PURPOSE The present study was intended to evaluate the effect of soldering techniques with infrared ray and gas torch under different gap distances (0.3 mm and 0.5 mm) on the tensile strength and surface porosity formation in Ni-Cr base metal alloy. MATERIALS AND METHODS Thirty five dumbbell shaped Ni-Cr alloy specimens were prepared and assigned to 5 groups according to the soldering method ...

We start this work by revisiting the problem of the soldering of two chiral Schwinger models of opposite chiralities. We verify that, in contrast with what one can conclude from the soldering literature, the usual sum of these models is, in fact, gauge invariant and corresponds to a composite model, where the component models are the vector and axial Schwinger models. As a consequence, we reint...

Introduction Parts of a bridge are related either clinically by the dentist, the direct index, or by the technician in the laboratory, the indirect index, to assemble the parts and invest them for soldering. T o form a direct occlusal index the dentist seats the bridge parts on the teeth and usually either makes a plaster impression record' or uses a self-curing acrylic resin record from which ...

we chose Sn10Bi, Sn10Bi10In, Sn20Bi, and Sn20Bi20In (numbers are in weight percent) rapidly solidified from melt using melt-spinning technique for intermediate –step soldering. We then investigated the structure, electrical and mechanical properties of the melt-spun ribbons using x-ray diffraction, double bridge circuit, dynamic resonance technique, and Vickers microhardeness tester. It was con...

The market for electronic devices such as cellular phones and microcomputers has been rapidly expanding in recent years due to their enhanced performance, downsizing, and cost reduction. This has been realized by innovation in the precision microfabrication technology of semiconductors and printed wiring circuit boards (PWBs) where laser technologies such as lithography, drilling, trimming, wel...

Manufacturing processes, such as cutting, drilling, soldering, marking, forming 3Dsintered parts from metal powders and laser vapor deposition, are now well established practices using matured high power lasers like Nd:YAG, C02 and Excimer lasers(l). These lasers are bulky, inefficient and expensive. Semiconductor diode lasers, if wavelength is not a disadvantage, hold the potential of creating...