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1. 发明专利

GB257581A Improvements in and relating to electric welding machines 未知
公开(公告)号：GB257581A
公开(公告)日：1927-03-31
申请号：GB1886426
申请日：1926-07-28
申请人： JOHN FISHER LAWSON
IPC分类号： B23K11/30
摘要： 257,581. Lawson, J. F. Aug. 27, 1925, [Convention date]. Collectors.-In an electric welding machine, particularly for welding tubes, current is conducted by an electrically conducting liquid, such as mercury, supplied to a crevice between a stationary member and a rotating member consisting of a roller electrode or a part connected thereto. Each electrode 15, which may be formed in one piece, or, as shown in Fig, 1, may consist of a copper disc 15 connected to an insulating disc 18 or to metal disc insulated therefrom, is connected by insulated bolts 21 to a ring 23 screwed to a collar 22 on a shaft 10. Current is conducted from the transformer terminals 34 by water-cooled stationary members 36, which are separated from the electrodes by a narrow crevice 41 to which mercury &c. is supplied on which the members rest by their own weight. The members rest on pins 50 on which the electrodes turn and are prevented from rotating by crossbars 52 fixed to the machine. The mercury is contained in wells 44 formed at the bottom of the members 36 and is raised to the top of the crevices by cavities 46 in the electrodes from which it is discharged into the crevices. Escape of mercury is prevented by gaskets 42 on the members 36 engaging grooves in the electrodes. The electrodes 56, Fig. 5, may be separated by an insulating plate 59 and connected by insulated bolts 58 to members 57, which are separated by crevices from stationary members 73 connected to the transformer terminals 74. Wells 80 in the members 73 have lips 81 engaging grooves 82 to the members 57 and the mercury is raised therefrom bv chambers 83 on the members 57 which are closed by perforated plugs 84, 84 , of which the plugs 84 have perforations 85 for outlet of mercury to the tops of the crevices. The outer walls of the chambers are screwthreaded at 88 to convey any mercury adhering thereto to the crevices, and gaskets 77 prevent escape of mercury from the crevices. The members 73 are bolted to and insulated from the journal boxes 69.

2. 发明专利

GB298273A Improvements in or relating to electric welding 未知
公开(公告)号：GB298273A
公开(公告)日：1928-10-08
申请号：GB1823027
申请日：1927-07-08
申请人： JOHN FISHER LAWSON
IPC分类号： B23K11/06
摘要： 298,273. Lawson, J. F. July 8, 1927. Pipes. - The longitudinal seams of pipes are electrically welded by causing an alternating current to flow across the seam which is fed lengthwise and submitted to pressure to complete the weld, the value of the current and its distribution lengthwise of the seam, the point at which the edges are brought together, the pressure and the speed of traverse being so correlated as to produce an intermittent weld, the interrupted portions bearing indications of having been heated to a higher temperature than the welded portions. Roller electrodes 2, which co-operate with one or more pressure rolls such as 4 whose axis is slightly behind that of the electrodes, are arranged at a relatively large angle and span a wide arc on the tube so that the centre of pressure is about 45‹ from the seam, so that the current enters and leaves the tube 1 at some distance from the seam, and thus furnishes a wide path for the current where it crosses the seam. The electrodes may be extended to a point close to the horizontal axis of the tube, the portion of the current passing under the tube being reduced by varying the pinch of the roll 4 to relieve the pressure of the tube against the heel of the electrode. The seam edges are brought together at a point 15 in advance of the point 16 in the plane containing the electrode axes bv an amount such that the seam in travelling between these points at a rate of 60 feet per minute receives three or five current impulses or half cycles of a 60 cycle alternating- current. The distance between these points is fixed by setting the main feed rolls and forming rolls or by an internal roll 17 supported by a bar 18. An arc is formed immediately in advance of the point 15 and to the rear thereof the tube shows highly heated or bright spots corresponding with this point and spaced apart a distance corresponding to the distance traversed between each impulse. These spots alternate with welded spots of darker colour. Minute holes caused by the arc may be eliminated or formed into lines by the pressure during welding and the welded spots form a series of sharp-pointed ovals placed end to end and divided lengthwise of the seam. This burr may be removed by hammers or by rollers 24, 28, 29 co-operating with rollers 25, 26, 27 on a mandrel mounted in an extension of the bar 18. The weld may be cooled by water applied at the point 23.

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