Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . restrictions apply for allfuel used as apply for welding (see page 4). The fuel shouldbe free from sulphur and soot and the flame should be non-oxidizing. In the case of coal and coke, do not let the fuel touchthe parts to be brazed. As in welding, a gas flame is the best. The operator can buildup a furnace of fire-brick, with one or more nozzles of gas pipe Brazing and Soldering, James F. Hobart, 1908. BRAZING AND SOLDERING 167 intruding. He can then regulate the size and direction of theflame, and hea
Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . restrictions apply for allfuel used as apply for welding (see page 4). The fuel shouldbe free from sulphur and soot and the flame should be non-oxidizing. In the case of coal and coke, do not let the fuel touchthe parts to be brazed. As in welding, a gas flame is the best. The operator can buildup a furnace of fire-brick, with one or more nozzles of gas pipe Brazing and Soldering, James F. Hobart, 1908. BRAZING AND SOLDERING 167 intruding. He can then regulate the size and direction of theflame, and heat and cool the work slowly and evenly. Brazing work requires high temperatures: for iron it is doneat a bright red, almost white, heat. This explains why the flameshould be reducing and free from sulphur. The gas flame varies from a blowpipe flame to that given bya two-way injector tube made of gas piping (see Fig. 89). Theflame is a bunsen flame, with a blue cone. To braze requires considerable variation in practice, accord-ing to the work at hand. Suppose the worker is about to braze. Fig. 89.—Air-gas torch for brazing. together two cast-iron pieces of a fractured bar. He first cleansthe ends of the bar at the fracture by filing and scraping awayall grease and paint and then cleans the fracture with a wirebrush. He then brushes the borax on the fresh surfaces or, incase a liquid preparation is used, he applies it with a then places the pieces together as he intends to braze them,resting them on fire-brick, and bmlds up a little oven of brickaround and over the pieces, leaving one wafl of the oven openfor the flame (see Fig. 90). When brazing pieces or mending i68 WELDING fractures, always press the surfaces as closely together as joint is too tight for the spelter to enter, while the tightestjoint will be the strongest. The burners are then brought up in front of the open ovenand pointed at the work. These burners, for job work, are com-monly made of tw
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