Article | REF: BM7775 V1

Welding thermoplastics

Author: Gérard JOLY

Publication date: January 10, 2005

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1. Welding basics

1.1 Interface phenomena. Elements of physics

Welding is a technique for joining materials by fusion, involving a process of adhesion by molecular interdiffusion.

According to theory, the process of welding two polymers can be broken down into five stages:

  • fusion of surfaces to be welded ;

  • approaching and contacting the two surfaces ;

  • surface "wetting";

  • macromolecule diffusion and entanglement ;

  • solidification of melts.

On contact with the heating element, the material is brought into a "softened" state.

The appearance of...

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