Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . The nozzles of all oxy-acetylene torches suffer in time fromthe intense heat of the flame. Constant back-firing, caused byholding the torch too close to the work, will soon burn out the of melted metal will get in the tip, and should be removedcarefully. The burner is a very sensitive tool. The up-to-date torch is a handy affair with cocks at the handleend to turn the gases on and off and a small detachable tip orburner at the nozzle end. The gases are mixed near the orificein the low-pressur
Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . The nozzles of all oxy-acetylene torches suffer in time fromthe intense heat of the flame. Constant back-firing, caused byholding the torch too close to the work, will soon burn out the of melted metal will get in the tip, and should be removedcarefully. The burner is a very sensitive tool. The up-to-date torch is a handy affair with cocks at the handleend to turn the gases on and off and a small detachable tip orburner at the nozzle end. The gases are mixed near the orificein the low-pressure torch. In the high-pressure torch the gasesare mixed in the tip (Fig. 35). In both torches the acetylene is 78 WELDING first passed through a packing of asbestos, wire gauze, etc., withhandle which prevents a flash back into the generator, on theprinciple of the Davy lamp. The torches are in several stand-ard sizes, each with five or six graded detachable tips. Anextra oxygen tube can be clamped on the burner when used forcutting metals. Special cutting torches (Fig. 36) are now Fig. 35.—Diagram of replaceable tip of high-pressure torch (Davis-Bournonville Company). A new cutting head is screwed into the torch head. The pureoxygen jet flows through the center and in front, and behindthis are two small heating flames, four in all. With this torchit is possible to cut in any direction. To summarize, there are at present in use in this country threetorches: I. The original Fouche torch, improved, in which the gasesare mixed as they enter the haft.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1910
