Laser Technique Shortens Welding Process for Heat-Treatable Steels

Heat-treatable steels are often used for highly stressed construction elements, since they show a high tensile and endurance strength resulting from the heat treatment. In order to weld heat-treatable steels, they must pass through a complex multi-step process. This enables a flawless and stress-resistant weld between both construction elements.

The LZH and the ETP have now developed a process which combines inductive hardening and laser beam welding of multi-part construction elements in one process step. The construction elements are heated to a temperature of over 900°C, the parts are laser welded and then quenched.

The so called “hot welding” immediately reduces tensions occurring during the welding process, so that the danger of cold cracks in the welding seam and a softening of the basic material are avoided.

In order to achieve this, a processing head has been conceived and constructed, which combines inductive heating, the welding process and quench hardening in one step. The processing head consists of a laser processing head, an inductor, a quench shower and a shielding gas nozzle.

In comparison to construction elements which have not been preheated, the processing head used increased the welding depth by 25%. The welding seams and the heat-affected zone show a homogenous hardness distribution. Also, martensitic structures were detected in both areas. After the welding/hardening process has been complete, it is also possible to harden the surface of the construction material using the inductor.

The hot welding process significantly shortens the processing time for heat-treatable steels, and simplifies the process run. In addition, the process simulation developed in the project can be used for an exact calculation of the process.

This research project was funded by the Stiftung Stahlanwendungsforschung, Essen, and coordinated by the Forschungsvereinigung Stahlanwendung e.V., Düsseldorf.

Contact:
Laser Zentrum Hannover e.V.
Michael Botts
Hollerithallee 8
D-30419 Hannover
Germany
Tel.: +49 511 2788-151
Fax: +49 511 2788-100
E-Mail: m.botts@lzh.de
The Laser Zentrum Hannover e.V. (LZH) carries out research and development in the field of laser technology and is supported by the Ministry of Economic Affairs, Labour and Transport of the State of Lower Saxony (Niedersächsisches Ministerium für Wirtschaft, Arbeit und Verkehr).

You can find the LZH press releases with pictures at www.laser-zentrum-hannover.de/en/ (English) under “publications/press releases”

Media Contact

Michael Botts idw

More Information:

http://www.lzh.de

All latest news from the category: Process Engineering

This special field revolves around processes for modifying material properties (milling, cooling), composition (filtration, distillation) and type (oxidation, hydration).

Valuable information is available on a broad range of technologies including material separation, laser processes, measuring techniques and robot engineering in addition to testing methods and coating and materials analysis processes.

Back to home

Comments (0)

Write a comment

Newest articles

Lighting up the future

New multidisciplinary research from the University of St Andrews could lead to more efficient televisions, computer screens and lighting. Researchers at the Organic Semiconductor Centre in the School of Physics and…

Researchers crack sugarcane’s complex genetic code

Sweet success: Scientists created a highly accurate reference genome for one of the most important modern crops and found a rare example of how genes confer disease resistance in plants….

Evolution of the most powerful ocean current on Earth

The Antarctic Circumpolar Current plays an important part in global overturning circulation, the exchange of heat and CO2 between the ocean and atmosphere, and the stability of Antarctica’s ice sheets….

Partners & Sponsors