Use silver solder, also know as Braze 450. If you Google Braze 450 you should find something either here on the zone or on the web.
Braze 450 is low temperature brazing, around half the melting point of regular bronze welding and a joint made with this is very close to the same strength as regular bronze welding. Using regular bronze welding is more or less impossible because your parts will probably melt; using soft solder is probably not strong enough.
One thing abotut using Braze 450 is that your joint clearances should be close; and gap larger than about 0.01" is getting a bit big and it is better to have it around 0.005".
A definite advantage with the 450 is that you can adapt it for production; it is available in both wire and thin shim. With the shim it is possible to do oven brazing; you make fixtures using something like stainless steel although good old fashioned cast iron C clamps can work. Coat the parts with flux at the joint area, clamp them in the fixture with a bit of foil between the parts, put them in a small oven and bring them up to temperature. The oven can be as simple as something like a hobby ceramic kiln; all it has to do is get to the required temperature which is below what is used for ceramic firing.
You can do it with a flame but on small stuff it can be tricky. You need a soft flame to avoid overheating and when you are dealing with wire and parts that have very different cross-sections it is more than tricky it is difficult. If you are using a flame do some searches for information on making silver jewellery because this uses the kind of techniques you need. But flame is not the way to go for production.