Silver Solder Torch Selection

[Danuzzo]

Thank you for your replies. Good to know that the discoloration is normal. Also, appreciate the tips and the links provided for silver brazing. I guess I got lucky on my first try, as far as strength of the join goes. Attached are some photos (sorry about the poor quality), and criticism (not as to the photos) is welcome. I did try some light sanding on it. Need to do more research on the "acid" stuff.

In any event, I should explain what I used. Bernzomatic 8000 torch with propane, although it will use mapp pro as well; Harris 56 silver solder, and the Harris white flux. I did use "fire brick" as a base and surround. The 2 pieces I brazed together were of some turning scraps I had laying around:

1. Base made of mild steel, almost 1" diameter at top flange, about .200" thick with base of about .650" diameter and total height of about .650". Base had a slight shallow hole, more like a countersink on top where I placed part #2. I fluxed the hole.

2. This was a small piece of mild steel abut .320" diameter x about .250" long with a little nipple on top from parting on the lathe that I ground a slight taper to fit in the hole (countersink) of part #1.

 

[Steamchick]

All journeys start with the first small step...
Enjoy! (I do).
K2

 

[Steamchick]

May I suggest... you make a small crankshaft from whatever bar stock you have, silver solder it, clean it up for examination, bend it and bash it to destruction - or distorted to a point the joints are proven to be strong - then cut through in various ways to prove penetration of the silver solder? It can be quite an enjoyable experience finding that the solder went everywhere it should. - Or a learning experience if you find some faults?
It's what I was taught as an apprentice - and passed that test!
Later I did the same in college, and in production (daily checks) in manufacturing.
I wonder how many hobby "engineers" do that sort of thing?

I recall a job where I was managing a small production shop (about a dozen welders), so had to interview new welders, and get them through the testing before they could have a job. It was aluminium MIG welding. I inspected the welds after they were made, and again after they were destroyed and sectioned. I passed and failed people for their competence (to documented standards). But the foreman would not let me weld ANYTHING because I employed certified guys to do that! (I was not certified for welding!).
K2