The Classroom and Hands-On Training
Needed for Excellence!

Brazing Repair  |   Solder Repair  |   Mig Welding

Home Page
Safety procedures
Metal Repair Tools
Sheet Metal Properties
Metal Defect Detection
Paintless Dent Repair
Aluminum Repair
Repairing using heat
Contact Us







Brazing Repair:

Oxygen - Consists of O▓ which does not burn but supports ignition, and has a tank capacity of 2200 p.s.i.  Oxygen gauges are to be set at 39 p.s.i.

Acetylene - Consists of the gas which burns.  This tank has a 600 p.s.i. capacity.  The gauge should be set 6-7 lbs./1mm when in use.

Gauges - Each tank has  a separate gauge.  The acetylene tanks, gauges, and hoses have a left hand thread.  When not in use, safety procedures require that gas pressure must be released and all gauges must be stored in a clean and dry area.

Cutting torch - Used for cutting away metal

Heating torch  - Heating of flux-coated brazing rod and metal surfaces to be repaired or welded.  It is also used for heating solder to desired consistency for application and flux preparation.  This torch can also be adjusted to cut metal.

Brazing Rods- A flux-coated brass rod that must be heated to a pre-molten stage prior  to being applied to the metal.  This can be used to weld adjoining metal surfaces, and to fill both holes and gaps.

Safe Operating Procedure:
With the torch connected to the oxygen and acetylene source, and the corresponding gauges properly set , the torch is now ready to be ignited.  The torch body gas gas flow regulating valves for both the oxygen and acetylene gases.  When not in use, their valves should be closed.  To ignite the torch, turn each valve 1/8 turn to the open position and spark the torch nozzle by using a flint and steel striker.  The torch flame can be adjusted to provide varying degrees of temperature.  Weak oxygen pressure, combined with weak acetylene pressure, will result in a low temperature flame.  Strong oxygen pressure, combined with strong acetylene pressure, will result in high temperature flame.  Both the oxygen and acetylene valves can be adjusted independently to achieve the desired temperatures and lengths of torch flames.

Brazing Repair Procedure:
When bonding two metal surfaces together using the brazing process, the flux-coated brazing rod must be heated to a temperature slightly below its melting point.  The torch flame should have a medium "feather" or legth and should not be so hot as to cause the brazing rod flux to pop as it melts.  Now the brazing rod can be applied to the surfaces to be bonded.  The surfaces to be brazed are then heated with the torch along with the brazing rod until the rod reaches its melting point.  A proper brazing bond is completed when the molten brass "flows" across both surfaces.  This brazing bond will harden as the metal cools.  Disturbance to the bonded area before the brazing has cooled or "cured" will result in bonding / weld failure.  To speed this process, water may be applied.  The brazing process can also be used to fill metal fatigue splits, bridge gaps between adjoining metal surface, and to repair gunshot (spot gun) holes where the metal itself has been burned away.  As before being applied to the metal surface.  Then the metal surface and the brazing rod are heated together.  The starting point can be self determined: however, once begun, the tip of the heating torch should be moved along the brazing rod approximately 1/4" to 1/2" ahead of the rod's melting point (on the rod itself).  This will allow the molten brass to solidify quickly after being applied , resulting in layering of the brazing material.  With practice and patience, the filling of areas requiring repair can be completed.



   Copyrightę 2001, 2002, UCI Advanced Metal Finish Training 
   All Rights Reserved

    Phone: (405) 340-5527




Best viewed at 800 x 600 Resolution