Today I was inducted into the dark art of brazing by a kind scientific instrument maker. After practicing on a few bits of scrap brass I decided the rebuild a ruined Primus 70 vapouriser. The vapouriser had been twisted so that the stem was cracked and bent; the thread for matching the nipple had been worn as well, so that the nipple could not be tighten at all; and the hex on the bottom of the vapouriser was cactus - almost round with being molested in removal. I cut the top off the vapouriser about 2mm along the riser tube and slipped a brass tube sleeve over it. I then brazed the crack in the lower section of the riser tube and jammed the rest of the tube up through the sleeve so that it met the top of the vapouriser inside the sleeve - all the while making sure the matching surfaces were clean and covered in flux. I then fitted an oversized hex nut over the ruined nut, and set about brazing it all back together with 45% silver brazing rod. I did not have my camera ready until the end. Well, not a pretty job, but it worked! The silent cap fettle for this stove is shown here; https://classiccampstoves.com/threads/restoring-a-silent-burner-for-a-primus-70.27715/ I am on the lookout for a replacement vapouriser for this stove, but in the meantime it functions ok with this practice fettle. More practice on bits and pieces and I'll get the hang of this brazing thing. I'll clean it up and post in the Reference Gallery. Cheers Tony
I'd keep it as is Tony, a conversation/bragging piece. Mistake, showing that silent cap, can't have that here. I see the work surface is getting branded proper like. Duane
Good for you Tony. I found a set of wood stove or kiln fire bricks work good for making a fire proof surface when using a torch. And the bricks allow me to make the surface difference size, as I need. Ken in NC
Hi Tony, great start in usinga new skill. Have a look at these old posts: http://www.astronomiainumbria.org/a...ca/easyweb.easynet.co.uk/_chrish/t-solder.htm http://homepage.ntlworld.com/bryan.rozier/silver_soldering/Silver_Soldering.html
That's great info kerophile. I have not paid attention to the heat absorption. I only used them for the fire resistance. I usually warm the bricks with the torch while using them, too. I believe the first time I saw that was one of Bds video on brazing his caps.
Howdy, Tony, Excellent success, Mate!! This is a skill that I really need to learn. Best to sit down with an expert, but that's not going to happen. So, I just need to forge ahead (no pun intended!), and give this a try!! Your success is an inspiration to me, my friend! Well done! George, huge thanks for those two links!! Excellent info, and now saved and filed away for future use!! Take care, and God Bless! Every Good Wish, Doc
