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Welding of Ultra High Strength Steels

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Abstract:

The ongoing need to reduce the weight of products while increasing strength has resulted in new generation steel manufacturing using special heat treatments to produce High Strength Steels (HSS) and Ultra High Strength Steels (UHSS) with up to 1700 MPa tensile strength. The high strength level of these steels makes it possible to produce structures with a considerable weight and cost reduction, and such steels have been adopted in the automotive industry and for mobile heavy equipment. Welding of UHSS is, however, not without its complications and welding processes for these steels need careful attention. For instance, their high susceptibility to cracking and Heat Affected Zone (HAZ) softening are risks that need to be borne in mind when choosing welding parameters. This research work discusses the difficulties and challenges of successful welding of UHSS. Common welding methods used in welding of UHSS are briefly reviewed to gain a better understanding of the effects of different welding parameters and methods. The paper finds that UHSS can be satisfactorily welded with laser welding, electron beam welding, resistance welding, and conventional arc welding methods, but the quality of the weld is dependent on appropriate control of several parameters and variables of the welding processes.

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Periodical:

Advanced Materials Research (Volume 849)

Pages:

357-365

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.849.357

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Online since:

November 2013

Authors:

Paul Kah, Markku Pirinen, Raimo Suoranta, Jukka Martikainen

Keywords:

Filler Material, Heat Input, HSS, UHSS, Welding Processes

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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