See also:pipe or hollow cylinder . Tubes
See also:play an important
See also:part in
See also:engineering and other
See also:works for the
See also:conveyance of liquids or gases, and are made of diverse materials and dimensions according to the purpose for which they are intended,
See also:metal pipes being of the greatest consequence . According to the
See also:process of manufacture metal tubes may be divided into seamed and seamless . One of the earliest uses of seamed wrought-iron tubes was for
See also:gun-barrels, and formerly these were made by taking a
See also:strip of wrought iron, bending it so that the edges overlapped and then
See also:welding by hammering, with or without the aid of grooved swages . The development of
See also:lighting increased the demand for tubes, and in 1824
See also:Russell introduced the butt-welded
See also:tube, in which the edges of the skelp are not 'made to overlap, but are brought into closest possible contact and the welding is effected in a
See also:double swage, having corresponding grooves of the diameter of the tube required; this method required no mandrel as did those previously in use . The following
See also:year saw another improvement in making these pipes, when Cornelius Whitehouse. effected a butt weld by
See also:drawing the bent skelp through a die . Stronger tubes are obtained by using grooved rollers instead of a die, the skelp being mounted on a mandrel . This is the method commonly adopted at the
See also:day for making this class of tube . Seamed tubes, especially of copper and brass, are made by brazing or soldering the edges of the skelp . Another method is to
See also:bend the edges so that they interlock, the contact being perfected by
See also:rolling . Seamless tubes, which are stronger than those just described, are made by drawing a
See also:bloom of the metal perforated by an axial hole or provided with a core of some refractory material, or, in certain cases, by forcing the plastic metal by
See also:hydraulic pressure through an appropriate die . The seamless
See also:steel tube
See also:industry is now of
See also:great dimensions owing to the development of steam engineering .
Another type of seamless tube is the
See also:cast-iron tube, usually of large diameter and employed for gas and
See also:water mains; these pipes are made by casting .
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