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Hand Forging by Thomas F. Googerty
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JUMP WELDING
65
out when welding it. The bottom piece, 3 x 5/8 in., if intended to be 5/8in. thick when finished, should be heated in the center and upset; but if it is intended for a short forging, it is better to use a thicker piece, drawing it to size after the weld is made.
Fig. 36. Making a Jump Weld
use a thicker piece, drawing it to size after the weld is made.
After the pieces are prepared, the fire should be thoroughly cleaned and built up with a good bed of loose, well coked coal. The square piece is placed into the fire so that it may be handled with the right hand. It may be caught in the tongs at right angles to them. The flat piece is caught at one end with the tongs in the left hand. The pieces are heated slowly at first, in order to heat them throughout. Heating iron of this kind too quickly gets the outer parts hot and not the inside. The pieces, while heating, should be turned over once in a while, helping to promote an even heat. As the welding heat begins to rise, a little more blast should be turned on, gradually
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Hand Forging by Thomas F. Googerty