Events

Seminar on Advanced Laser Based Joining Technologies and their Diverse Applications

Date: 15 Jul 2010 - 15 Jul 2010

Venue: SIMTech Auditorium, Tower Block, Level 3

Introduction

Compared to joining technologies using other conventional heat sources, laser-based joining is characterised by high processing speed, high precision, low heat input, refined weld microstructure, small volumes of weld zone and HAZ, low thermal stress and low distortion. This process enables laser to join materials that other conventional processes fail. With the rapid advance in laser technology, laser beam has become increasingly popular in joining of materials and has found wide applications in manufacturing industry, such as automotive, aerospace, MedTech, oil & gas and marine industry. Addressing the needs of the industry, this seminar will provide an opportunity for the local researchers and industry to share with the invited speaker from Germany on the advancement in laser-based joining technologies, including Laser Additive Manufacturing and Laser Beam Welding.

Programme
9:00 am  Registration 
9:25 am  Welcome Address by Dr Wei Jun, Group Manager, Joining Technology, SIMTech
9:30 am  Laser Additive Manufacturing –A Key Enabler for Future  Factories? by Dr Andres Gasser, Fraunhofer Institute  for Laser 
               Technology, Germany
10:15am Q&A
10:30am Refreshment and Networking               
11:00am  Laser Beam Welding – Materials, Processes, and Applications by Dr Andres Gasser, Fraunhofer Institute  for Laser Technology,
                Germany
11:45 am Q&A
12:00 pm End of the event

Abstracts
Laser Additive Manufacturing –A Key Enabler for Future Factories
Laser Metal Deposition LMD and Selective Laser Melting SLM are near-net-shape additive processes using serial powder materials. The common feature of all additive manufacturing processes is the provision of the geometrical data for the fabrication of the parts. Therefore, the starting point is a 3-dimensional CAD model which is subdivided into layers of a defined thickness. The actual part is fabricated by repeating a process of applying new material layers and transferring the geometrical information of each layer into the material using a laser beam. The most important difference between LMD and SLM is the provision of the powder material. For LMD the powder material is locally supplied by a powder feeding nozzle (coaxial or off-axial), while for SLM the part is fabricated in a “powder bed”. In both processes, the powder is completely melted by the laser beam resulting in fully dense layers without post processing (e. g. infiltration for Selective Laser Sintering). This enables mechanical properties which are equal or even better to those of rolled metal sheet. The precision and geometrical freedom of SLM is higher in comparison to LMD, while the possibility to build-up material layers directly on 3D-surfaces and the processability of very large parts are the main advantages of LMD and enable the use of LMD for repair and wear/corrosion protection applications. In his presentation, Dr Gasser will give an overview of the LMD and SLM technology as well as its applications.

Laser Beam Welding – Materials, Processes, and Applications
Laser beam welding can be used as joining technology for a wide variety of materials at part dimensions ranging from a few micrometers to centimeters in thickness. The weldability of a part is defined by the welding suitability of the material, the welding reliability defined by design, and the welding capability of the processes. As 80% of the welding suitability is defined by materials to be welded, essential part of welding science is material sciences. In the case of laser beam welding, the focus lies on short-term metallurgical processes. Weld and HAZ microstructures originate from non-equilibrium phase transformations resulting in different properties as obtained by arc welding. Laser welding processes are characterised by a deep penetration welding effect. This requires a good edge preparation, heat distribution and input result with less distortion and reduced post processing effort. New designs are possible.
The presentation starts with the welding process development using the example high-strength titanium alloy. Some examples demonstrating the processes involving laser beam welding and the bandwidth of the technology will be presented.
    
About Dr Andres Gasser
Dr Andres Gasser is a Senior Scientist at Fraunhofer-Institut für Lasertechnik-ILT, Aachen, Germany. He studied Applied Physics at the Technical University of Darmstadt, Germany, where he received his diploma degree in 1985. Since then, he has been working in the field of surface treatment at Fraunhofer-ILT. He received his PhD Degree in Mechanical Engineering in 1993. He has led many national and international projects in the field of optics, process development and system engineering and has implemented several Laser Metal Deposition systems at companies like Procter&Gamble, Stork Gears & Services and Rolls-Royce Germany. Dr  Gasser is the leader of the LMD group at ILT. He holds more than ten patents in laser material processing.  

Registration
This is a non-chargeable seminar and registration is on first-come-first-serve basis.
Please register onling

Enquiries
Technical enquiries : Dr Bi Guijun, Tel : 6793 8502, Email : gjbi@SIMTech.a-star.edu.sg
General enquiries : Ms Samantha Sukiyama Chan, Tel : 6793 8423, Email : chanskf@SCEI.a-star.edu.sg