preforms, then vacuum furnace brazed. you can gta weld silicon bronze and even use it as a heat source to melt silver bazing alloys but, the heat is so great that the elements fume and boil and "go up in smoke". oxy-fuel welding has considerably less heat input and melts the filler metal without overheating it.