ISO 5623:2022 PDF

Plastics — Joining of thermoplastic moulded components — Specification for quality levels for imperfections

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Title (English):

ISO 5623:2022

Plastics — Joining of thermoplastic moulded components — Specification for quality levels for imperfections

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 17
Publication date:: September 16, 2022
Edition:: ISO IS 5623 edition 1 version 1
ICS:: 83.080.20

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Description (English):

This document specifies quality levels for imperfections in joints in thermoplastic moulded components due to the joining process. This document does not describe imperfections that can be generated either during service or present before joining, such as poor fit up. The correct preparation before joining is described in the relevant thermal joining process specification (TJPS), as defined in ISO 23512. Three quality levels are specified in order to permit application for a wide range of the following joining processes: a) ultrasonic welding; b) ultrasonic spot welding; c) infrared welding; d) hot gas convection welding; e) vibration welding; f) spin welding; g) laser welding; h) hot plate welding; and i) heat staking: hot air; electrical, infrared and ultrasonic. They are designated by symbols B, C and D, where B is the most stringent. The quality levels refer to production quality and not to the fitness for purpose of the manufactured product. NOTE Standards on joining of plastic pipes, fittings, valves and/or auxiliary equipment, and the assessment of the properties of the resulting joints are developed and maintained by ISO/TC 138.

Technical details

Technical committee: ISO/TC 61 - Plastics
SKU: ISO 5623:2022

Abstract

Overview

ISO 5623:2022 specifies quality levels for imperfections in joints of thermoplastic moulded components that arise from the joining process. It covers production-quality acceptance criteria for a wide range of thermal joining processes (ultrasonic, infrared, vibration, laser, hot plate, spin, hot gas convection, heat staking, etc.). The standard defines three graded quality levels - B (stringent), C (intermediate) and D (moderate) - and provides dimensional limits for common imperfection types. ISO 5623 is intended as a reference for application specifications and production inspection; it addresses imperfections caused by joining, not defects from prior poor fit-up or in-service damage.

Key topics and requirements

Three quality levels (B, C, D) mapped to DFMEA severity classes (B: 9–10; C: 6–8; D: 0–5). These levels are selected before production (preferably at enquiry/order stage).
Process coverage: ultrasonic welding, ultrasonic spot welding, infrared welding, hot gas convection welding, vibration welding, spin welding, laser welding, hot plate welding and heat staking (hot air, electrical, infrared, ultrasonic).
Imperfection types are listed and defined (examples include cracks, gas cavities, degraded polymer inclusions, lack of fusion, cold fusion, misalignment, excess weld material, thermal damage and tool marks).
Dimensional limits: imperfections are quantified (e.g., gas-cavity sum diameters and misalignment tolerances are specified as percentages of component wall thickness - commonly B ≤ 5%, C ≤ 10%, D ≤ 15% for cavities; misalignment limits similarly scale with quality level).
Inspection guidance: primarily aimed at visual testing; measurement can follow EN 12814‑5, EN 13100‑1/2/3 or other methods (computed tomography, active thermography, terahertz, laser scanning). Non‑destructive methods may require supplementary inspection criteria.
Use in quality systems: intended for drafting application specifications; allows different quality levels for different joints within the same component when required.

Practical applications

Use ISO 5623 when defining acceptance criteria for welded or joined thermoplastic parts in production.
Apply it in supplier contracts, incoming inspection plans, and production control to ensure consistent, documented criteria for joint imperfections.
Helpful for process engineers, quality engineers, designers and contract manufacturers to balance design requirements, service conditions and inspection costs.

Related standards

ISO 23512 - Thermal joining process specification (TJPS) and preparation before joining
EN 14728 - Designations of thermal joining imperfections (basis for table numbering)
IEC 60812 - Failure modes and effects analysis (FMEA/FMECA)
EN 12814‑5, EN 13100‑1/2/3 - Measurement and inspection references
ISO/TC 138 - Standards for joining plastic pipes and fittings

Keywords: ISO 5623, thermoplastic joining, quality levels, weld imperfections, ultrasonic welding, laser welding, hot plate welding, thermal joining, TJPS, production quality.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and requirements

Three quality levels (B, C, D) mapped to DFMEA severity classes (B: 9–10; C: 6–8; D: 0–5). These levels are selected before production (preferably at enquiry/order stage).
Process coverage: ultrasonic welding, ultrasonic spot welding, infrared welding, hot gas convection welding, vibration welding, spin welding, laser welding, hot plate welding and heat staking (hot air, electrical, infrared, ultrasonic).
Imperfection types are listed and defined (examples include cracks, gas cavities, degraded polymer inclusions, lack of fusion, cold fusion, misalignment, excess weld material, thermal damage and tool marks).
Dimensional limits: imperfections are quantified (e.g., gas-cavity sum diameters and misalignment tolerances are specified as percentages of component wall thickness - commonly B ≤ 5%, C ≤ 10%, D ≤ 15% for cavities; misalignment limits similarly scale with quality level).
Inspection guidance: primarily aimed at visual testing; measurement can follow EN 12814‑5, EN 13100‑1/2/3 or other methods (computed tomography, active thermography, terahertz, laser scanning). Non‑destructive methods may require supplementary inspection criteria.
Use in quality systems: intended for drafting application specifications; allows different quality levels for different joints within the same component when required.

Practical applications

Use ISO 5623 when defining acceptance criteria for welded or joined thermoplastic parts in production.
Apply it in supplier contracts, incoming inspection plans, and production control to ensure consistent, documented criteria for joint imperfections.
Helpful for process engineers, quality engineers, designers and contract manufacturers to balance design requirements, service conditions and inspection costs.

Related standards

ISO 23512 - Thermal joining process specification (TJPS) and preparation before joining
EN 14728 - Designations of thermal joining imperfections (basis for table numbering)
IEC 60812 - Failure modes and effects analysis (FMEA/FMECA)
EN 12814‑5, EN 13100‑1/2/3 - Measurement and inspection references
ISO/TC 138 - Standards for joining plastic pipes and fittings

Keywords: ISO 5623, thermoplastic joining, quality levels, weld imperfections, ultrasonic welding, laser welding, hot plate welding, thermal joining, TJPS, production quality.

ISO 5623:2022 PDF

Technical details

Abstract

Overview

Key topics and requirements

Practical applications

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Practical applications

Related standards

Related standards

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