METAL BODY REPAIR - OD1653 - LESSON 1/TASK 1
is still hot. After four or five hammer blows, the heated spot will turn
black. Quench it immediately with water and a rag or sponge. Quenching
with water will complete the shrinking operation. Repeat this operation,
taking the next highest spot in the stretched section of the panel, using
the sequence shown in figure 31.
FIGURE 30. UPSETTING A STRETCHED AREA
FOR SHRINKING.
FIGURE 31. SEQUENCE OF SHRINKING METAL.
(e) In case of a long narrow stretch caused by a sharp object rubbing
across the surface, start at one end and heat a spot to a bright red, three
inches long, in the bottom of the crease. While the spot is bright red, use
a body hammer to raise the metal above the surface of the panel. Repeat
42
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