Welding and cutting metals by aid of gases or electricity by Groth L. A. (Lorentz Albert)

Author:Groth, L. A. (Lorentz Albert)
Language: eng
Format: epub
Tags: Welding, Metal-work
Publisher: London : A. Constable
Published: 1909-03-25T05:00:00+00:00

Fig. 82.

the gases produced escape, the combustible gases revive instantly, and the flame is ignited by itself. Fig. 82 illustrates a complete oxy-hydrogen welding plant.

The blowpipe introduced by L'Oxhydrique under the name of Pyrox, and patented in almost every civilised country, has during its existence of five years proved to be entirely satisfactory in its action, no accident whatever having occurred during the operations with same, which speaks greatly in favour of its safety and ability of keeping a homogeneous composition of the flame; besides, it is light in weight and easy to handle.

The extent of the hydrogen welding may be judged from

Digiti

zed by Google

the production of the gases required; for instance, the UOxhydiique Internationale, at Brussels, produce per day at their works 200,000 litres of oxygen and 400,000 litres of hydrogen. The UOxhydrique Frangaise, Paris, at their works at Saint-Andr6-lez-Lille (Nord); Beauval, by Trilport (Seine-et-Marne) ; Villeurbonne (Rhone) ; and Montbard (Cote-d'Or) produce per day more than 600,000 litres of oxygen and 1,200,000 litres of hydrogen. The gases are compressed at 125 atmospheres and delivered in ordinary steel cylinders, which latter are previously tested at 250 atmospheres' pressure.

The preference given to hydrogen welding, particularly on the continent of Europe, is attributed to the following facts, as summarised by UOxhydrique Frangaise : —

Comparison of Hydrogen and Acetylene Welding.

hydrogen welding. acetylene welding.

Installation,

The cost of the hydrogen The cost of the acetylene plant is from £7 to £15. plant varies from £36 to £72,

consequently four to five hydrogen plants could be obtained for the same expense ; besides, the acetylene generating plant cannot last for more than five years, representing an amortisation of nearly Is. per day.

By using acetylene-dissous, however, the generating plant may be sound.

Digiti

zed by Google

HYDROGEN WELDING

143

Uncei'tamty. There is no additional ex- To the above price must be

pense; the above price includes a complete hydrogen welding plant ready for immediate use.

added the cost of foundation and installation of the acetylene generator and washer, the laying of water-pipes for the maintenance of the generator, and a costly lead piping for the conveyance of the acetylene.

Facility of Installation.

The hydrogen welding plant does not require any installation ; furthermore, it may be placed anywhere.

The installation requires official authorisation and approval by insurance companies. The generator must be surrounded by sufi&cient air and protected against freezing and deterioration.

Danger

During a period of five years and with a registered number of more than 1,400 weldings, not one accident ha^ been recorded.

Notwithstanding all precautions taken, more than ten fatal accidents have occurred during three years, besides those which have taken place in the use of acetylene for other purposes than welding.

It should not be forgotten that acetylene is the most explosive gas existing.

Digiti

zed by Google

WELDING AXD CUTTING METALS

Application,

The hydrogen blowpipe is the most easy to handle.

The flame is not regulated according to its colour, to be judged by the welder, as is the case with the acetylene welding, but by a special indicator, which produces a saving of 15 to 20 per cent, as compared with previous arrangements.

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.