Abstract
In the production of metal-polymer multilayer composite parts, e.g., for automotive applications, the possibilities of thermal joining are limited due to the instability of the polymer core at elevated temperatures. Accordingly, such materials require a special approach to their welding. The three-layered metal-polymer-metal samples were made of DPK 30/50+ZE dual-phase steel as cover sheets that were electrolytic galvanized, and a polypropylene-polyethylene foil as core material, with thicknesses of 0.48/0.3/0.48 mm. The samples were welded on both sides using a 1.06 µm Nd:YAG ROFIN StarWeld Manual Performance laser. Significant improvements of the welding conditions are achieved by machining the edges of materials to be welded. The parameters of laser welding were chosen in such a way that the polymer structure remained almost unchanged. The weld thickness was about 40% of the thickness of each steel layer. It was established that within the selected laser processing parameters the melting occurred uniformly, while the polymer layer practically did not change its structure. Therefore, it can be stated that two-sided joint welding of metal-polymer-metal composite sandwich panels, without significant degradation of the polymer core layer, is feasible.
Highlights
Sandwich panels are promising composite materials, which combine advantages of the used mono-materials
The parameters of laser welding were chosen in such a way that the polymer structure remained almost unchanged
It can be stated that two-sided joint welding of metal-polymer-metal composite sandwich panels, without significant degradation of the polymer core layer, is feasible
Summary
Sandwich panels are promising composite materials, which combine advantages of the used mono-materials. Considering the results of these studies, it was reported in [20] that the laser welding used to join metallic materials cannot be applied to sandwich materials without degradation of the central polymer layer. The appropriate regimes for laser welding of steels a combination of such welded joints largely determined by the accuracy the assembly of theand elements to be parameters as is qualitative weld formation, sufficientof operating strength, acceptable welded This type of assembly must ensure the possibility for tight fitting of the edges mechanical properties of the welded joint. Metal-polymer-metal sandwich composites without significant degradation of the polyThe purpose of this study is to investigate the possibility of the laser welding of metalmer core layer. The traverse speed of the laser spot was Figure shows the top view of the welded joint of the upper metallic layer.
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