Transient thermal field in laser surface hardening treatment of medium carbon steel was analyzed by employing both three-dimensional analytical model and finite element model. In finite element model the laser beam was considered as a moving plane heat flux to establish the temperature rise distribution in the work-piece, while in analytical model laser beam was considered as an internal heat s...

Classical ways for coordinate measuring devices are manual theodolites, photogrammetry-based systems, total stations and a recently-introduced device referred to as laser tracker systems. Basically, a laser tracker system is a more accurate and reliable 3D measurement tool that allows to increase and maintain accuracy as time goes by. Laser tracker systems deals with industry-based measuring pr...

Weld pool surface can change dynamically during welding and is indicative of information critical to controlling the process. Research has picked up in the field of observing the weld pool surface to understand the dynamics of the welding process. This paper will help visualize and understand the physics involved in observing the weld pool surface. A study of laser properties, weld pool and cam...

Laser welding of dissimilar aluminium alloys with filler material Luís Filipe Amaro Pinto Instituto Superior Técnico – Technical University of Lisbon – Portugal September 2008 Abstract The aluminium alloys are materials with great potential because of its high strength and low weight. However, the welding of dissimilar aluminium alloys is difficult in autogeneous welding, due to these alloys ar...

Hybrid laser arc welding is a relatively new process, whereby combining the advantages of two different processes, beam and gas metal welding, represents an excellent substitute for conventional but has not yet been sufficiently elaborated researched. Additional research should be carried out in terms hybrid technologies, this leads to creation development standards procedures that would confir...

Abstract. This paper presents the concept of concentric peripheral joint. Designed joint was projected to laser welding process, where using keyhole effect deep penetration trough three materials presented. Concept includes elastic stainless steel material as an connector between two pipes. Stainless in form a ring used additional distance element, joined with Presented investigated numerical s...

The laser-spot welding process of aluminum alloy 1050A with a limited thickness is observed the x-ray phase contrast method to investigate melt dynamic especially when penetrates material. investigated two different wavelengths laser beam source: 515 and 1030 nm influence absorptivity. progressively material during spot-welding until reaching bottom side lower material, so-called “lens-like” ap...

This thesis presents a collection of theoretical and experimental investigations into various geometrical aspects of hybrid laser-MIG welding. The work is divided up into four parts; 1. A review of the hybrid laser-MIG welding technique with brief summaries of the three papers which make up the remainder of the thesis. 2. A paper entitled “Fundamental analysis of hybrid laser-MIG welding”. This...