Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . Fig. 52.—Galvanized tank witn oxy-acetylene welded end piece (heat expansionwould shear rivets). on account of its shortness, the fires being banked and boilertemperatures changed so frequently. No trouble has been ex-perienced with any of the welded parts. Repairing Corroded Parts on the Cholon: Oxy-acetylene welding may be used to add metal directly tothe surfaces of plates, to repair corroded spots, such as are fre-quently found in various parts of boilers. The flame of theblowpipe is directed upon t
Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . Fig. 52.—Galvanized tank witn oxy-acetylene welded end piece (heat expansionwould shear rivets). on account of its shortness, the fires being banked and boilertemperatures changed so frequently. No trouble has been ex-perienced with any of the welded parts. Repairing Corroded Parts on the Cholon: Oxy-acetylene welding may be used to add metal directly tothe surfaces of plates, to repair corroded spots, such as are fre-quently found in various parts of boilers. The flame of theblowpipe is directed upon the plate, and when the latter begins HOW TO WELD loS to melt the workman presents to the flame a bar of soft steelabout 7 by 7, which melts and fixes itself in drops on the corrodedsurface. The repairs of the Marsa, already referred to, give a sampleof the value of the welding process, but the work performedon the Cholon, of the Compagnie des Chargeurs Reunis, fromAugust 20 to September 20, 1906, presents a still more Fig. 53.—Welded cylinder. Oxy-acetylene process. The eighteen corrugated furnaces of this steamer werebadly eaten away on the surface. There was corrosion on eachside and for some distance above the grate bars. The work was difficult to perform, as the workmen werecompelled to be inside of the boilers; and were inconveniencedby the heat of the blowpipe flame; and the places to be weldedwere lower than the workmens footing; 10,000 cubic feet ofdissolved acetylene and as much of oxygen were used; about 200pounds of steel were used to cover the corrosions and restorethe plates to their original thickness. This work, at a total io6 WELDING cost of $2,400, avoided the replacing of eighteen furnaces, asoriginally ordered by the government inspectors. Acetylene Welding versus Riveting.—The approximatestrength of single-riveted boiler plate is 55 per cent.; of double-riveted, 70 per cent. L. L. Bernier, in the Boiler Maker, givesthe ratio of cost of a
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