4. Conclusion

For all those involved in the welded assembly of thermoplastics, application of the standards brings the following benefits:

• it justifies the very existence or subsistence of the company: without the application of standards, there would be no market, no customers... for regulated markets;

• it helps with calculations, dimensioning and the state of the art in the field of application;

• a competitive advantage;

• it guarantees the process and quality control;

• it enables staff to be monitored and qualified.

If certification and qualifications are difficult to absorb financially, they are not necessarily a goal in themselves, but a guide, as well as a way of thinking and a rigorous...