3
Heating Cable Repair
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Apply more flux completely around both ends of the
corrugate, about 1/4 in (6 mm) past the end of the
corrugate union; this will help prevent discoloration of
the corrugate. Next, braze the corrugate to both ends of
the corrugate union using a large flame (see Appendix
E). To avoid damage to the thin corrugate, hold the flame
on the corrugate union, not on the corrugate (Figure 13).
Approximately 1 in (25 mm) of braze rod should be used
for each side of the union/corrugate joint.
Once the union has been brazed, use emery cloth and the
nylon mesh sanding pad to clean the corrugate union and
corrugate. Use only the nylon mesh sanding pad on the
corrugate; it has a thin sheath and can be easily damaged.
Emery cloth may be used on the corrugate union. Remove
all flux.
Note: Always ensure all flux has been removed
from the corrugate to prevent corrosion. Hot water may
be used to remove the flux.
Large flame
Apply flux around
1/4” (6 mm) length
of corrugate union
Apply flux around
1/4” (6 mm) length
of corrugate union
Silver braze
rod
Figure 13: braze corrugate union to corrugate
