2. Repairing and correcting defects
Welding is used to fill surface cavities, while impregnation is used to restore watertightness.
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Autogenous welding is used
[B 7 730]
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The filler metal, in the form of rod or wire, must have a composition similar or identical to that of the part to be repaired. These products are not always commercially available, and the foundryman is often obliged to manufacture them himself.
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Repairing and correcting defects