Oxy-acetylene welding and cutting : electric, forge and thermit welding, together with related methods and materials used in metal working and the oxygen process for removal of carbon by Manly Harold P. (Harold Phillips) b. 1887

Author:Manly, Harold P. (Harold Phillips), b. 1887
Language: eng
Format: epub
Tags: Oxyacetylene welding and cutting
Publisher: Chicago : F.J. Drake
Published: 1916-03-25T05:00:00+00:00

Figure 25.—Preheating at A While Welding at B. C also May Be

Heated

that the expansion of the heated part will serve to draw the edges of the weld apart. Whatever part of the work is heated to cause expansion and separation, this part must remain hot during the entire time of welding and must then cool slowly at the same time as the metal in the weld cools.

An example of heating points away from the crack might be found in welding a lattice work with one

of the bars cracked through (Figure 25). If the strips parallel and near to the broken bar are heated gradually, the work will be so expanded that the edges of the break are drawn apart and the weld can be successfully made. In this case, the parallel bars next to the broken one would be heated highest, the next row not quite so hot and so on for some distance away. If only the one row were heated, the

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