WELDING
BASE OF BODY REPAIR
9-12
2. Silver alloy filler metal (silver solder)
Silver alloy filler metal consists of silver, copper,
zinc or cadmium, nickel, and tin, or other metals.
This filler metal is most applicable for the brazing
of steel and non-ferrous alloy other than alumin-
ium, magnesium, and others with low melting
points.
Notes with regard to brazing work
• Use a wire brush, sandpaper, file etc., to remove
any oxide film grease, dirt, etc., from the surfaces
of the panels to be brazed.
• When doing brass brazing, if the panels and the
filler metal are heated excessively, a weak iron-
copper alloy will form, which could crack easily.
Be careful not to apply excessive heat.
• The joint of the panels must overlap as indicated
in the illustration.
GAS WELDING
Gas welding is a method in which a high temperature flame is
used to melt both a welding rod and the base metal (panels) to
make a fused joint. Oxy-acetylene is the most common type of
gas welding. However, because of the extremely high tempera-
ture of the fused joint, the strength of the steel plate deterio-
rates, and there is a higher possibility of warping. This method,
therefore, is not very suitable for body repair.
.
The flame in gas welding can be classified according
to the ratio of acetylene and oxygen.
AB200044AB200044
AB
EXAMPLES OF BRAZED JOINTS
AB200049
DEPOSITE
BASE METAL
WELDING
ROD
OXY-ACETYLENE
FLAME
AB
AB200050AB200050
AB
FLAME CORE OUTER FLAME
ACETYLENE CONE
FLAME CORE OUTER FLAME FLAME CORE OUTER FLAME
1. CARBURIZING FLAME 2. STANDARD FLAME 3. PEROXIDE FLAME
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