In an attempt to provide a more flexible means of achieving friction stir welding (FSW) Aluminum without the use expensive FSW machine tool, which are not readily available, this study developed mobile fixture system (MFS) for on Vertical milling Machine Tool (VMMT) and Pillar drilling (PDMT). A conceptual design with moving work table, provides transverse feed (movement) workpieces during FSW,...

The current paper presents a robust optimum design of friction stir welding (FSW) lap joint AA1100 aluminum alloy sheets using Monte Carlo simulation, NSGA-II and neural network. First, to find the relation between the inputs and outputs a perceptron neural network model was obtained. In this way, results of thirty friction stir welding tests are used for training and testing the neural network...

Abstract Double-sided friction stir welding (FSW), performed with a pair of rotation tools, was studied in an attempt to increase the joining speed when applied automotive advanced high-strength steels (AHSS). The experiments were on butt joint 1.6-mm-thick 1180 MPa grade steel sheets, and sound welds obtained travel no more than 4 m/min, fairly comparable laser beam (LBW), one conventional pro...

The permanent metal joining processes play a vital role in assembling the complex aluminium structures of aerospace, automotive, marine, and oil industries. invention friction stir welding (FSW) redefined mechanism to produce high-quality welds by eliminating consumption electrodes shielding gases, resulting economical processes. Research works still lack explore application FSW geometries. In ...

Welding is a suitable and better process to manufacture complex objects for aerospace, naval, automotive structures. Service conditions complexity in load acting force the manufactures make joints between dissimilar materials. Thus, there need efficient welding techniques form sound an understanding of imperfections their effects. In this study attempt has been made joining feasibility aluminum...

In this work, the dissimilar joint of AA7003-T4 and 6060-T4 alloy has been produced by friction stir welding (FSW). The microstructure was examined by optical microscope (OM), electron back scattered diffraction (EBSD), transmission electron microscopy (TEM), and the mechanical properties of the joint were investigated. It is demonstrated that sound dissimilar joint can be produced through FSW....

Different methods have been applied to refine various characteristics of the zone (or nugget) obtained by friction stir welding (FSW). In the current research, joining components are vibrated normal to the weld line during FSW to refine the zone microstructure. This process is described as friction stir vibration welding (FSVW). The effect of FSVW on mechanical properties, corrosion behavior, a...

Random mixing in host populations has been a convenient simplifying assumption in the study of epidemics, but neglects important differences in contact rates within and between population groups. For HIV/AIDS, the assumption of random mixing is inappropriate for epidemics that are concentrated in groups of people at high risk, including female sex workers (FSW) and their male clients (MCF), inj...

OBJECTIVES To determine the relationship of HIV infection in pregnant women to sexual network size and other risk factors. DESIGN Case-control study of women attending the public maternity hospital in Lima, Peru. METHODS We interviewed 75 HIV-seropositive women, 41 of their most recent male partners, and two control groups totaling 137 uninfected pregnant women and 70 of their most recent m...

Results of an exploratory research project elaborating the contexts, patterns and specific scenarios of the commercial sexual activity of northeastern Thai men are reported. Data were collected using face-to-face surveys, focus groups, key informant interviews and observations in 32 northeastern villages (n = 744 men), 18 migrant labour camps housing sugarcane workers (n = 219 men), and five ca...