-Splitting Ends to Be Welded in Thin Work]
The forms so far described all require that the pieces be laid together in
the proper position after removal from the fire, and this always causes a
slight loss of time and a consequent lowering of the temperature. With very
light stock, this fall of temperature would be so rapid that the weld would
be unsuccessful, and in this case the "lock" weld is resorted to. The ends
of the two pieces to be joined are split for some distance back, and
one-half of each end is bent up and the other half down (Figure 54). The
two are then pushed together and placed in the fire in this position. When
the welding heat is reached, it is only necessary to take the work out of
the fire and hammer the parts together, inasmuch as they are already in the
correct position.
Other forms of welds in which the parts are too small to retain their heat,
can be made by first riveting them together or cutting them so that they
can be temporarily fastened in any convenient way when first placed in the
fire.
CHAPTER VIII
SOLDERING, BRAZING AND THERMIT WELDING
SOLDERING
Common solder is an alloy of one-half lead with one-half tin, and is called
"half and half." Hard solder is made with two-thirds tin and one-third
lead. These alloys, when heated, are used to join surfaces of the same or
dissimilar metals such as copper, brass, lead, galvanized iron, zinc,
tinned plate, etc.
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