Brazing on carbide

[waynemak]

Ok I finished my stump grinder an have used an old HSS milling cutter from
my horizontal mill. I am going to make a cutter that uses carbide, can I
braze carbide inserts with brass brazing rod?? I looks to me that's how its
done, I would prefer not to use silver solder as the cost is high.

[Brian Lawson]

Hey Wayne,

Pound for pound you are quite correct. But there is not much "weight"
comparison between brazing and silver soldering (silver brazing). The
silver solder applied to hold carbide cutters is in a VERY thin leaf
cut to size, right in place, and the carbide held in place, so that
there is no waste at all, unlike burning up a brazing rod.

Take care.

Brian Lawson,
Bothwell, Ontario.
XXXXXXXXXXXXXXXXXXX

[David Billington]

I think you will find that a special flux is required to get the best
results. I have a can of sifbronze flux for brazing stainless steel and
carbide inserts and it works far better than the standard sifbronze flux
for brazing steel. Special stainless fluxes are available for silver
solders as well.

[Eric R Snow]

On Sun, 31 Oct 2004 07:26:12 -0500, "waynemak"
<wayneD...@makowicki.com> wrote:

Can you use cheap carbide toothed skillsaw blades? I modified my Ryobi
weedwhacker to use these blades which are available for $7.00 each
locally. They will take a surprising amount of abuse before the theeth
are too dull to cut alders anymore. Maybe these blades stacked would
work.
ERS

[Richard J Kinch]

waynemak writes:

> Ok I finished my stump grinder an have used an old HSS milling cutter
> from my horizontal mill. I am going to make a cutter that uses
> carbide, can I braze carbide inserts with brass brazing rod??

Brazing bits of tungsten carbide onto steel shanks can be done with a
propane/air torch and 45 pct silver brazing rod and fluoride flux:

http://www.grainger.com/Grainger/productdetail.jsp?ItemId=1611760433
http://www.grainger.com/Grainger/productdetail.jsp?ItemId=1611760405

Wets carbide very easily, partly due to the toxic cadmium content. I have
done huge custom tools (3/4-inch shank and 3-inch diameter) with a Reil
propane-air burner.

[Martin H. Eastburn]

waynemak wrote:

Take a good read of this page : the company has good pictures and information.

http://www.carbideprocessors.com/Brazing/book/index.htm

I have the hard copy of the book - but color pictures are nice.

Martin

--
Martin Eastburn, Barbara Eastburn
@ home at Lion's Lair with our computer old...@pacbell.net
NRA LOH, NRA Life
NRA Second Amendment Task Force Charter Founder

[Richard J Kinch]

Martin H. Eastburn writes:

> http://www.carbideprocessors.com/Brazing/book/index.htm

My conclusion is that if you're brazing carbide yourself, you can use the
silver-cadmium alloys, and get the best performance and the lowest melting
point. Just use good ventilation.

I expect the Chinese toolmakers aren't so fussy about using cadmium brazes.