BS EN ISO 8167:2021 pdf download.Resistance welding — Embossed projection welding — Projections for resistance welding.
1 Scope This document specifies the geometries and dimensions of projections for embossed projection welding. Tools to make the projections are also included in Annex B. The projections are used on hot-rolled, cold-rolled, uncoated and coated steels, stainless steels and nickel alloys for conventional welding quality up to 3 mm thickness, as single projections, in multiples or as a group of multiples. Any solid projections are not included in this document.
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 17677-1, Resistance welding — Vocabulary — Part 1: Spot, projection and seam welding
For the purposes of this document, the terms and definitions given in ISO 17677-1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at https://www.electropedia.org/
3.1 spherical projection projection with circular protrusion (see Figure 1) Note 1 to entry: The type code for spherical projection is SP.
3.2 ring-shaped projection annular projection projection with ring-shaped protrusion (see Figure 2) Note 1 to entry: The type code for ring-shaped projection is RP. Note 2 to entry: In the United States, a kind of solid projection is called “annular projection”.
3.3 elongated projection projection with oval protrusion (see Figure 3) Note 1 to entry: The type code for elongated projection is EP.
In the case of multiple projection welding with spherical and ring-shaped projections in one operation,more severe tolerance control for the projection height is required. The height of the individual projections on any of the components comprising the assembly shall not vary by more than 5 % from one another.
The projection should be made in the thicker sheet with the dimensions determined according to the thinner sheet thickness.
When welding sheets of dissimilar materials, the projection should be made in the material with the lower heat conductivity and/or higher strength.
Alternative projection dimensions can be found in Annex C.
NOTE 1 The height, a, is determined by the punch stroke when using open bottom die.
NOTE 2 Annex A indicates the relationship between sheet thickness, t, and projection diameter, d 1 , for spherical projections.BS EN ISO 8167 pdf download