SIST EN ISO 22829:2018 PDF

Overview

EN ISO 22829:2017 - Resistance welding equipment - Transformers - Integrated transformer-rectifier units for welding guns operating at 1 000 Hz (ISO 22829:2017) specifies additional requirements for single-phase inverter transformer–rectifier units used for DC resistance welding. It applies to transformer-rectifier units primarily used in welding guns, designed to operate at 1 000 Hz with a rated input voltage of 500 V or more. The document augments and amends the general transformer requirements in ISO 5826.

Key topics and technical requirements

• Scope and applicability: Additional requirements to ISO 5826 for inverter transformers with rectifiers for DC welding at 1 000 Hz.
• Electrical characteristics: Minimum principal electrical ratings for standard transformer types (output current, no-load voltage, apparent input power) and requirement for manufacturer-supplied curves showing maximum output current vs duty factor and welding time.
• Mechanical dimensions: Specified overall sizes and mounting dimensions for standard types (see Annex B) so units are interchangeable in welding guns.
• Power supply requirements: Rated supply must be delivered by an inverter providing the rated voltage at 1 000 Hz in a waveform suitable for the unit.
• Additional equipment and safety:
  • Grounding provision: Case ground terminal and removable link from secondary midpoint to ground.
  • Thermal protection: Thermoswitches on rectifier and on primary/secondary windings, with defined wiring colours and positions.
  • Output sensing: Provisions for output current sensing coils and output voltage sensing wires.
• Rectifier protection: Specific protective measures for the rectifier assembly.
• Marking and designation: Requirements for primary/output terminal marking and rating plates.
• Testing: Type and routine tests (visual, open-circuit, minimum output under load, cooling circuit, dynamic output behaviour, mechanical strength).

Applications and practical value

• Used where compact, high-frequency transformer-rectifier assemblies are integrated directly into welding guns for DC resistance welding.
• Supports consistent performance, safety, interchangeability and reliable thermal and electrical protection in industrial resistance welding installations.
• Helps manufacturers provide rated output curves and dimensional compatibility, simplifying design and maintenance of welding systems.

Who should use this standard

• Transformer and welding-equipment manufacturers
• Welding-system designers and integrators
• Test laboratories and quality/ compliance engineers
• Procurement specialists specifying transformer-rectifier units for resistance welding

Related standards

• ISO 5826 - Transformers - General specifications
• ISO 669 - Resistance welding equipment - Mechanical and electrical requirements
• ISO 17677-1 - Resistance welding vocabulary (spot, projection, seam)
• IEC 60417 - Graphical symbols for use on equipment

Keywords: EN ISO 22829:2017, resistance welding equipment, transformer-rectifier units, 1 000 Hz, welding guns, ISO 5826, single-phase inverter transformers, DC welding.