On Tuesday, June 23, 2015 at 2:59:41 PM UTC-7, stryped wrote:

.... There are available (at least
there used to be) soldering tips for a propane torch that fit over
the torch head and use a screw to hold them in place.

Could a person make one somehow by just putting a copper tube over the end of a torch and closing one end into a flat surface???

Unless you want to hold a propane tank, keep it upright, and spew flames near the work, it works
better to use a soldering iron. This kind

https://www.etsy.com/listing/94088624/vintage-soldering-copper-soldering-iron

has the advantage of comfortable handle, works in tight spaces, is cordless...
temperature control is kinda primitive, of course, but I've made small ones
with heavy copper wire for tip and heat reservoir, with coathanger-wire handles.
That, and a butane lighter, and you're ready for soldering!

The key, is the heavy tip which acts as heat reservoir.