4130 can't be OA welded?

"clare at snyder.on.ca" wrote in message ...

It is not your standard brazing. It is "fillet brazing", using a much
stronger "spelter" than your standard braze. The process uses a gas
flux (a "Hookah" bubbling the acetelene (I think - might be the O2)
through the liquid flux ). The flux in the flame is EXTREMELY
reactive, so the flame "scrubs" the joint, leaving little if any flux
behind. These brazed joints ARE stronger than the 4130 or 4140 base
metal.

The process was developed for and used extensively by small race car
chassis fabricators in England and the continent. Lotus is a good case
in point.


What is the melting point for the brazing material?

On Wed, 2 Jan 2008 17:01:59 -0500, "Blueskies"
wrote:


"clare at snyder.on.ca" wrote in message ...

It is not your standard brazing. It is "fillet brazing", using a much
stronger "spelter" than your standard braze. The process uses a gas
flux (a "Hookah" bubbling the acetelene (I think - might be the O2)
through the liquid flux ). The flux in the flame is EXTREMELY
reactive, so the flame "scrubs" the joint, leaving little if any flux
behind. These brazed joints ARE stronger than the 4130 or 4140 base
metal.

The process was developed for and used extensively by small race car
chassis fabricators in England and the continent. Lotus is a good case
in point.


What is the melting point for the brazing material?
Designation Description UNS A5.8 AWS Spec Tensile Strength
Lifquidus/Solidus
C-04® Nickel Bronze 680 RBCuZn-B 65,000 psi 162O° F / 1590° F
882° C / 866° C
GF-78 Low fuming Bronze 681 RBCuZn-C 63,000 psi 1630° F / 1590° F
888° C / 866° C
GF-72 Nickel Silver 773 RBCuZn-D 80,000 psi 1715° F / 1690° F
935° C / 921° C





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"Blueskies" wrote in message
...

"clare at snyder.on.ca" wrote in message
...

It is not your standard brazing. It is "fillet brazing", using a much
stronger "spelter" than your standard braze. The process uses a gas
flux (a "Hookah" bubbling the acetelene (I think - might be the O2)
through the liquid flux ). The flux in the flame is EXTREMELY
reactive, so the flame "scrubs" the joint, leaving little if any flux
behind. These brazed joints ARE stronger than the 4130 or 4140 base
metal.

The process was developed for and used extensively by small race car
chassis fabricators in England and the continent. Lotus is a good case
in point.


What is the melting point for the brazing material?


Depends of coarse on specific alloys, but in rough numbers you can figure on
about 1700 for brass filler rod as compared to 2600 for the steel. So you
have a valid point. The next question is what kind of temps will a oil or
fuel fire generate, if being accellerated by 70 to 100 mph intake air?