| 摘要 |
955,954. Welding by pressure. PHILIPS ELECTRICAL INDUSTRIES Ltd. March 11, 1963 [March 14, 1962], No. 9557/63. Heading B3R. In arc stud welding using an annular semiconductive slag-forming body interposed between the stud and the work, steps are taken to ensure that during the initiation of the arc through the body the body softens first at one predetermined side. This may be achieved by initially presenting the stud at an angle, by locating the stud eccentrically of the body or providing the stud with an extension on one side. Alternatively, the work may be shaped or provided with a local insulation or a local improvement of conductivity, e.g. by removing an oxide layer. Preferably, a specially formed annular body is used. The body 1, Fig. 1, has two work-engaging contact areas 7, 9 separated by cut-away portions 6. The other end of the body has a cylindrical recess provided with three equally spaced surfaces 3 engaged by the end of the stud 5. One surface 3 is in line with the contact area 7 to provide a preferential current path which in stud welding on a vertical or sloping plate 8 is positioned at the upper side. In a modification, the body 1 Fig. 4, is provided with a cardboard or like insulating sleeve 10 having an inturned portion 11 for gripping the stud and an extension 14 covering part of the work-engaging surface of the body 1. Alternatively, the preferential conductivity of portion of the body 1 may be provided by its shape, a localized conductive layer or a wire. Further, in a modification similar to that of Fig. 1, the body is provided with three work-engaging areas and two studengaging surfaces. |
