Methods of welding metals by Shaw James William

Author:Shaw, James William
Language: eng
Format: epub
Tags: Welding, Theses
Published: 1908-03-25T05:00:00+00:00

The flame therefore, consists largely of 00 which is "being converted at its extremity into CO . This with the hydrogen in real-ity forms a cool jacket which protects "both the molten metal and the inner cone of the flame from loss of heat.

At the moment of initial combustion, when the acetylene is decomposed into elements of C and H, ahout 300 E.T.U. per cu. ft. of the gas are generated. The total heat, hov/ever, generated per cu.ft. of acetylene is ahout 1500 B.T.U. which aside from the initial decomposition, is furnished mainly by the combustion in the 0 of the COg, and in a lesser degree by the combustion of H into water vapor.

6* Facts about the Safety of Acetylene Pure acetylene at a pressure of less than 30 pounds per sq. in. even when passed through pipes at a white heat is perfectly safe, but when mixed with oxygen or air is dangerous. An explosive gas mixture enclosed in a pipe does not inflame at once thruout the entire pipe, but from one end of the pipe ignition travels at a certain speed which increases as the square of the pipe section, therefore, to render safe the use of oxygen and acetylene in a blowpipe flame, the gas mixture is given a speed by pressure greater than the rate of projection of the flame.

7. Fluxes for Welding Metals not Requ ired.- No flux or moulds are required to weld metals such as iron, steel, or copper, but for alloys like brass and bronze, a little borax or boracic acid moistened with water is used, simply to prevent the volatilized zinc from being deposited on the parts and destroying the weld.

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