Volkswagen ID.4: Bonding log

Introduction

The requirements for the processes of joining or bonding vary depending on the component. These include, for example, the preparation of a bonding log.

This is necessary as a proof of the reliability of the bonding process.

Important

• A bonding log must be prepared if specified accordingly in the respective repair description.
• In the bonding log, the bonding process as well as the materials used and the corresponding working sample must be fully documented in accordance with the respective repair description.

Working sample

Important

• Ensures and proves that bonding has been carried out correctly.
• The result of the working sample must be documented in the bonding log.
• To create a working sample, apply a bead of adhesive of approx. 10 cm in length to a solid substrate, and evaluate it once the specified minimum drying time has elapsed.
• For evaluation, cut the working sample with a commercially available cutter in several locations, and assess the hardening effect by examining the cut surface.

Exams on working sample with 1-component adhesive bead:

• The adhesive must have a firm skin and may not pull threads when touched.
• No liquidity must be evident inside the adhesive bead after the minimum drying time.

Exams on working sample with 2-component adhesive bead:

• The adhesive must be fully hardened.
• No liquidity must be evident inside the adhesive bead.

If the result of the working sample is negative (hardening not complete), process-safe bonding is not ensured. If this is the case, measures need to be taken to ensure proper hardening, which involves consulting the bonding supervisor (four-eyes principle) and, if necessary, repeating the bonding process.

Installation instructions for bonded windowsSelf-adhesive components