Brazing question

I have always used silver solder in the fridgy trade 15% rods and you will need a number 2 flux ,make sure you clean the flux off well . using bronze it can be a bit brittle
will work but you have to get it much much hotter to flow
bob

Hi Brazing will be stronger but probably no where as neat as silver solder.
If i was doing something like that i would use silver solder.
And use the correct silver solder, there are many different types ,basically the silver content changes,but just use a general purpose silver solder.

Plus the bracket design to the rail with a good surface area for solder.
75 x6mm bar will certainly strong enough, 3mm would be adequate?

You could use soft solder, if you drilled a 20mm hole through the 75 mm plate to put the tube through, and solder, look at car radiators they are soft soldered and go for years of service.

All depends on your fabrication and soldering skills!
Rob

I found 45% silver solder is great to work with (provided you clean the surfaces properly and use the right flux) and gives a high-strength weld.

Used this rod to solder up high pressure (2000-3000psi) hydraulic fittings on construction equipment for decades, and never had a failure.
In addition to pressure, the soldered hydraulic fittings have to cope with serious vibration, particularly on bulldozers.

Good soldering results always require spotlessly-clean surfaces to be joined, no matter what the type of solder used.
Lastly, close-fitting tolerances of the components to be joined, also assists in final strength.

Cheers, Ron.

Gday Keith, Ron is spot on, 45 % silver solder produces strong neat joints that can be made with lower process temperatures. $15 to $20 will get you a stick of 2.0 mm x1000 (Blue tip) . Regards, Michael

Thanks everyone for your advice. I didn't realise that a tight fit was so important, so I think I'll get the 6x75 surface machined to the pipe radius and get a pro to silver solder these joints.