Laser-gas metal arc (GMA) hybrid welding is fast, good for deep welding, and can be used to bridge large gaps.
However, for thicker high-strength, fine-grain structural steels, hot cracks and undesired hardness levels can occur in the welding seam. For this reason, in an interdisciplinary project scientists at the Laser Zentrum Hannover e.V. (LZH) and the Leibniz Universität Hannover (LUH) have developed a hybrid welding system with inductive preheating. This process can be used for reliable, high-quality, single-layer welding of high-strength, fine-grain structural steels up to a thickness of 20 mm.
Single layer laser-GMA hybrid welding: Cross-section of a weld seam of 20 mm thick high-strength, fine-grain structural steel of the grade S690QL. Photo: LZH
Experimental setup of the laser-GMA hybrid welding process with an inductive coil for preheating. Photo: LZH
In order to increase the weld seam quality for laser-GMA hybrid welding, the Joining and Cutting of Metals Group at the LZH has expanded the process to include integrated, inductive preheating. Directly before the welding process takes place, an induction coil brings energy into a targeted area of the welding seam.
Thus, the steel is preheated to the desired temperature, without direct contact. The weld seams are less brittle, fracture strain values are better, and hot cracks can be avoided. With this process, steel sheets can be welded with a single-layer, and time and material can be significantly saved.
Developed for Practical Application
The process was developed for high-strength, fine-grain structural steels with yield strengths from 460 to 690 N/mm². Applications for the used grades S700MC, X70 and S690QL can be found in crane, pump, pipeline and bridge construction, and in offshore areas. With this process, depending on the sheet thickness, feed rates of 0.75 m/min to 2.5 m/min can be reached.
The basis for the project was close cooperation between the material and process technicians from the LZH, and the engineers from the civil engineering and electrical engineering fields at the LUH. While the engineers at the LZH experimented with welding processes, the Institute for Electrotechnology and the Institute for Steel Construction (both LUH) made simulations of the preheating process, respectively the welding process, and evaluated the welding seams.
The project DOVOR – High-performance welding of high-strength, fine-grained steels with high process reliability, using a hybrid welding process with integrated preheating – was financially supported by the German Federation of Industrial Research Associations "Otto von Guericke" e.V. (AiF) and the Research Association for Steel Application (FOSTA).
http://www.lzh.de/en/publications/pressreleases/2014/reliable-joining-of-high-st... - further illustration and a video
Lena Bennefeld | Laser Zentrum Hannover e.V.
New process for cell transfection in high-throughput screening
21.03.2016 | Laser Zentrum Hannover e.V.
Sustainable products: Fraunhofer LBF investigates recycling of halogen-free flame retardant
17.02.2016 | Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF
Physicists in Innsbruck have realized the first quantum simulation of lattice gauge theories, building a bridge between high-energy theory and atomic physics. In the journal Nature, Rainer Blatt‘s and Peter Zoller’s research teams describe how they simulated the creation of elementary particle pairs out of the vacuum by using a quantum computer.
Elementary particles are the fundamental buildings blocks of matter, and their properties are described by the Standard Model of particle physics. The...
A year and a half on the outer wall of the International Space Station ISS in altitude of 400 kilometers is a real challenge. Whether a primordial bacterium...
Researchers at Case Western Reserve University have developed a way to swiftly and precisely control electron spins at room temperature.
A physics experiment performed at the National Institute of Standards and Technology (NIST) has enhanced scientists' understanding of how free neutrons decay...
Chemically the same, graphite and diamonds are as physically distinct as two minerals can be, one opaque and soft, the other translucent and hard. What makes...
09.06.2016 | Event News
24.05.2016 | Event News
20.05.2016 | Event News
24.06.2016 | Materials Sciences
24.06.2016 | Physics and Astronomy
24.06.2016 | Physics and Astronomy