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step5 : Heating & Applying
Several heating methods are used for silver brazing in air. They include hand
torch, fixed burner, induction and resistance heating. In addition for torch
or fixed burners different fuel gas combinations are available from oxy-acetylene,
oxy-propane, through to air natural gas.
For brazing it is essential that the parent metals be heated evenly to the correct
temperature. At the correct temperature for brazing the flux should be clear and
flow over the joint area. When brazing copper with an alloy from the Sil-fos or
Copper-flo range the metal should be a dull cherry red indicating the correct
temperature has been reached.
Brazing rod, strip or wire should then be touched onto the joint mouth.
Free flowing alloys will flow into and around the joint by capillary attraction.
A sluggish flowing alloy should be applied along the entire joint, building up
an alloy fillet.
Molten brazing alloy always flows to the hottest part of the joint. Heating should
continue as the alloy flows into the joint. For torch brazing indirect heating
should be used. Once brazing is complete heating should be discontinued.
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