Autogenous welding of metals : tr. from reports of the National School of Arts and Trades of France by Bernier Louis Leon 1862-

Author:Bernier, Louis Leon, 1862-
Language: eng
Format: epub, pdf
Tags: Welding
Publisher: New York : The Boiler maker
Published: 1908-03-25T05:00:00+00:00

foundation, and experience has shown the imperfect working of these blow-pipes.

By a special adjustment of its blow-pipes the B. R. C. Company has realized the grouping in a head easily removable of all the parts, the form and section of which is variable with the required flow. The result is that with only one body of blow-pipe and a series of these removable heads, it is possible to obtain a great variety of flows, rendering possible the execution of very different classes of work.

This disposition is of value for the shops where oxyacety-lene welding is seldom made, and on pieces of very different thicknesses.

3d. General comparison between the blow-pipes of the first class (gas under pressure) and those of the second class (one gas driving in the other.)

Certain shops, noticing marked differences between the work obtained with the same gases (acetylene and oxygen), but in one case with blow-pipes of the first class (gas under pressure), and in the other with blow-pipes in which one gas forces in the other, came to the conclusion that the former were superior to the latter.

This superiority, although real, is not, however, as great as one might be tempted to believe, because if certain blow-pipes where one gas brings the other in are not carefully watched, the few types generally used in the shops admit of a complete mixture of the gases and of a perfect mixture, the flame of which is in all respects similar to that of the other blow-pipes.

The inferiority, if it may be so called, of the blow-pipes of the second class, arises from the following fact:

When the workman starts to work and regulates the flame of his blow-pipe, its mouth is at the same temperature as the surrounding air. In the course of the work the diameter of this mouth increases in a certain proportion on account of the heat; on the other hand, particles of melted metal or oxide are always projected and may obstruct this mouth more or less. The result is that the volume of the issuing mixture is variable during the work.

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