File:Factory and industrial management (1891) (14594935157).jpg

Identifier: factoryindustria35newy (find matches)
Title: Factory and industrial management
Year: 1891 (1890s)
Authors:
Subjects: Engineering Factory management Industrial efficiency
Publisher: New York (etc.) McGraw-Hill (etc.)
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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it permits the brazing of thinsteel plates which hitherto must be riveted or clinched together, neitherof these latter methods being satisfactory for producing a thoroughlytight joint. The blow-pipe is further most valuable for use whereverit is necessary to work upon parts already in place, as, for example,in joining pipes and tubes, steam conduits, etc. It comes into playparticularly in the manufacture of metal tanks, various vessels madeof enamel ware, feed-water heaters, etc., permitting the manufactureof forms of apparatus requiring numerous and complicated jointsimpossible to manufacture by forging. It has the further advantageof being a light apparatus, easily manipulated and requiring no elab-orate installation. At first sight it might appear that the melted or cast metal pro-duced would not have the qualities of strength, and particularly ofelasticity, shown by rolled or hammered material. Surprising results,however, are secured when care is taken during the process to avoid
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METAL CUTTING AXD IVELDIXG BY fUSTOX. 5s9 overheating or oxidation of the metal, or its alteration by the intro-duction of impurities such as sulphur or phosphorus. If, for example,we braze thin sheets or tubes of a few millimetres thickness and sub-ject the brazed part to a light hammering or even a mild tempering,the metal will be found perfectly ductile and the joint will exhibit astrength almost equal to the resistance of the original metal. Tubesthus welded may be crushed or twisted, and plates may be bent andrefolded, following the weld, without showing any cracks. When it comes to the brazing of comparatively thick plates suchas those of a boiler, the problem is more complicated because of thegreater difficulty of producing uniform, thorough fusion to a thicknessexceeding 6 or 8 millimetres. Under such conditions use is oftenmade of an artifice which should be condemned, and which has tosome extent discredited autogenous soldering of heavy plates. Thisartifice consists in chamf

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