research centers


Search results: Found 3

Listing 1 - 3 of 3
Sort by

Article
HAZ and Melt Limits of 3-D CO2 Laser welding

Authors: A.K. Hamoudi --- W.K. Hamoudi --- S.A. Salih
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2011 Volume: 7 Issue: 2 Pages: 11-17
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

Loading...
Loading...
Abstract

An analytical and numerical 3-D model for keyhole CO2 laser welding of thick C/Mn steel sheets is constructed to study the heat affected zone (HAZ) and melt limits. Simulation results are compared with experimental investigations under variety of laser material processing conditions. The model combines a moving point source for the top part of the weld and a moving line source for the parallel sided region of the weld. The good match of theoretical and experimental results makes the model a good tool to predict the HAZ volume in which microstructure changes may occur. Such prediction is useful in the investigation of hardening and the cracks formation during laser welding.


Article
Modeling of the Preheating Effect on Keyhole Laser Welding Efficiency

Authors: K.S. Khashan --- O.A. Hamadi
Journal: Iraqi Journal of Applied Physics Letters الرسائل العراقية في الفيزياء التطبيقية ISSN: 1999656X Year: 2008 Volume: 1 Issue: 1 Pages: 10-15
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

Loading...
Loading...
Abstract

In this work, results of a mathematical analysis of the role of workpiece preheating in laser keyhole welding were presented. This analysis considered the steady-state welding as well as certain range of boundary conditions over which preheating effect would be indicated. This work is an attempt to interpret the role of preheating to increase welding depth and perform keyhole welding with high quality using physical and thermal properties of steel alloys.


Article
Modeling of 3-D Keyhole CO2 Laser Welding of Steel

Authors: W.K. Hamoudi --- A.K. Hamoudi --- S.A. Salih
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2010 Volume: 6 Issue: 1 Pages: 15-23
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

Loading...
Loading...
Abstract

A mathematical 3-D model for keyhole CO2 laser welding of thick C/Mn steel sheets under variety of laser material processing conditions is presented. The analysis yields profile of the melt pool and compare it with experiments. The model combines a moving point source for the top part of the weld and a moving line source for the parallel sided region of the weld (stem). This concept produces weld profiles that have good qualitative agreement with the experiments. Mathematical model and computer program were constructed to solve two basic heat conduction equations for the moving point and line sources. The excellent match of theoretical and experimental weld profiles will make this work a good candidate for laser welding prediction in robotic networks.

Listing 1 - 3 of 3
Sort by
Narrow your search

Resource type

article (3)


Language

English (3)


Year
From To Submit

2011 (1)

2010 (1)

2008 (1)