ISO 9692-4:2003

Overview

ISO 9692-4:2003, "Welding and allied processes - Recommendations for joint preparation - Part 4: Clad steels", provides guidance on joint preparation specifically for clad steels. It is part of the ISO 9692 series and gives recommended types of joint designs and dimensions to achieve sound welded joints where a parent metal is covered by a cladding layer. The standard is intended to be used alongside welding practice guidance (see EN 1011-5 / ISO TR 17671-5 for welding of clad steels).

Key topics

• Scope and purpose
  • Recommendations for joint preparation for all types of weldable clad steels.
  • Applicable to common welding processes used on steels (refer to other parts of ISO 9692 for process-specific guidance).
• Joint types and configurations
  • Four main categories are covered in detail (presented in Tables 1–4):
    • Clad steels welded from both sides
    • Clad steels welded from both sides with cladding removal
    • Clad steels welded from one side
    • Clad steels incorporating a backing, insert or cover strip
  • Tables specify recommended joint geometries and dimensional guidance (angles, root face, gaps, cladding removal width/depth).
• Cladding management
  • Guidance on removing cladding where necessary (for example, to avoid dilution or to prepare a sound root).
  • Notes on protecting adjacent cladding from grinding particles during preparation.
• Special material considerations
  • Flags cases where a deviation from the recommended preparations may be required - for example, clad steels with cladding of titanium, zirconium or their alloys because of risk of brittle phases.
• Normative references
  • Direct cross-reference to EN 1011-5 (Welding - recommendations for welding of clad steels) for welding procedure details and additional recommendations.

Applications and users

Who benefits from ISO 9692-4:2003:

• Welding engineers and fabricators developing joint designs for clad steel components
• Welding procedure writers, inspectors and quality assurance personnel
• Plant designers and structural engineers specifying welding details for clad pressure vessels, chemical plant equipment, pipelines and corrosion-resistant overlays
• Standards bodies and training organizations

Practical value:

• Ensures consistent, reproducible joint preparation to protect the integrity of cladding
• Helps avoid welding defects, cladding contamination and brittle microstructures
• Supports selection of appropriate backing, inserts or cladding removal techniques to suit fabrication needs

Related standards

• ISO 9692 series (Parts 1–3) - joint preparation recommendations for other materials and processes
• EN 1011-5 / ISO TR 17671-5 - welding recommendations specifically for clad steels

Keywords: ISO 9692-4:2003, clad steels, joint preparation, cladding removal, V-butt, U-butt, backing strip, welding recommendations.