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

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.