Dissimilar Materials Welding with a Standoff-Free Vaporizing Foil Actuator between TRIP 1180 Steel Sheets and AA5052 Alloy

Abstract

This paper mainly demonstrates an advanced type of the vaporizing foil actuator welding (VFAW) process between GPa-grade steel (TRIP1180) and aluminum alloy (AA5052-H32) without applying standoff. To secure a flying distance during the VFAW process, the preformed target sheet shaped like a circular indentation has been utilized. It is necessary to optimize process parameters integrated with geometrical design of the preform since the welding strength can be decreased beyond the optimum input energy in the standoff-free VFAW process. The welded surface was evaluated by SEM-EDS, XRD, EBDS, and TEM to analyze the welding mechanism and composition at the welding interface. The diffusion zone including the AlFe3 phase was observed at the welded interface which has high grain density due to the high-speed impact by increasing the welding strength, which leads to the perfect welding between the dissimilar materials.

Robot-Assisted Cold and Warm Incremental Sheet Forming of Aluminum Alloy 6061: A Comparative Study

“…Uniaxial tensile tests were performed using a 100 kN INSTRON (MODEL 8801) universal tensile machine on the samples made from undeformed sheets (Table 2) and the cones formed by the CISF and WISF. The samples were prepared as per the ASTM/E8 standard [35]. The samples from the formed cones were cut in three different directions to examine the anisotropic effect on the formed component, namely (a) along the length of the cone wall to evaluate tensile properties in the meridional directional; (b) along the circumferential direction of tool motion to evaluate the tensile properties in the transverse direction; (c) in a direction 45 • to the longitudinal direction along the surface of the cone.…”

Buharlaştırılmış folyo aktüatör kaynağı prototip imalatı

“…Kaynağın oluşması için önemli giriş parametreleri; kaynak metalleri, aktüatör, ayrılma mesafesi, yanal mesafe, verilen gerilim ve giriş enerjisidir. Darbe hızının ve hareketli plakanın çarpma hızının, giriş enerjisinin kontrol edilmesiyle değiştirilebilir olduğu ve bu değişimin kapasitörde depolanan elektrik enerjisi ile sağlanabileceği[4,[20][21][22][23], kaynak malzemelerinin, aktüatör ve mesafelerin optimum değerde olması gerektiği[12,21,24] literatür taramaları neticesinde belirlenmiştir. Belirlenen parametreler, 10,000 µF kapasiteli, 20 nH indüktans, 1,01 kJ maksimum şarj, 450 V maksimum şarj voltajı enerjisine ve 6,55 µ Şekil 1.…”