International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

This paper deals with the study and evaluation of the utility properties of selected types of polymer powder coating systems applied to S235JR structural steel. The primary objective was to assess the influence of the coating system composition (combination of primer and topcoat versus individual layers) on its mechanical properties and corrosion resistance. The experimental part included surface preparation by blasting, electro kinetic application of four types of coating systems (Corro zinc 97, Corro coat MX, and Corro coat PE-F), followed by testing of roughness, thickness, adhesion, and bending resistance. Corrosion resistance was evaluated in a condensation chamber. The measurement results confirmed that the plasticity, measured by the bending angle, decreases with increasing coating thickness. The highest adhesion was exhibited by the combined coating system Corro zinc 97 + Corro coat MX. Corrosion tests demonstrated the crucial importance of the zinc-rich primer, which significantly slowed down the spread of sub-corrosion at the site of mechanical damage

This article presents a study of the possibility of creating adhesive-mechanical bonds between aluminum and a thermoplastic matrix composite. In detail, the influence of drilling process parameters on the shape of the bushing and the formation of joints with fiber-reinforced composites during direct drilling using various tool speeds and feeds is examined. Finally, the load-bearing capacity of the formed joints is presented.

The paper presents an innovative method for joining Al alloy sheets and polymer fibre-reinforced composites by thermal drilling. A proposal for modifying the joint geometry by reverse drilling with a larger diameter tool is presented. The proposed modification demonstrated a statistically significant increase in the failure energy of the resulting joints.

This paper deals with the change of joint geometry of non-ferrous metal sheets and composite plates reinforced with bi-directional glass and carbon fiber by thermal drilling due to the effect of different drilling strategy. Joints formed by direct and sequential drilling were tested. Sequential drilling represents a convenient way to minimize delamination of layered composites during joining.

The paper deals with application of organosilicate sol-gel to improve the adhesion of overlapped joints of metallic non-ferrous alloy thin sheets and continuous fibre reinforced composites by heat and pressure. The organosilicate layer showed a significant increase in adhesion of EN AW 6082 T6 and AZ91 alloys to glass fibre reinforced polypropylene matrix composite.

This paper presents the results of scanning fiber continuity in the joints of thin sheets made of aluminum and magnesium alloys with bi-directionally glass and carbon fiber-reinforced composites formed by thermal drilling technology using computed tomography. The scans show the progression of the bushing forming and the closure of the fibres in the hem joint. Little delamination, but no fiber fracture are visible in metal-composite joints.

The paper discusses the possibilities of joining thin-walled metals and composites reinforced with bidirectional carbon/glass fibres. The experimental part of the paper contains metallographic sections and results of load-bearing capacity testing of pilot metalcomposite joints with thermoplastic matrix and glass and carbon fiber reinforcement, formed by thermal drilling technology. As a result, a sequential joining method is proposed which can achieve the optimum joint geometry with a hem to keep the joint from opening under tensile stress.

The contribution is focused on the analysis of the surface roughness after applying the conversion layer using phosphating. In the experiment, uncoated deep-drawn steel DC 04 was used as the base material. During the application of the conversion layer, changes in surface roughness were studied with respect to the phosphating time, which was 3, 5 and 10 minutes. The achieved results provide information for other technological operations such as creating joints by gluing, where the correct anchoring of the glue is important for sufficient adhesion to the surface.

The article deals with determinatin the optimum parameters for thermal drilling of selected Al, Mg and steel alloys to be subsequently used for joining with thermoplastic matrix composites reinforced with bidirectional continuous fibers. The optimum thermal drilling parameters will be considered to be those which produce a bushing of sufficient length and thickness to penetrate the composite material to a thickness of 1.5 mm.

In the contribution, the surface quality of the steel substrate is analyzed from the point of view of its microgeometry as a set of quantities capturing the differences of individual surface changes. The subject of investigation are the surfaces of steel substrates, i.e. the base material, degreased surface, standard galvanized surface, surface after galvanizing and subsequent chromating, surface after phosphating and surface after phosphating and application of RAL coating.

The paper focuses on the evaluation of the quality of joints of thin-walled dissimilar overlapped materials, formed by thermal drilling without a screw. The shaped interference fit joint is formed by simultaneously forming both overlapped materials, preheated by the friction of a flowdrill tool, and forming a pair of embedded concentric bushings. The joints were made on a CNC milling centre, at constant speed, with tool feed being the only variable. Three tool movement strategies – three movement schemes – were tested. By evaluating the quality of the joints using metallographic sections, the optimum tool movement strategy was selected.

This paper presents an overview of technologies for joining fibre-reinforced polymer composites to thin-walled metal sheets. It covers the areas of welding, bonding with different surface texturing as well as mechanical joining. It analyses the problems arising from the different mechanical, physical properties of metals and composite materials and presents the possibilities of solving them by the application of individual and combined joining technologies.