Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . Fig. 25.—Showing how a bar is welded to a plate. Iron or brass pipe is butt-welded and also heated prepara-tory to bending. In England wrought-iron pipes are flangedvery successfully. A number of firms weld printers chases by this method. Thebars are held in the hands of the operator, are butt-welded, and THE THOMSON PROCESS 6i then right-angled on a frame. The burr or upset is trimmed offon a metal saw and ground even on a wheel. Chain is being welded by the electrical process; as fast as twolinks a mi
Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . Fig. 25.—Showing how a bar is welded to a plate. Iron or brass pipe is butt-welded and also heated prepara-tory to bending. In England wrought-iron pipes are flangedvery successfully. A number of firms weld printers chases by this method. Thebars are held in the hands of the operator, are butt-welded, and THE THOMSON PROCESS 6i then right-angled on a frame. The burr or upset is trimmed offon a metal saw and ground even on a wheel. Chain is being welded by the electrical process; as fast as twolinks a minute can be turned out on the smallest sizes. In thiscase some of the current, approximately lo to 30 per travelsaround the ring instead of over the joint. This loss of currentis expensive and stands in the way of the general adoption of this. Fig. 26.—Thomson specimens. Type bars, steel to brass; angle weld; bicyclefork; hoe; corner angle weld; chain, two welds; chain showing fin after welding;chain welded and fin removed. process to chain welding. But it is also claimed that this short-circuiting of part of the current causes the ring to heat suffi-ciently to bend with ease when the ends of the link are is claimed that a bar magnet thrust through the link to bewelded will largely prevent the current from traveling around thelink. In the welding of hoops and rings this same objection loss of current is much less for rings of large diameter and Iron Age, W. S. Gorton, July 27, 1905. 62 WELDING small gauge, and can be further reduced by placing the clampscloser than is the custom. Electric welding is much used in the manufacture of projec-tiles and the parts of machine guns. A special high-carbon headcan be welded on to a soft-steel projectile cartridge. Brass heads are joined to steel shanks for use
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1910
