On Wed, 10 Apr 2019 22:34:31 -0600
"Larry Fisk" wrote:
"Ed Huntress" wrote in message
.. .
Miller has a useful, short article on TIG brazing with silicon bronze
up on their website:
http://tinyurl.com/y6xhcxa4
It's worth knowing about.
--
Ed Huntress
I just tig brazed a cracked swivel base on an old athol vise that was
cracked badly
used alum bronze. Rod flows really well on cast iron
preheated and used a pretty long arc and a sharp tungsten
100 amps max with a pedal
AC with the ac balance maxed out.
Used alum cause Jody at welding tips said it shrinks less.
Did seem to pull quite a bit but short beads and cooled in a bucket of sand
overnite.
Jody has some really good TIG brazing videos. Another guy I watch is on
instagram, icweld. Usually it is heavy duty 7018 stick stuff but he has
some interesting cast brazing too. Here is a manifold repair:
https://www.instagram.com/p/BhM6vPml2v2/
https://www.instagram.com/p/BhM6Ziel_rX/
and this one started out as a stick repair but he ended up torch
brazing it after cracking trouble:
https://www.instagram.com/p/BLRLOhuBIPp/
https://www.instagram.com/p/BLRQiTcBMnm/
https://www.instagram.com/p/BLRgLw3h-Za/
https://www.instagram.com/p/BLRpveUhAP7/
https://www.instagram.com/p/BLR1KS4hgkV/
https://www.instagram.com/p/BLSea7nh7YT/
https://www.instagram.com/p/BLSlqYgBhLL/
https://www.instagram.com/p/BLTe571BES7/
I like how he used a portable heater to warm up the casting beforehand.
Didn't work out this time but something that maybe helpful to try
someday ...
--
Leon Fisk
Grand Rapids MI