If the parts being handled are of such a shape that there is danger of
bending a portion back of the weld, this part may be cooled by quickly
dipping it into water before laying the work on the anvil to be joined.
The workman uses a heavy hand hammer in making the joint, and his helper,
if one is employed, uses a sledge. With the two parts of the work in place
on the anvil, the workman strikes several light blows, the first ones being
at a point directly over the center of the weld, so that the joint will
start from this point and be worked toward the edges. After the pieces have
united the helper strikes alternate blows with his sledge, always striking
in exactly the same place as the last stroke of the workman. The hammer
blows are carried nearer and nearer to the edges of the weld and are made
steadily heavier as the work progresses.
The aim during the first part of the operation should be to make a perfect
joint, with every part of the surfaces united, and too much attention
should not be paid to appearance, at least not enough to take any chance
with the strength of the work.
It will be found, after completion of the weld, that there has been a loss
in length equal to one-half the thickness of the metal being welded. This
loss is occasioned by the burned metal and the scale which has been formed.
_Finishing the Weld._--If it is possible to do so, the material should
be hammered into the shape that it should remain with the same heat that
was used for welding.
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