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Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):

G. Liedl et al.:
"Laser Assisted Joining of Dissimilar Materials";
Vortrag: IQCMEA-ICF - Processing, Performance and Failure Analysis of Engineering Materials, Luxor, Egypt; 14.11.2011 - 17.11.2011; in: "Proceedings IQCMEA-ICF - Processing, Performance and Failure Analysis of Engineering Materials", A. El-Batahgy, M. Waly (Hrg.); (2011), S. 22 - 31.



Kurzfassung deutsch:
Joining of dissimilar materials is often challenging due to different material properties. Laser welding is an attractive technique compared to conventional joining techniques of dissimilar
metals since processing speed and precision are high whereas heat input is very low. Laser assisted joining of dissimilar materials, like aluminum alloys - steel, aluminum alloys - titanium and hard metals - steel has been examined with high power Nd:YAG and diode
lasers. Joining of aluminum alloys from 5XXX and 6XXX groups (AlMg3 and AlMgSi1) and titanium or micro alloyed steel H340 (galvanized and non-galvanized) have been investigated. Additionally, butt joints between hard metals K40 (86% tungsten carbide, 12 % cobalt and
2% titanium and tantalum carbide) and carbon steel C75 (tensile strength 1450 N/mm2) have been examined. A 1 kW diode laser as well as 3 kW Nd:YAG laser have been used for experiments. Microstructure and mechanical properties of laser welded samples have been
investigated by microscopy, SEM and micro hardness analysis. Aluminum - steel samples have been tested by shear strength measurements, too. All aluminum samples have been welded in an overlap configuration. Additionally, aluminum - steel and hard metal - steel samples have been welded in a butt joint configuration. Mismatch of thermo-mechanical properties, like thermal expansion coefficient or thermal conductivities of materials selected for welding and the formation of brittle intermetallic phases result in residual stress formation.
Line energy, focal position, shielding gas and laser pre- and post-heating have been varied. A precise temperature control with pre-heat and post-heat treatment has been used to minimize
stress and possible weld defects. Results indicate that laser welding produces competitive joints without cracks or pores in the weld seam between dissimilar metals.

Kurzfassung englisch:
Joining of dissimilar materials is often challenging due to different material properties. Laser welding is an attractive technique compared to conventional joining techniques of dissimilar
metals since processing speed and precision are high whereas heat input is very low. Laser assisted joining of dissimilar materials, like aluminum alloys - steel, aluminum alloys - titanium and hard metals - steel has been examined with high power Nd:YAG and diode
lasers. Joining of aluminum alloys from 5XXX and 6XXX groups (AlMg3 and AlMgSi1) and titanium or micro alloyed steel H340 (galvanized and non-galvanized) have been investigated. Additionally, butt joints between hard metals K40 (86% tungsten carbide, 12 % cobalt and
2% titanium and tantalum carbide) and carbon steel C75 (tensile strength 1450 N/mm2) have been examined. A 1 kW diode laser as well as 3 kW Nd:YAG laser have been used for experiments. Microstructure and mechanical properties of laser welded samples have been
investigated by microscopy, SEM and micro hardness analysis. Aluminum - steel samples have been tested by shear strength measurements, too. All aluminum samples have been welded in an overlap configuration. Additionally, aluminum - steel and hard metal - steel samples have been welded in a butt joint configuration. Mismatch of thermo-mechanical properties, like thermal expansion coefficient or thermal conductivities of materials selected for welding and the formation of brittle intermetallic phases result in residual stress formation.
Line energy, focal position, shielding gas and laser pre- and post-heating have been varied. A precise temperature control with pre-heat and post-heat treatment has been used to minimize
stress and possible weld defects. Results indicate that laser welding produces competitive joints without cracks or pores in the weld seam between dissimilar metals.

Schlagworte:
Laser Welding, IMP, Aluminum, Titanium, Hard Metal.


Elektronische Version der Publikation:
http://publik.tuwien.ac.at/files/PubDat_201492.pdf



Zugeordnete Projekte:
Projektleitung Gerhard Liedl:
Thermisches Fügen von Aluminum mit Stahl


Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.