ISO 23512:2021

INTERNATIONAL ISO
STANDARD 23512
First edition
2021-03
Plastics — Joining of thermoplastic
moulded components — Specification
of variables for thermal joining
processes
Plastiques — Assemblage de composants thermoplastiques moulés —
Spécification de variables pour les procédés d'assemblage thermique
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Technical content of thermal joining process specification (TJPS) . 3
4.1 General . 3
4.2 Related to the joining organization . 3
4.3 Related to the sub-component(s) . 3
4.4 Common to all joining processes . 3
4.5 Specific to a joining process . 4
4.5.1 Ultrasonic welding/staking/spot welding . 4
4.5.2 Infrared welding . 4
4.5.3 Hot gas convection welding . 5
4.5.4 Linear vibration welding . 5
4.5.5 Orbital vibration welding . 5
4.5.6 Spin welding . 5
4.5.7 Laser welding. 6
4.5.8 Hot plate welding . 7
4.5.9 Heat staking – hot air . 7
4.5.10 Heat staking – electrical . 7
4.5.11 Heat staking – infrared . 7
Annex A (informative) Template for TJPS: Ultrasonic welding/staking/spot welding .9
Annex B (informative) Template for TJPS: Infrared welding .11
Annex C (informative) Template for TJPS: Hot gas convection welding .13
Annex D (informative) Template for TJPS: Linear vibration welding.15
Annex E (informative) Template for TJPS: Orbital vibration welding .17
Annex F (informative) Template for TJPS: Spin welding .19
Annex G (informative) Template for TJPS: Laser welding .21
Annex H (informative) Template for TJPS: Hot plate welding .23
Annex I (informative) Template for TJPS: Heat staking – hot air .25
Annex J (informative) Template for TJPS: Heat staking – electrical .27
Annex K (informative) Template for TJPS: Heat staking – infrared .29
Annex L (informative) Worked example for TJPS: Hot plate welding .30
Annex M (informative) Worked example for TJPS: Heat staking – electrical .33
Bibliography .37
Foreword
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This document was prepared by Technical Committee ISO/TC 61, Plastics.
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iv © ISO 2021 – All rights reserved

Introduction
This document has been developed to help organizations better understand and implement controls
with thermal joining processes through the use of thermal joining process specifications.
INTERNATIONAL STANDARD ISO 23512:2021(E)
Plastics — Joining of thermoplastic moulded components
— Specification of variables for thermal joining processes
1 Scope
This document specifies the minimum essential variables in order to produce a component of the
required consistency and quality for the following thermal joining processes:
— ultrasonic welding/staking/spot welding;
— infrared welding;
— hot gas convection welding;
— linear vibration welding;
— orbital vibration welding;
— spin welding;
— laser welding;
— hot plate welding;
— heat staking: hot air;
— heat staking: electrical; and
— heat staking: infrared (IR).
This document defines the thermal joining process specification (TJPS) for each of the thermal joining
processes listed above, to ensure that all the essential variables are properly considered, including
the qualified range of each variable, in order to establish and maintain component quality at an
acceptable level.
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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 472, Plastics — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
dimensional report
full measurement report on product before welding including flatness at weld joint
3.2
essential variable
joining condition that influences the quality of the joint and requires qualification
3.3
joining organization
organization responsible for the serial production joining and maintenance of quality
3.4
joining procedure
specified course of action to be followed in making a joint, including the joining process(es) (3.5),
reference to materials, preparation, pre-heating (if necessary), control of process parameters and
necessary equipment to be used
3.5
joining process
method of softening or melting to obtain a permanent joint (3.7)
3.6
joining process qualification record
JPQR
record comprising all data of mechanical test results for the specified range of each essential variable
(3.2) needed for qualification of a TJPS, used by the joining organization (3.3) as part of the sign-off
documentation
3.7
joint
junction of two sub-components
3.8
moisture content
amount of moisture content in parent material at the time of welding (3.12)
3.9
process report
document confirming that the sub-component has been manufactured using the correct moulding
process parameters, conditions, material grade, masterbatch reference, masterbatch percentage, and
regrind percentage
3.10
thermal joining process specification
TJPS
document that has been qualified and provides the required variables of the joining procedure (3.4) to
ensure repeatability during production
3.11
visual examination acceptance criteria document
document specifying imperfections on sub-components that affect the functionality of the joint, such
as weld lines, burn marks, surface contamination
3.12
welding
process of uniting softened surfaces of materials, generally with the aid of heat
3.13
work instruction
simplified TJPS, suitable for joining process (3.5) owner
2 © ISO 2021 – All rights reserved

4 Technical content of thermal joining process specification (TJPS)
4.1 General
A TJPS shall provide the minimum information specified in 4.2 to 4.5 required to make a joint of
acceptable quality, as part of the component manufacturing quality agreement between the joining
organization and the customer.
TJPSs cover a certain range for each essential variable. The range of each essential variable shall
be qualified using a JPQR, and the procedure for measuring each variable shall conform to agreed
specifications.
When completing the TJPS the technical support/manual/documentation of the joining process
equipment manufacturer or service supplier may be consulted.
NOTE 1 Example templates of TJPSs are given in Annex A to Annex K. Worked example TJPSs for hot plate
welding and heat staking: electrical
...