Campingaz Oxypower CV60 Manual De Instrucciones página 55

Brazing is joining two overlapping parts (same or different metals) using solder with a
melting temperature lower than that of the metals being joined. The parts do not melt,
only the solder, which infiltrates by capillary action into the joint between the two parts.
Silver solder is preferable when working with copper, copper alloys and stainless steel
and aluminium solder for working with aluminium and aluminium alloys.
Advantages of brazing:
Good mechanical strength, perfectly leaktight, good flexibility of the brazed part, easy
to achieve.
Constraints in brazing:
Requires extremely precise preparation, parts have to overlap, not recommended for
parts subjected to tremendous stress or heated to temperatures equal to or higher than
600-650°C for silver solder or 500-550°C for aluminium solder.
Main applications:
Copper piping for sanitary, central heating or gas installations, stainless steel or alumi-
nium parts.
Implementation:
a) Preparation: Strip the adhesion zones carefully. The joints should be perfectly clean,
degreased and deoxidised; provide for pushing pipes together or overlapping sheets,
adjust them carefully for low, regular clearance in the order of 0.1 to 0.3 mm, coat the
adhesion zones with flux and place the parts in position for brazing.
b) Performing the operation: Heat the entire assembly using the flame envelope. The
heating power will based on the density of the parts being joined (see Table on page
58). Wait for the flux to blister, dry and melt. Then bring the brazing rod into contact
with the overlapping joint on the parts. The solder should melt on contact with the
parts if they are at the correct temperature. The solder infiltrates into the joint by
capillary action.
Keep the assembly at the correct temperature by heating it with the flame envelope and
deposit the filler metal until a continuous bead is obtained the length of the join.
BRAZING
57
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OXYPOWER