See channel playlists for full-length
HD video features available at the
Mechanix HD Video Network...Click channel buttons for
Join 4WD Mechanix Magazine at
How-to HD Videos: Oxygen-Acetylene Gas
"Part 1" of this HD video session covers gas
brazing in a hands-on and detailed way. If you have sufficient band width,
use 'full screen' and 1080P quality settings
for maximum viewing.
Brazing is often misunderstood and under
estimated! Many confuse brazing with soldering, and there are only some similarities. While brazing does rely
on capillary reaction and surface bonding, this is where common threads between soldering and brazing
See the two HD videos on this
"Part 2" of the 'Welding Class: Gas
Brazing' HD video session continues the process with brazing a "T" joint with two sheet metal plates. See
the techique and learn details about the gas brazing process!
(These HD videos can be set and viewed in
1080P quality at full-screen mode—if you have the bandwith!)
When brazing is performed properly,
with closely fitted metal pieces, the results can be exceptionally strong. The high tensile strength of a
brazed metal joint with 0.0015" parts separation could be 135,000 PSI, while the same strength-based filler
material and a separation of 0.024" could drop tensile to 24,000 PSI! Capillary reaction plus closely fitted
metals dramatically increase the bond and tensile of the brazed joint.
The other force involved with brazing
process is the actual surface bond created by atomic attraction and diffusion. Depending upon the degree of
surface porosity in the metals, this can be a mechanical and, more importantly, a chemical or molecular binding
between the filler and adjacent metal surfaces. Bronze is commonly used for sheet steel and cast iron
Brazing can take place as low as 840 degrees F and
as high as just below the melting point of the metal. Bronze and silver or alloy brazing rod will typically
melt between 1000 degrees F and 1700 degrees F. In any case, the filler melting point is well below ferrous
metals like mild steel, cast iron and low alloy steel.
Brazing can be strong and useful, especially for
smaller parts or metals that cannot afford a lot of heat exposure—like this sheet metal.
Tensile strength is a non-issue
with this brazing rod! Weld Mold Company's "26C" alloy brazing rod is for oxy-acetylene process brazing yet
delivers over 100,000 PSI tensile strength for projects like this 'semi-steel' handle repair! In
the HD videos at the 'How-to: Welding Class', you will see the actual break repair, using Weld Mold
Company's niche TIG filler rod. This cosmeticoverlay in 26C, now
finish ground and sanded, provides the texture and surface strength desired.
See the details of brazing in
these two HD video sessions. Consider the value of the brazing process for niche and special applications. An
older, ever reliable process for bonding metals, brazing can help preserve base metals and reduce risk of parts