The aim of this study is to evaluate the microstructures, tensile lap shear strength, and fatigue resistance of 6022-T43 aluminum alloy joints welded via a solid-state welding technique-ultrasonic spot welding (USW)-at different energy levels. An ultra-fine necklace-like equiaxed grain structure is observed along the weld line due to the occurrence of dynamic crystallization, with smaller grain...

Various joining methods are available for composite structures, with anticipated benefits for the most obvious way of exploiting the nature of thermoplastic materials: melting and reconsolidation. A proper joint selection and detailed design, however, will require quantitative results obtained in an objective and reproducible procedure. The objective of this paper was to develop benchmark proce...

Aim of study: To evaluate the influence parameters geostatistical model and initial sample configuration used in optimization process; to propose resizing a configuration, reducing its size, for simulated data study spatial variability soil chemical attributes under non-stationary with drift process from commercial soybean cultivation area.Area Cascavel, BrazilMaterial methods: For both, attrib...

The Spot welding is widely used for joining thin sheets in different industries; such as automotive industry. This method of welding is very easy to automate and maintain. In this study, the effect of nugget diameter on the tensile-shear strength of the spot welding joints was investigated. The specimens were manufactured from AISI 1008 HR sheets with 1.0 mm thickness. The eight different elect...

Daging ayam merupakan salah satu hasil ternak yang harganya relatif terjangkau dan memiliki kandungan gizi bagus. dapat diolah menjadi aneka olahan, seperti sosis, nugget, bakso. Nugget adalah produk dengan bahan baku daging ayam. Produk ini berupa resctructed meat macam-macam sesuai keinginan, dipadu sedikit tepung kemudian diselimuti panir, sehingga rasanya sangat diminati oleh semua kalangan...

For many expensive deterministic computer simulators, the outputs do not have replication error and the desired metamodel (or statistical emulator) is an interpolator of the observed data. Realizations of Gaussian spatial processes (GP) are commonly used to model such simulator outputs. Fitting a GP model to n data points requires the computation of the inverse and determinant of n × n correlat...

An incrementally coupled electrical – thermal – mechanical model is developed to simulate small scale resistance spot welding (SSRSW) using the finite element method. This numerical model is then employed to study the differences between SSRSW and ‘large scale’ resistance spot welding (LSRSW). The variations in contact area, current distribution, and temperature profile at the workpiece/workpie...

A Robotic System is being developed to automate the crucible packing process in CZ semiconductor wafer production. It requires the delicate manipulation and packing of highly irregular polycrystalline silicon nuggets, into a fragile fused silica crucible. For this application, a dual optical 3-D surface geometry measuring system that uses active laser triangulation has been developed and succes...