ISO 17677-1:2021 Resistance welding — Vocabulary —Part 1: Spot, projection and seam welding

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Resistance welding — Vocabulary —

Part 1: Spot, projection and seam welding

1 Scope

This document establishes a vocabulary of terms and definitions for resistance spot welding, projection welding and seam welding.

NOTE In addition to terms used in English and French, two of the three official ISO languages, this document gives the equivalent terms in German; these are published under the responsibility of the member body for Germany (DIN). However, only the terms and definitions given in the official languages can be considered as ISO terms and definitions.

2 Normative references

There are no normative references in this document.

3 Terms a nd definiti ons

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 http:// www .electropedia .org/ 3.1 Welding and testing procedures

3.1.1

chisel test

test in which a chisel is driven between the sheets near to adjacent welds until either fracture occurs or until the metal near the weld yields or bends

3.1.2

cross tension test

tensile test of a resistance welded specimen to determine the mechanical properties and failure mode of the weld

3.1.3

cross-wire welding

projection welding (3.1.11) of crossed wires or rods

3.1.4

direct welding

resistance welding secondary circuit variant in which welding current and electrode force (3.3.5) are applied to the workpieces by directly opposed electrodes (3.2.1) and only one weld is made by one welding operation

Note 1 to entry: See Figure 12 for typical arrangements.

3.1.5

indirect welding

resistance welding secondary circuit variant in which the welding current flows through the workpieces in locations away from, as well as at, the welds

Note 1 to entry: See Figure 13 for typical arrangements.

3.1.6

multiple impulse welding

welding with more than one impulse

Note 1 to entry: See Figures 4 to 7 for related time and electrode force (3.3.5) diagrams.

3.1.7

multiple spot welding

spot welding in which two or more welds are made simultaneously in one welding operation

Note 1 to entry: Examples are parallel spot welding (3.1.8) and series spot welding (3.1.14).

3.1.8

parallel spot welding

resistance welding secondary circuit variant in which the secondary current is divided in parallel electrical paths to make two or more welds simultaneously

Note 1 to entry: See Figure 11 a).

3.1.9

peel test

destructive test in which a resistance-welded lap joint is tested by applying a peel force which results in stresses mainly in the thickness direction of the weld

3.1.10

pillow test

destructive test in which internal pressure is applied in order to test for leaks and the strength of a seam weld

3.1.11

projection welding

resistance welding in which the resulting welds are localized at predetermined points by projections, embossments or intersections, concentrating force and current by their geometry

Note 1 to entry: The projections are raised on, or formed from, one or more of the faying surfaces (3.3.16) and collapse during welding.

3.1.12

resistance spot welding

resistance welding process producing a weld at the faying surfaces (3.3.16) between overlapping parts by the heat obtained from resistance to the flow of welding current through the workpieces from the electrodes (3.2.1) serving to concentrate the welding current and pressure at the weld area

3.1.13

seam welding

resistance welding in which force is applied continuously and current is applied continuously or intermittently to produce a linear weld, the workpieces being between two electrode wheels (3.2.5) or an electrode wheel and an electrode bar

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