This study presents the development of boron‐doped lignin‐based composites reinforced with textile waste as a sustainable alternative to conventional insulation materials. By utilizing lignin, a byproduct of the paper industry, and textile waste from cotton and polyester blends, composites with varying boron concentrations (0 %, 5 %, and 10 %) were fabricated, evaluated for their thermal, acoustic, and fire‐resistant properties. Among the samples, alb10 (10 % boron addition to pink cotton/polyester waste) exhibited exceptional performance, achieving a burning speed of 20 mm·s −1 , a significant reduction compared to 160 mm·s −1 in the non‐doped alb0 and a thermal conductivity of 0.04 W·mK −1 , comparable to commercial insulation materials. Compared to the reference material yltm (commercial felt), alb10 demonstrated superior fire resistance, enhanced thermal regulation, and improved acoustic insulation, underscoring boron's critical role as a flame‐retardant additive. This work highlights the potential of boron‐doped lignin‐textile composites to address energy efficiency, fire safety, and waste management challenges, aligning with circular economy principles and offering a cost‐effective, eco‐friendly solution for future insulation applications.

One of the main challenges in the automotive industry is the development of lightweight components reducing energy consumption and emissions during production and use. For this purpose, material selection and the production process must be optimized. Lightweight, high‐performance materials such as long fiber thermoplastics (LFT) and lightweight technologies such as foam injection molding (FIM) are therefore ideal for achieving high weight reductions through adapted component designs. With the foam injection molding technology ProFoam, it is possible to achieve longer fibers in the component with long‐fiber thermoplastics and thus the weight‐specific properties can be improved. To analyze the potential of the foam injection molding process for the design freedom of lightweight components, plates with ribs are manufactured using injection molding and foam injection molding with a 10 % weight reduction. The process parameters injection speed, melt and mold temperature and the rib geometries are analyzed in this contribution. During foam injection molding process, it is found that cell formation and fiber length are significantly affected by melt temperature and injection speed, which influence further the mechanical properties

The Mode‐III interlaminar fracture toughness characterization of plain and twill woven carbon‐Kevlar interyarn hybrid textile composites is performed using edge crack torsion test specimens. The fracture toughness is determined using the multi‐specimen‐based compliance calibration method. The edge crack torsion test specimens are characterized for three initial crack lengths, 10 mm, 20 mm, and 30 mm, to determine the compliance calibration coefficients using linear regression analysis. The results revealed that the carbon‐Kevlar interyarn hybridization significantly affects the Mode‐III interlaminar fracture toughness of the edge crack torsion test specimens. The plain woven carbon‐Kevlar interyarn hybrid textile composite laminate with carbon yarn in length direction shows a higher interlaminar fracture toughness than Kevlar monolithic composite laminates. It is also observed that as the initial crack length increases, peak load value decreases, specimen compliance increases, specimen stiffness reduces, and the Mode‐III interlaminar fracture toughness of edge crack torsion test specimens increases. Several failure mechanisms are investigated using scanning electron microscopy of tested samples.

Abstract The main motivation for this research work was the need to find new ways of managing process byproducts of combustion in a way that is safe for the environment and human health. The paper presents research confirming the applicability of the geopolymerization process to stabilize slags and ashes from municipal waste incineration plants. The article aims to assess the possibility of preparing geopolymer materials based on slags and ashes from the process of thermal transformation of municipal waste. The first stage of the work was the characterization of the raw materials used for research using microstructural tests (scanning electron microscopy, x‐ray fluorescence and x‐ray diffraction). The next stage was the synthesis of the geopolymer material based on the above‐mentioned byproducts of the combustion process, including obtaining appropriate samples i. e., beams and cubes. The initial stage of work indicated the need to combine geopolymer materials with the content of slag and fly ash of post‐process origin after the thermal transformation of municipal waste, mixed with another additive to improve the cohesion of the material. For this purpose, another product, which came from thermal transformation processes, was used ‐ fly ash from the coal‐fired power plant. Then, selected physical and mechanical properties of the prepared materials were determined, including: density, compression and bending tests and water absorption. The microstructure of the obtained materials was also characterized. The obtained results were assessed in terms of the possibilities of using new materials in the construction industry.

Abstract This paper deals with ideas for the use of 3D printing in spare parts management in the maritime industry. Although such ideas exist in the literature, there are still many issues that are not adequately addressed and researched. These include areas such as the influence of vibrations and waves on pressure, salt, humidity, etc. A numeric example is presented. Such problems can lead to faulty parts. Also, the speed of 3D printing is not yet acceptable for on‐board applications. The paper presents the methodology for researching this issue. We also point out that all the required properties of filaments must be met in the complex maritime environment and that there is a need for new filaments for these applications.

Abstract The as‐cast copper‐chromium (Cu−Cr) alloy has been manufactured through casting and compared with the cold forged and the heat treated ones. The heat treated forged Cu−Cr sample properties were 105 HV 1 and 257 MPa compared to those obtained in the case of as‐cast pure copper whose properties are 92 HV 1 and 182.88 MPa. Accordingly, the average impact energy value obtained in the case heat treated forged Cu−Cr sample was higher than those obtained in other samples.

Abstract Flux cored arc welding has emerged as a vital welding technology in the realm of pipes and petrochemical pipelines, addressing the severe weld quality, material compatibility, and safety criteria in these essential applications. The paper begins with a brief description of the flux cored arc welding process, explaining its procedural complexities, the necessary tools used, and the variety of consumables used. The review then describes the complexities of flux cored arc welding's applicability in joining pipes due to the unique welding demands imposed by petrochemical pipelines. A thorough examination of flux cored arc welding characteristics and processes follows, identifying the critical welding parameters that have a significant impact on the structural strength and durability of flux cored arc welded joints. The review goes further to highlight key applications of flux cored arc welding through case studies by illustrating the adaptability of the welding procedure to different scenarios. An in‐depth analysis of flux cored arc welding technological advancements that highlights the current developments in electrode composition, shielding gases, and automation is also considered. In conclusion, this study offers a thorough overview of flux cored arc welding uses in pipes and petrochemical pipelines, fusing technical clarification with real‐world applications.