[TheForge] Brazing vs welding

[Peter Fels and Phoebe Palmer]

At 10:58 AM 11/16/02, you wrote:

Adam, there is a special brazing flux for cast iron..There's an 
old  blackened red  can that I've had for years that was for that but the 
label was burned off years ago..theres some crusty black flux powder in 
it.  Might ask the Anti-borax Co.. Most Important for that sort of repair, 
is de-greasing.
A stronger repair is using nickle rod and a stick welder...an old method 
was to buy cast ( literally) iron rods for torch use and use a similar cast 
iron flux as for braising.

Re Harbor Fright prices..."can't hardly go wrong at those 
prices".........Oh yes you can!
I figure that the  % of HF tools that are utter crap about equals the $ you 
save on the rest..and you have no guarantee on the remainder.

Chris; In years gone by, I've used 2 kinds of brazing rod made for stick 
welders. One was an aluminum bronze. No idea if it is still available.

John CH;  The advantage of using TIG would lie in the shorter time it takes 
to reach heat,the more confined heat propagation ( and heat shock) and the 
lack of flux because the shielding gas keeps the oxy away. Flux cleanup can 
be a real nuisance.

This sage advice is probably worth about what you paid for it..BG

Pete







>a very informative post.  Pete, what do you suggest for brazing cast 
>iron?  I have a couple of vises  (actually I have a LOT of vices)  that 
>failed where the moveable jaw joins the slide bar.  Would like to try and 
>repair them.
>
>The two drawbacks I have found with brazing forged work are:  cant work 
>the piece after brazing if it means heating the join  and that the colors 
>dont match.  OTH being able to disassemble the joint w/o damaging the 
>components can be very handy
>
>Adam
>
>
>At 08:58 PM 11/15/2002 -0800, you wrote:
>>At 06:20 PM 11/15/02, you wrote:
>>
>>
>>There are a bunch of specialized fluxes available for brazing...or you 
>>can use the  same borax you forge weld with.  For gas welding , flux 
>>coated rods are handy. You can get rods to match a range of colors and 
>>rods that melt at different temperatures so that you can build complex 
>>structures is stages. ....
>
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