Next stage is the hot bit
The 2 types of commercial torch you can use on the left is a standard highest temprature rated torch that will take butane/propane mix canisters that you can obtain from most DIY outlets.
The righthand one will take MAPP gas canisters this will burn much hotter than the above but sometimes is a bittricky to get the gas when you need it ,but it will take butane canisters from the same range.Note the thread on both torches is different so chose one or the other when buying.
For the job I will use the left hand torch because it is the cheapest choice but it will take a little longer to heat the job up
The next step is the rods, of the 3 on show the white one is a nickel silver rod.
The blue is a heavy brass rod.
The red is a thinner brass rod.
They are already coated in flux so you can braze staight away .The other method is a brass rod dipped into a flux powder then applied to the job.Not all DIY stores stock this
So go with the flux rod
Between them the heating range is from 800-950 degrees I have used the red rod because of its lower melting point, which is what I would recommend.
The next bit is vital you will need to obtain fire bricks ,to heat the work on .This will help to heat the job up faster and keep it hot and will save gas and time
Regards Brennivs