7931 (ISO International Standard InTE RNATIONAL ORGANiZATION FOR STANDARDizATION MEXyHAPOAHAR OPrAHW3ALWR IO CTAHAAPTM3AuWM-ORGANISATION INTERNATIONALE DE NORMALISATION Insulation caps and bushes for resistance welding equipment Capuchonsetbagues isolantespourlesmaterielspoursoudageparresistance First edition - 1985-06-01 UDC 621.791.76.039 Ref. No. ISO 7931-1985 (E) ISO 7931-1985 (E) Descriptors : welding, resistance welding, welding equipment, welding accessories, dimensions, designation, marking. Price based on 2 pages Copyrightlntenatinal Organizationfor Standardization ed without license from IHS Not for Resale Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IsO Council. They are approved in accordance with IsO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7931 was prepared by Technical Committee ISO/TC 44, Weldingandalliedprocesses International Organization for Standardization, 1985 ? Printed in Switzerland CopyrightIntenationalOrganizationfor Standardizatin letworking permitted without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 7931-1985 (E) Insulation caps and bushes for resistance welding equipment 1 Scope and field of application 3.1.3 Marking This Internationat Standard specifies dimensions and re- Insulation caps to this International Standard shall be marked quirements for insulated caps and bushes in the secondary with the letter C. circuit for resistance welding equipment, especially for use in back-ups according to Iso 5827. 3.1.4 Designation The designation for an insulation cap C which conforms to this 2 References International Standard shall be as follows : IS 887, Plain washers for metric bolts, screws and nuts Insulation cap ISO 7931 - C General plan. 3.2 Insulation bushes B ISO 4762, Hexagon socket head cap screws - Product grade A. Insulation bushes B shall have the dimensions given in figure 2 and the table. ISo 5827, Spot welding - Electrode back-ups and clamps. Dimension in millimetres d. 3 Dimensions d2 3.1 Insulation caps C Insulation caps C shall have the dimensions shown in figure 1. Dimensions in millimetres, surface roughness value in micrometres 5 2 ds d. Sphere Φ 80 @ 8 H 10 ds 20/ Φ14 Figure 2 - Insulation bush Figure 1 Insulation cap Table - Dimensions 1) Dimensions in millimetres 3.1.1 Material Size d,2) d2 d3 d. ds [1 12 The material from which the insulation caps are manufactured 13 6 10,5 6,4 9,5 16 7 20 shall be high-strength insulating material, e.g. glass fibre re- 17 13,5 8,4 11,5 20 9 22 8 inforced polyamide. 10 16,5 10,5 14 24 11 24 19 13 12 21 19,5 16 27 13 26 3.1.2 Finish 1) Where the hole diameter is considerably larger than the diameter d or slotted holes are used, a washer is necessary to support the bush. The finish shall ensure that the edges are chamfered and the grooves rounded. 2) For information only. 1 Copyright International Organization for Standardization Not for Resale ed without license from IHS