Solid State Phenomena Vol. 216

Abstract: The objective of this study is to present the feasibility of welding of AA2124/SiC/25p-T4 metal matrix composite at high welding speed by friction stir welding. We carried out the analysis of the microstructure, microhardness, and tensile test of welded sample from different areas, to evaluate the performance of the weld. The phase structure of AA2124/SiC/25p-T4 metal matrix composite was determined by X-ray diffraction (XRD). The temperature monitoring and measurements in the welding zone, in different areas was made, using infrared thermography to demonstrate that the FSW welds of AA2124/SiC/25p-T4 is below the melting temperature of the base material and to see the temperature distribution during the process. In addition, the monitoring and the control of energy consumption was achieved.

Abstract: so-called llightweights materials (aluminum, magnesium, titanium) and their alloys due to multiple applications in various leading industries (aeronautics, automotive, electrical) always stayed in researchers attention both in order to improve their mechanical characteristics and to optimize technologies for cutting processing them. This paper is part of these concerns by trying to find answers to some questions about high-speed drilling of electrolytic aluminum parts and has as targets of the investigation the following: the material machinability, the working parameters optimization, the tool used in drilling and the quality obtained after machining.

Abstract: The aim of the research is to highlight the properties of the welded joints of the steels that are used for mains X60 and X70. X60 and X70 steels were welded by automatic welding procedure (STT) at the root and also by automatic MIG procedure for the filling layers. Thereby an increase between 6 15 [%] of the weld bead hardness was obtained in the case of the X 60 steel welding. An increase of bead fracture strength was also noticed from 570 [N/mm²] X 60 steel to 646 [N/mm²] X70 steel.

Abstract: This investigation concerns the influence of key parameters of laser welding on the geometry and microstructural properties of the weld bead. The study is intended to restrain the interval field of the welding parameters and to investigate the welded joints achieved through this technique. A 3,3 kW Nd:YAG laser together with a Rofin welding head and an ABB 6-axes robot were used for this investigation. The tests highlight the major influence of the laser spot diameter on the geometry of weld bead. The experiments were made on various samples of AISI 304 thin sheets. In depth characterization of the weld area was conducted by means of optic and electronic microscopy and EDS analyses.

Abstract: the paper proposes an axiomatic design view of orientation schemes used in fixture design, in context of using the axiomatic design rules and guidance to fixture design. In this paper the axiomatic design, matrix and rules are applied to orientation schemes in order to see what kind of designs result (uncoupled, decoupled) and how can be applied the information axiom to choose among the orientation schemes that one (s) that are best suited for the declared purposes-minimum orientation errors.

Abstract: This study focuses on the analysis of the electric field voltage influence on the microhardness of the layers coated by thermal spraying. Based on the fact that the loads that are oppositely signed are attracted, an electric device of electric field generating in alternating current is developed, the electric field being generated between the metalizing gun and the work piece. Any metallic body that crosses the electric field is loaded with electric loads, which are yielded by an electric discharge when meeting the oppositely signed load. Thus, the physical and chemical properties of the layers coated by thermal spraying are improved by enhancing the powders displacement speed and by the appearance of micro weldings at the impact between the powder and the metalizing piece. After the samples analysis, an improvement of the diffusion zone is noticed and also an increasing of the microhardness for the samples at which the following voltages are used U = 30; 50; 70 [. In order to achieve the experimental samples, the CastoDyn DS8000 thermal spraying unit, the standard metallization module SSM 10 and the nickel based powder ProXon 21021 were used.

Abstract: Processing by injection is the technological process by that the thermoplastics material is injected, under pressure, in the cavity of a mould, where it cools down and solidifies. This process is the most common method for obtaining plastic materials. Injection moulding of thermoplastics has emerged as the premier vehicle for delivering high quality, value added commercial products. Continued global competitiveness has increased standards for product capability and quality while requiring reduced product development time and unit cost. Despite advanced design methods and new process technologies, it is becoming apparent that the injection moulding process is neither flexible nor robust. This paper presents a design process using CAD-CAM software applied to an injection mould for manufacturing a plastic component that is used in the automotive industry. The component was analyzed, measured and subjected to simulations that will certify the quality of the final product.