The Compact Muon Solenoid (CMS) is one of the general-purpose detectors to be provided for the LHC project at CERN. The design field of the CMS superconducting magnet is 4 T, the magnetic length is 12.5 m and the free bore is 6 m. In order to withstand the electro-mechanical forces during the operation of the CMS magnet, the superconducting cable embedded in a 99.998% pure aluminum matrix is re...

In modern design of automobile car bodies reduction in weight and maximization of the structural stiffness and passive safety are the main challenge. The ‘Tailored Blank’ has contributed to achieve a significant weight reduction in recent years. The single flat sheets are joined by Laser Welding in butt configuration without filler wire. Usually the quality of the welds is assured by precise pr...

In this research the quality of the interconnects of the ultrasonically welded Cu terminals to the Cu substrate in the IGBT-module has been investigated. An ultrasonic resonance fatigue system in combination with a laser Doppler vibrometer and a special specimen design was used for shear fatigue testing of these large ultrasonic Cu–Cu welds (about 0.5 cm). Fatigue life curves up to 10 loading c...

Friction stir welding (FSW) is a recently developed solid-state joining process that uses a specially shaped rotating tool to produce lap or butt joints. At the National Research Council, an inter-institute collaboration was started in 2007 with the goal of exploiting the NDE expertise and applying it for the characterization of friction stir welds for various industrial applications. In partic...

This paper presents a fully experimental study on melting, flow and weld strength development during ultrasonic welding of CF/PPS composites with integrated triangular energy directors. The main goal of this research was assessing whether the heating time to achieve maximum weld strength could be significantly reduced as compared to ultrasonic welding with flat energy directors. The main conclu...

Welding high-strength aluminium alloys is generally a delicate operation due to the degradation of mechanical properties in thermally affected zone (TAZ) and presence porosities molten metal. Furthermore, contain compounds that solidify before rest base alloy, therefore acting as stress concentration points lead phenomenon hot cracking. This paper investigates process applying ultrasonic vibrat...

Ultrasonic welding is a high-frequency method of that uses mechanical energy to generate heat. This clean and very suitable for plastic welding. In this study, using the Taguchi experimental method, control factors an ultrasonic machine were optimized affect durability knots trawl nets made from polyamide (PA) polypropylene (PP) filaments as alternative traditional mesh knitting method. After o...

Abstract Ultrasonic welding of plastics has been used in a wide range industries and improving quality production speed are still important issues. This paper introduces method to evaluate the condition during welding. In this method, vibrations propagated were acquired using piezoelectric element. By fast fourier transform analysis, tracking calculation data, total harmonic distortion with tim...