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SET-UP AND SAFE OPERATING PROCEDURES
0056-0114
Brazing can produce a strong joint and often is used to join metals other than steel, such as brass.
Preparing the Metals to be Brazed
A successful brazing operation can depend on the closeness of the joint tolerances. Typically the
clearance is between 0.001” and 0.010”.
CAUTION
Perform all brazing processes in a well-ventilated area. Toxic fumes may be generated
by the brazing process. Refer to the Material Safety Data Sheets (MSDS) for the brazing
rod and flux to help ensure proper safety measures are in place before welding.
Setting Up for Welding Applications
Clean away paint, rust, grease and dirt prior to beginning the brazing operation. After cleaning 1.
the parts, assemble or secure the joints for brazing.
Refer to the Welding Nozzle Data Charts on page 57 to help select the proper welding nozzle 2.
size and regulator pressure settings.
Follow all safety and operating procedures for setting up welding and heating nozzles.3.
Follow all safety and operating procedures for setting up cylinders and regulators.4.
Brazing Sheet Steel
The following brazing procedures described apply to brazing strips of sheet steel. However, the
techniques can be utilized in all brazing applications.
Heat the tip of the brazing rod and dip it into the flux. Some of the flux will adhere to the 1.
heated rod.
NOTE
Some rods may already have a flux coating.
2. Preheat the base metal to a dull red color. If the base metal is heated to a higher temperature
than this, it may develop surface oxides.
3. Touch the fluxed rod to the heated metal. Allow some flux to melt and react with the base
metal. The melted flux reacts and chemically cleans the base metal.
4. Melt off small amounts of fluxed rod as you braze. If the rod flows freely and “tins” (adheres
to the heated base metal), you have reached the correct temperature.
5. Maintain this temperature by continually moving the flame over the metal. Continue to dip
the rod into the flux. Add sufficient rod to the molten puddle to build the bead.
6. Continue to tin and build a bead until the desired section is covered.
Upon Completion of All Welding and Brazing Operations
1. Shut off the torch oxygen valve. Then, shut off the torch fuel valve. Be careful not to shut off
the fuel valve first; this may create a “pop” type sound. When the “pop” happens it throws
carbon soot back into the torch and may in time partially clog gas passages and the flashback
arrestors.
2. Close both cylinder valves.
Welding Procedures
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