ISO 18594-2007 PDF

Full title and description

Resistance spot-, projection- and seam-welding — Method for determining the transition resistance on aluminium and steel material. This International Standard specifies a laboratory measurement procedure and experimental set-up to determine transition (contact) resistance for single sheets or two overlapping sheets of aluminium or steel, with or without surface treatment or coating.

Abstract

ISO 18594:2007 defines the measuring arrangement, specimen preparation, test sequence, instrumentation requirements and calculation/reporting of transition resistance values relevant to resistance spot, projection and seam welding. It provides a repeatable method for quantifying electrical contact and bulk contributions to measured resistance and for reporting statistical results.

General information

• Status: Published / current (International Standard, subject to periodic review; confirmed in ISO review cycles).
• Publication date: March 2007 (first edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 25.160.10 (Welding processes).
• Edition / version: Edition 1 (2007).
• Number of pages: 11 pages (original ISO document); some national/adopted versions (for example EN adoption) cite a slightly different page count in published national-format versions.

Scope

Specifies the procedure and experimental set-up for determining the transition resistance of a single sheet or two overlapping sheets of aluminium or steel, applicable with or without surface treatment and with or without surface coating. The method is intended for laboratory measurements that feed into resistance-welding process development, quality control and research.

Key topics and requirements

• Definition and measurement principle for transition resistance (Rt) and set-up resistance; R = U / I and Rt = measured total − set-up resistance.
• Specified measuring arrangement: electrode and sensing clamp locations, electrode types and dimensions, force application and timing (e.g., measurement after specified contact time).
• Test specimen requirements and sampling recommendations (minimum measurements and spacing to capture variability).
• Equipment tolerances and instrumentation resolution (d.c. power source, voltmeter sensitivity and micro-ohm level measurement capability).
• Statistical treatment and reporting: calculation of mean Rt, standard deviation, coefficient of variation and required report content (including test conditions and identification).

Typical use and users

Used by welding engineers, laboratory technicians, quality-control teams and researchers in industries that employ resistance welding (for example automotive, appliance and light‑metal fabrication). It is applied during process development, validation, troubleshooting of weld electrical contact issues and comparative research on electrode, coating or surface-treatment effects.

Related standards

EN ISO 18594 is produced in cooperation with CEN and is often published as EN ISO 18594:2007 in Europe; it is part of the suite of ISO/CEN documents addressing resistance welding practice, electrode specification and test methods. Standards on electrode caps, electrode materials and other resistance‑welding test methods are commonly used alongside ISO 18594.

Keywords

transition resistance, contact resistance, resistance welding, spot welding, projection welding, seam welding, aluminium, steel, measurement procedure, test method, electrodes, set-up resistance.

FAQ

Q: What is this standard?

A: ISO 18594:2007 is an International Standard that specifies a laboratory method for determining the transition (contact) resistance in resistance spot, projection and seam welding for aluminium and steel materials.

Q: What does it cover?

A: It covers the measuring arrangement, specimen preparation, test procedure, instrumentation requirements, calculation of transition resistance and reporting requirements for repeatable laboratory measurements on single or overlapping sheets (with or without surface treatments/coatings).

Q: Who typically uses it?

A: Welding engineers, test laboratories, quality-control personnel, researchers and manufacturers using resistance welding processes (notably in automotive and metal‑fabrication sectors).

Q: Is it current or superseded?

A: Published in March 2007 (first edition). The document has undergone ISO periodic review cycles and has been confirmed in reviews; it remains the current ISO document for this method unless a newer revision is published by ISO. Users should check their national standards body or ISO for any later revisions or replacements.

Q: Is it part of a series?

A: It is part of the body of ISO (and EN ISO) standards on resistance welding prepared by ISO/TC 44 (Welding and allied processes) and is commonly used together with other resistance‑welding standards (electrode specifications, practice and test methods).

Q: What are the key keywords?

A: Transition resistance, contact resistance, resistance welding, spot welding, projection welding, seam welding, electrodes, measurement procedure.