Abstract
The temperature- and time-dependent penetration of surface structures is examined in thermal joining between polypropylene and aluminum. Experimental and numerical investigations were carried out for spot joints in order to describe the main effects on structure penetration. Further investigations were performed in a half-section setup to gain information directly from the joining zone. The thermal expansion of the thermoplastic material as well as the temperature distribution in the melting layer were identified as key parameters for structure filling on the metal surface.
Highlights
Introduction and State of the ArtThe use of hybrid metal-plastic components gains importance in several fields of application, e. g. for lightweight design in automotive industry or functionalization in domestic appliance technology
Thereby, joining technology is a key parameter for realizing hybrid structures wherefore several processes are described within the state of the art, e. g. mechanical fasting, adhesive bonding or thermal joining
In the state of the art, several investigations were carried out on this process and especially the form fit between thermoplastic material and metal sheet was identified as key parameter to achieve a high joint strength
Summary
The use of hybrid metal-plastic components gains importance in several fields of application, e. g. for lightweight design in automotive industry or functionalization in domestic appliance technology. The polymer is molten due to the heat transfer between both materials, penetrates the surface of the metal joining partner and wets it. In the state of the art, several investigations were carried out on this process and especially the form fit between thermoplastic material and metal sheet was identified as key parameter to achieve a high joint strength. A sufficient wetting time of several seconds was mentioned in investigations of [7] in order to form well bonded metal-plastic joints. This article focuses on the interaction between temperature distribution, different joining times and material properties on surface penetration in thermal joining.
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