The paper presents a hybrid model of an Artificial Neural Network (ANN) and Genetic Algorithm (GA) for modeling of a hybrid laser welding process. This model is employed for the prediction and optimization of penetration depth with corresponding process parameters. A single program developed for the purpose initially establishes an optimized ANN architecture using a Back-Propagation Neural Netw...

This paper reports design details and applications of the developed visual laser radar. It presents experimental results from "inspection of tunnel tubes", modeling of a "car body welding cell" and a "car body gripper" in the automotive industry. The laser radar was developed at Z+F and is designed for high performance measurements with high robustness, suited for deployment in real industrial ...

In hybrid laser–MIG keyhole welding, anti-crack elements can be added into the weld pool through a filler metal in anticipation of compensating mass loss, preventing porosity formation and improving compositional and mechanical properties of the welds. Understanding the mixing and diffusion of the filler metal in the molten pool is vital to achieve these desired objectives. In this study, mathe...

This work studied the effect of additions of carbon dioxide to argon shielding gas on the weld shape and microstructure of ST14 steel in pulsed Nd: YAG laser welding. By additions of carbon dioxide up to 15%,the weld area and depth/width ratio decreases while rising of carbon dioxide up to 25% causes increasing of weld area and depth/width ratio. It is observed that the weld metal microstructur...

Suture repair of a severed peripheral nerve is cumbersome, presents a focus for infection and neuroma formation, and does not always produce adequate stump alignment. An alternative form of repair is laser nerve welding, which is attractive because it does not introduce foreign material into the anastomotic site, it forms a circumferential seal, and it can be performed in difficult-to-reach are...

Introduction In 1916 Albert Einstein postulated the effect of stimulated emission of radiation and thereby laid the theoretical foundations of modern laser technology. However, it was not before 1960 that the first laser, a ruby laser, was built by T.H. Maiman. Today, lasers are widely employed in both civilian and military settings. Examples for civilian applications include CD-players, medica...

A new term “optodynamics” has been introduced to describe a wide range of optically induced dynamic phenomena (Možina & Hrovatin, 1996). A laser pulse is considered not only as a tool in laser material processing but also as a generator of information about the material transformation. The information is retained and conveyed by different kinds of optically induced mechanical waves generated du...

It is a trend to use high-strength steels in the automobile industry because of their good formability, weldability, and high strength–volume ratio. In order to achieve quality control, it is necessary to monitor the welding process online. In this paper, acoustic signals generated during the laser welding process of high-strength steel DP980 were recorded and analysed. A microphone was used to...