Overview
SIST EN ISO 15614-9:2026 specifies the requirements and methods for the specification and qualification of welding procedures for metallic materials in underwater hyperbaric wet welding environments. This standard outlines the process for qualifying preliminary welding procedure specifications (pWPS) through welding procedure tests, ensuring that welded joints meet the necessary mechanical and quality characteristics for both production and repair welding.
The document is applicable specifically to the fusion welding of steels categorized under groups 1, 2, 3, and 8 according to ISO 15608, and addresses the main welding processes relevant for hyperbaric wet environments: manual metal arc welding (process 111) and self-shielded tubular-cored arc welding (process 114) as defined by ISO 4063.
Key Topics
- Procedure Qualification: Defines how to develop, test, and assess a preliminary welding procedure specification (pWPS) to ensure it produces suitable welds under hyperbaric wet conditions.
- Applicable Welding Processes: Focuses on manual metal arc (111) and self-shielded tubular-cored arc welding (114) in underwater environments.
- Material Groups: Targets steel materials in groups 1, 2, 3, and 8, following ISO 15608 guidelines.
- Weld Quality Levels: Introduces three weld quality classifications:
- Level A: Comparable to surface welding standards.
- Level B: Sufficient where reduced weld joint properties can be tolerated.
- Level Z: Meets alternative standards or specific agreements for underwater environments.
- Testing and Qualification: Outlines the essential and non-essential welding variables that must be considered, including joint type, base material, filler material, welding position, and environmental factors.
- Depth Limitations: Defines maximum and minimum depths for which the qualified procedures are valid, covering different steel groups and filler metals.
- Documentation Requirements: Specifies the need for a comprehensive Welding Procedure Qualification Record (WPQR) and a Welding Procedure Specification (WPS) aligned with ISO 15609-1.
Applications
This standard provides significant practical value across industries where underwater welding is critical, including:
- Offshore Construction and Oil & Gas: Supports safe and reliable installation, repair, and maintenance of submerged infrastructure such as platforms, pipelines, and risers.
- Shipbuilding and Marine Engineering: Enables repair and refurbishment of hulls, propellers, and underwater appendages without the need for dry-docking.
- Hydroelectric Facilities and Dams: Facilitates modifications, strengthening, or repairs to submerged steel structures.
- Civil Engineering: Applicable to bridges, tunnels, and steel reinforcements in submerged or partially submerged settings.
- Salvage Operations: Assists in rescue and recovery efforts where underwater repairs are needed to secure or recover vessels.
By adhering to SIST EN ISO 15614-9:2026, organizations ensure that their underwater welding procedures are robustly qualified, improving safety, reliability, and regulatory compliance.
Related Standards
- ISO 15608: Provides the grouping system for steels, supporting material selection and qualification.
- ISO 4063: Describes welding process numbers and definitions, referenced for process applicability.
- ISO 15609-1: Specifies requirements for welding procedure specifications (WPS).
- ISO 15618-1: Outlines qualification testing for welders engaged in underwater welding.
- ISO 148-1, ISO 4136, ISO 5173, ISO 5178, ISO 6892-1: Cover destructive and non-destructive weld testing methods.
- ISO 17636, ISO 17637, ISO 17639, ISO 17640: Provide methodologies for visual, radiographic, ultrasonic, and macroscopic examination of welds.
- ISO/TR 25901-1: Contains general terms and vocabulary for welding and related processes.
SIST EN ISO 15614-9:2026 is integral for any organization involved in underwater fusion welding of steels, ensuring that procedure qualification is conducted according to internationally recognized best practices for safety and quality.