An attempt made to optimize the operating parameters involved in an autogenous pulsed Nd: YAG laser welding process of similar and dissimilar combinations of butt joint of 2 mm thick 316 L stainless steel and mild steel. Influence of prominent laser welding parameters such as average peak power, defocus position, spot position, and shielding gas were investigated for welded joints considered. T...

Laser technologies are widely used in various areas of contemporary practice not only in engineering but also in medicine. Owing to them, more accurate and precise results are achieved in making objects of unique shape and size for various purposes. In recent years, these technologies have entered rapidly into dental prosthetics. Several processes are mainly used: laser cutting, laser welding, ...

Laser assisted skin wound closure offers many distinct advantages over conventional closure techniques. The objective of this in vitro experimental study, carried out at the Institute of Laser for Postgraduate Studies/Baghdad University, was to determine the effectiveness of 980 nm diode laser in welding of human skin wounds. Multiple 3-4 cm long full thickness incisions in a specimen of human ...

The aim of this study was to analyze the shear bond strength between commercially pure titanium, with and without laser welding, after airbone-particle abrasion (Al(2)O(3)) and 2 indirect composites. Sixty-four specimens were cast and divided into 2 groups with and without laser welding. Each group was divided in 4 subgroups, related to Al(2)O(3) grain size: A - 250 microm; B - 180 microm; C- 1...

LASER in the otology field was used to perform tympanotomy and for the placement of ventilation tubes, vaporization of horny pearls and adhesion in the eardrum, remobilisations and ossicular modelings, “spot-welding”; in this field the most argued area of applicability of LASER is the surgery of the otosclerosis. The otosclerosis treatment with surgical LASER started with Perkins and Di Bartolo...

A robust and non-intrusive focus control system for laser welding has been developed under a collaboration between GSI Lumonics (Rugby) and Heriot-Watt University in Edinburgh, as part of the Laser Engineering for Manufacturing Applications Programme (LEMA), funded by EPSRC. It uses the light generated by the process, together with the chromatic aberrations of the focusing optics to determine t...

UNLABELLED Titanium reacts strongly with elements, mainly oxygen at high temperature. The high temperature of titanium laser welding modifies the surface, and may interfere on the metal-ceramic tensile bond strength. OBJECTIVE The influence of laser welding on the titanium-ceramic bonding has not yet been established. The purpose of this in vitro study was to analyze the influence of laser we...

Background and aim: The scars of the cutaneous leishmaniasis and psychologic problems of this disease needs different intervention for its correction. Our objective in this study was to compare the efficacy of trichloroacetic acid (TCA) 50 percent solution and CO2 laser for treatment of the atrophic scars due to leishmaniasis. Materials and methods: This was a randomized clinical trial perfomed...

A three-dimensional (3D) finite element (FE) model is applied to predict the temperature evolution in the laser welding of galvanized high-strength steels in a zero-gap lap joint configuration. A rotary Gaussian volumetric heat source model is introduced to simulate the laser energy input. The temperature data measured by thermocouples are used to verify the boundary conditions of the thermal m...

Using tensile tests, this study investigated differences in the welding strength of casts of cobalt-chromium and gold alloys resulting from changes in the voltage and pulse duration in order to clarify the optimum conditions of laser irradiation for achieving favorable welding strength. Laser irradiation was performed at voltages of 150 V and 170 V with pulse durations of 4, 8, and 12 ms. For c...