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 #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 #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 #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 #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 #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 #305 (Laser Welding of Aeronautic Titanium Alloys (Invited Paper))

Laser Welding of Aeronautic Titanium Alloys (Invited Paper)
Authors:
Shui-li Gong, BAMTRI; Beijing Peoples Republic of China
Wang Hong, BAMTRI; Beijing Peoples Republic of China
Li Chen, Bamtri; Beijing Peoples Republic of China
Wei Yao, Bamtri; Beijing Peoples Republic of China
Presented at PICALO 2008

Titanium alloy is one of the most important materials and finds extensive applications in aerospace industry arising out of advantageous combination of low density, high strength and excellent corrosion. Driven by cost and weight savings, technological progress is moving in the direction of replacing rivets and fasteners with welds. Laser welding with high...

PICALO 2008 Paper #306 (Laser Welding of Ultra High Strength Steels for Automotive Applications)

Laser Welding of Ultra High Strength Steels for Automotive Applications
Authors:
Steve Shi, TWI Ltd; Cambridge Great Britain
Steve Westgate, TWI Ltd; Cambridge Great Britain
Presented at PICALO 2008

The increasing demand for improved fuel efficiency and reduced emissions has prompted the automotive industry to seek methods of reducing vehicle body weight by using materials with good strength to weight ratio, such as ultra-high strength (UHS) steels. Consequently, these steels have been the fastest growing weight reducing materials to be used in vehicle structures in the last decade, despite competition from aluminium alloys and composite materials. Laser welding of UHS steels, eith...

PICALO 2008 Paper #307 (Humping Mechanisms during High-Speed Welding with Brilliant Lasers)

Humping Mechanisms during High-Speed Welding with Brilliant Lasers
Authors:
Axel Hess, FGSW Forschungsgesellschaft für Strahlwerkzeuge GmbH; Stuttgart Germany
Friedrich Dausinger, FGSW Forschungsgesellschaft für Strahlwerkzeuge GmbH; Stuttgart Germany
Presented at PICALO 2008

Further developments in laser beam sources as fiber and thin disk lasers allow deep penetration welding with unrivalled welding speeds because of their high brilliance. Thereby imperfections in the welding seam may occur - particularly humping as well as spatters. Visual and infrared high-speed videos show the location and the formation of the humps. The humping phenomenon during the high speed welding proc...

PICALO 2008 Paper #401 (Advancement in Laser Drilling for Aerospace Gas Turbines)

Advancement in Laser Drilling for Aerospace Gas Turbines
Authors:
Mohammed Naeem, GSI Group, Inc. - Laser Division; Rugby Great Britain
John Chinn, Gsi Group; Rugby Great Britain
Presented at PICALO 2008

Aerospace gas turbines require a large number of small diameter holes (<1mm) to provide cooling in the turbine blades, nozzle guide vanes, combustion chambers and afterburner. Many thousands of holes are introduced in the surface of these components to allow a film of cooling air to flow over the component. Film cooling both extends the life of the component and enables extra performance to be achieved from the engine. A typical modern engine will have ~ 100,000 such holes. Drillin...