Instructions on welding and cutting of metals, oxyacetylene process by Vulcan process co

Author:Vulcan process co. [from old catalog]
Language: eng
Format: epub, pdf
Tags: Oxyacetylene welding and cutting, Metal-cutting
Publisher: Minneapolis, Minn., Cincinatti [!] Ohio, Vulcan process co.
Published: 1914-03-25T05:00:00+00:00

sion in the entire mass, and in this way equal contraction. But, as a matter of fact, complete heating is not necessary. It is sufficient to heat, simultaneously with the operation of welding, the parts 1 and 2 of the frame and thus obtain equal expansion to that of the broken bar; then, on cooling, the contraction, is of equal importance in the case of the two parallel bars and the repaired bar. Therefore there is no strain in the metal or break.

Suppose it were impossible to heat the frame at 1 and 2. Other methods are at the disposal of the welder; for example, a slight separation of the two bars 3 and 4 by bending separates the two edges to be welded. This done, proceed to weld, and at the end of the operation, that is to say, as soon as contraction commences, due to cooling, remove the keys, wedges, or screw jacks from between the sides 3 and 4. The return of the bent bars to their original position annuls the effect of contraction in the welded bar, and thus welded it should be free from strains, deformations, or breaks.

Another method is, although the success depends upon the thickness of the metal, to cut the frame at 5, execute the weld of the bar, and then weld at 5, the effects of contraction being least to be feared at this part. That is to say, sometimes we have to break a piece in order to repair it.

This example, taken from a hundred, shows the importance which the welder should attach to foreseeing the effects of expansion and contraction during the execution of the weld and on cooling. And this is evidently part of the "preparation of pieces," since it is not possible to guard against the consequences of these phenomena once the welding has commenced.

-52-

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.