Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Thick metal sheets for light ships: welding steel and aluminum

03.11.2015

Light, resource-efficient and at the same time robust - what is good for lightweight construction in the automobile industry is just as important for ship construction. Therefore, steel-aluminum joints are also used for ships. However, ships need completely different material thicknesses. The ten partners of the project LaSAAS, under the leadership of the Laser Zentrum Hannover e.V. (LZH), are dedicated to developing a robust laser welding process for the maritime manufacturing.

In times of scarce resources it is also important in the ship industry to lower fuel consumption and carbon dioxide output, in order to reduce the environmental impact. Already, components are being made using weight-reducing steel-aluminum constructions, such as ship hulls made of steel and superstructures made of aluminum.


Laser welding of steel to aluminum.

Photo: LZH

In addition, such hybrid material constructions lower the center of gravity of the ship and thus stabilize it. At the moment, the different metals are joined using an adapter piece. This is done using explosive cladding, a complicated and cost intensive joining technology.

Joining steel directly to aluminum

The scientists and industrial partners of the joint project LaSAAS want to replace this adapter piece. For this purpose, the system manufacturers Precitec GmbH & Co. KG, Scansonic MI GmbH and TRUMPF Laser- und Systemtechnik GmbH are working together with the LZH to develop a laser processing head with a weld penetration depth control.

Using this, the LZH will develop a laser welding process under lab conditions that will later be tested in cooperation with the LASER on demand GmbH. Afterwards, the process will be transferred to actual applications with the semi-finished product manufacturers Druckguss Service Deutschland GmbH and Hilbig GmbH as well as the shipyards Fr. Lürssen Werft GmbH & Co. KG and MEYER WERFT GmbH & Co. In addition, the Fraunhofer Institute for Structural Durability and System Reliability (LBF) will examine the fatigue behavior of the seams, especially under the influence of corrosive media.

Controlling the weld penetration depth

Generally, when thermally welding steel to aluminum, brittle intermetallic phases occur, so that the seams can prematurely fail under stress. However, the weld seam characteristics can be optimized based on the mix ratio of the metals, respectively the weld penetration depth. Thus, the project partners plan on controlling the weld penetration depth by analyzing the spectral process emissions and short coherence interferometry.

If successful, the process can naturally become interesting for other branches which assemble large pieces, such as train coach or commercial vehicle construction, too.

The joint project “Laser Welding of Steel to Aluminum for Applications in Shipbuilding” (LaSAAS) is funded by the German Federal Ministry for Economics and Energy (BMWi), and supervised by the Forschungszentrum Jülich GmbH (PTJ).

Dr. Nadine Tinne | Laser Zentrum Hannover e.V.
Further information:
http://www.lzh.de/

More articles from Machine Engineering:

nachricht Fraunhofer IWS Dresden collaborates with a strong research partner in Singapore
15.02.2017 | Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS

nachricht Russian researchers developed high-pressure natural gas operating turbine-generator
06.02.2017 | Peter the Great Saint-Petersburg Polytechnic University

All articles from Machine Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Safe glide at total engine failure with ELA-inside

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded after a glide flight with an Airbus A320 in ditching on the Hudson River. All 155 people on board were saved.

On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded...

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

New technology offers fast peptide synthesis

28.02.2017 | Life Sciences

WSU research advances energy savings for oil, gas industries

28.02.2017 | Power and Electrical Engineering

Who can find the fish that makes the best sound?

28.02.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>