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

Laser welding has become a highly effective technique for joining of metal sheets, offering precision and minimal thermal distortion. The quality of the welds, however, is significantly influenced by the proper selection and control of process parameters. This study focuses on the optimization of key parameters like laser power, welding speed, wire feed rate, and beam oscillation through experimental welding trials.
The practical part of the research involved welding thin sheets with LW-2000W device at various parameter settings, followed by visual inspection and metallographic analysis of the final welds. The findings provide insights into how parameter optimization can enhance consistency and overall process reliability, offering valuable guidelines for industrial applications where high precision is required.

Article presents the results of research aimed at determining the quality of the weld layers produced during the renovation of the surfaces of molds intended for injection molding of aluminum alloys. Plasma arc transfer (PTA) technology was used. Medium alloy steel X38CrMoV5-1 (H11) was used as the mold material. Three types of additives in powder form were used to create functional layers: two iron-based types with the designation HSS 23 and HSS 30 and one nickel-based type with the designation DEW Nibasit 625-P. The quality of the layers was assessed using non-destructive and destructive tests. The surface integrity of the layers was assessed using visual and capillary tests. Chemical composition of the elements was determined by energy-dispersive X-ray spectroscopy (EDX) analysis using a SEM microscope and the hardness of individual layers was evaluated also. Since molds are subject to significant frictional wear during operation, friction coefficients

The main objective of this paper is to get an accurate result of the mechanical characteristics of welded joints of structural steel performed with two different types of filler material, wire, which are characterized by: simple welding technology, low structural changes of the basic materials, as well as lower cost of welds. The whole research is conducted in accordance with European standards for welding. Research has been conducted on two standard plates made of constructive steel S355J2 + N Z15, with a thickness of 15mm, according to standard EN ISO 15614-1. Both plates are welded with solid wire and metal cored wire under the protection of a gas mixture based on argon, and the whole process is supported by standard documentation. Destructive tests have been performed to determine the welded joints’ quality and influence of different filler materials, such as tensile test, impact test, and hardness test in the weld and heat-affected zone. The experimental results confirm that the gas metal arc welding of structural steel in the protection of inert gas with solid and metal cored wire is a procedure that ensures the quality and safety of welded joints and retention properties of the base material after the welding process.