PICALO 2008 Paper #304 (Fialure Mechanisms of Laser Welds of Dp980 and Hsla450 Steels in Formability Testing)

Fialure Mechanisms of Laser Welds of Dp980 and Hsla450 Steels in Formability Testing
Authors:
M. Xia, University of Waterloo; Waterloo ON Canada
Norman Zhou, University of Waterloo; Waterloo Canada
Z. Tian, Central Iron & Steel Research Institute; Beijing Peoples Republic of China
Michael Kuntz, University of Waterloo; Waterloo Canada
Presented at PICALO 2008

In this paper, two steels, dual phase (DP) with banded martensite and high strength low alloy (HSLA) with almost isotopic mechanical properties, were investigated with YAG laser welding process in terms of formability with Limited Dome Height (LDH) testing method. The failure mode and dome height a...

PICALO 2008 Paper #303 (Welding Performance of a 2KW Continuous Wave Supermodulated Nd:YAG Laser - Increased Weld Speed, Weld Penetration and Reduced Porosity with Supermodulated Output Power)

Welding Performance of a 2KW Continuous Wave Supermodulated Nd:YAG Laser - Increased Weld Speed, Weld Penetration and Reduced Porosity with Supermodulated Output Power
Authors:
Mohammed Naeem, GSI Group, Inc. - Laser Division; Rugby Great Britain
Richard Jessett, Gsi Group; Rugby Great Britain
John Chinn, Gsi Group; Rugby Peoples Republic of China
Presented at PICALO 2008

The development of disk and fiber laser with a high beam quality in the multikilowatt range has led to new industrial processes and enhancement of the standard processes in terms of processing speeds, welding depth etc. However a laser with high average power and high beam quality is not always the a...

PICALO 2008 Paper #302 (Laser Welding of Niti Shape Memory Alloy)

Laser Welding of Niti Shape Memory Alloy
Authors:
Wang Wei, Beijing Aeronautical Manufacturing Technology Research Institute;Beijing University of Science and Technology;Aviation University of Air Force; Beijing Peoples Republic of China
Li Chen, Beijing Aeronautical Manufacturing Technology Research Institute ; Beijing Peoples Republic of China
Xing-Ke Zhao, University of Science and Technology ; Beijing Peoples Republic of China
Ji-Hua Huang, University of Science and Technology ; Beijing Peoples Republic of China
Presented at PICALO 2008

With high energy YAG Laser beam method, the weld ability of the TiNi shape memory alloy sheet was studied.The mecha...

PICALO 2008 Paper #301 (State of the Art of Laser Welding of Aluminum Alloys in China (Invited Paper))

State of the Art of Laser Welding of Aluminum Alloys in China (Invited Paper)
Authors:
Ronghsi Xiao, Institute of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
Presented at PICALO 2008

Aluminum alloys are among the most important parts of advanced materials being of strategic significance. Laser welding is a fast growing technique that offers new opportunities in the joining of aluminum alloys. Alloys that can be welded, can be welded better using laser radiation. Alloys such as the Al 7000 series that are unweldable with conventional techniques are readily joined by laser welding to produce welds with high strength. In this paper, progresses in laser we...

PICALO 2008 Paper #208 (Mechanism and Experiment of Surface Modification by Means of Laser Cladding Combined with Laser Shot Peening)

Mechanism and Experiment of Surface Modification by Means of Laser Cladding Combined with Laser Shot Peening
Authors:
Suqin Jiang, Jiangsu University; Zhenjiang Peoples Republic of China
Jianzhong Zhou, Jiangsu University ; Zhenjiang Peoples Republic of China
Shu Huang, Jiangsu University ; Zhenjiang Peoples Republic of China
Xia Ji, Jiangsu University ; Zhenjiang Peoples Republic of China
Presented at PICALO 2008

The defects and residual tensile stress in laser cladding layer may cause crack propagation, and will decrease the fatigue resistance of components by laser cladding. Based on analyzing the forming mechanism of the crack and residual tensile stre...

PICALO 2008 Paper #207 (Synthesis and Coating of Aln on Mild Steel by Combined Laser Sol-Gel Technique)

Synthesis and Coating of Aln on Mild Steel by Combined Laser Sol-Gel Technique
Authors:
Marimuthu Sundar, The University of Manchester; Kolkata India
Paul Mativenga, The University of Manchester; Manchester Great Britain
Lin Li, The University of Manchester; Manchester Great Britain
Philip Crouse, The University of Manchester; Manchester Great Britain
Presented at PICALO 2008

In this work a novel method for synthesising AlN coatings is reported. A high-power diode laser at different powers and traverse speeds was applied to a mild steel substrate, coated with a slurry of aluminium hydroxide sol-gel, urea and graphite. The reaction chemical thermodyna...

PICALO 2008 Paper #206 (Numerical and Experimental Investigation of Thermal Stresses and Distortions in the Induction Assisted Laser Cladding)

Numerical and Experimental Investigation of Thermal Stresses and Distortions in the Induction Assisted Laser Cladding
Authors:
Dietrich Lepski, Fraunhofer Institute for Material and Beam Technology Iws; Dresden Germany
Frank Brückner, Fraunhofer IWS Dresden; Dresden Germany
Eckhard Beyer, Fraunhofer Institute for Material and Beam Technology Iws & Lot/Iof Dresden University of Technology; Dresden Germany
Presented at PICALO 2008

In the laser cladding process the powdery coating material is resorbed by the laser induced melt pool and strongly joint to the subjacent substrate. The very high gradients of the laser induced temperature field as well as density changes due ...

PICALO 2008 Paper #205 (Surface Modification of Dental Hard Tissues using Pulsed Uv Lasers (Invited Presentation))

Surface Modification of Dental Hard Tissues using Pulsed Uv Lasers (Invited Presentation)
Authors:
Rui Vilar, Instituto Superior Tecnico; Lisboa Codex Portugal
Victor Oliveira, Instituto Superior Técnico; Lisboa Portugal
Presented at PICALO 2008

In the presentation the surface texture, structural and chemical changes induced in human dental hard tissues (dentin and enamel) by laser processing with KrF excimer laser radiation will be analysed. In dentin, the evolution of surface topography depends on the orientation of the tubules in relation to the incoming laser beam and on the radiation fluence. For fluences larger than 1 J/cm2 the processed surface is flat and covered with a th...

PICALO 2008 Paper #204 (Microstructure and Property of Ni-P-Nano Al2O3 Electroless Plating Layer Produced on Medium Carbon Steel Treated by Laser Technology)

Microstructure and Property of Ni-P-Nano Al2O3 Electroless Plating Layer Produced on Medium Carbon Steel Treated by Laser Technology
Authors:
Fanzhi Kong, Zhejiang University of Technology; Hangzhou Peoples Republic of China
Aihuan Dun, Zhejiang University of Technology; Hangzhou Peoples Republic of China
Jianhua Yao, Zhejiang University of Technology; Hangzhou Peoples Republic of China
Presented at PICALO 2008

Uniform Ni-P-nano Al2O3 eletroless plating layer was produced on medium carbon steel, and scanned by high power continuous waveCWCO2 laser beam. Optical microscope (OM) and scanning electron microscopy (SEM) were used to observe the morphologies of coating...

PICALO 2008 Paper #203 (Laser Producing Ni-Matrix Composite Reinforced by In-Situ Synthesized Particles)

Laser Producing Ni-Matrix Composite Reinforced by In-Situ Synthesized Particles
Authors:
Mingxing Ma, Tsinghua University, Dept of Mechanical Engineering; Beijing Peoples Republic of China
Jiannan Gu, Tsinghua University; Breijing Peoples Republic of China
Minlin Zhong, Tsinghua University; Beijing Peoples Republic of China
Ruiquan Kang, Tsinghua University, Dept of Mechanical Engineering; Beijing Peoples Republic of China
Wenjin Liu, Tsinghua University, Dept of Mechanical Engineering; Beijing Peoples Republic of China
Weiming Zhang , Tsinghua University; Beijing Peoples Republic of China
Hongjun Zhang, Tsinghua University; Beijing Pe...