ISO 18278-3:2017 PDF

Overview

ISO 18278-3:2017 - "Resistance welding - Weldability - Part 3: Evaluation procedures for weldability in spot weld bonding" specifies standardized test procedures for evaluating spot weld bonding performed by resistance spot welding combined with adhesive bonding. The standard defines how to determine the acceptable welding current range and to estimate electrode life for prepared assemblies of uncoated and coated metal sheets with individual thicknesses from 0.4 mm to 6.0 mm.

Key topics and technical requirements

• Scope and purpose: Procedures to assess weldability in spot weld bonding (resistance spot welding through an adhesive or sealant).
• Weld bonding equipment: Requirements for electrodes (per ISO 5182 / ISO 5821), adhesive dispensing, storage chamber temperature control and welding current setup.
• Welding current: Type (AC or DC) must be recorded; for AC, welding current shall be not less than 30% RMS at full conduction angle. Constant-current control is required.
• Mechanical settings: Recommendations to reduce electrode impact (e.g., electrode approach speed ≈ 0.15 m/s, peak force