A1 Journal article (refereed), original research

Weldability of cold-formed high strength and ultra-high strength steels


Open Access publication

Publication Details
Authors: Afkhami Shahriar, Björk Timo, Larkiola Jari
Publisher: Elsevier
Publication year: 2019
Language: English
Related Journal or Series Information: Journal of Constructional Steel Research
Volume number: 158
Start page: 86
End page: 98
Number of pages: 13
ISSN: 0143-974X
eISSN: 1873-5983
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2019032910499

Abstract

Hollow sections
and cold-formed steels have a key role in modern structures and
machinery. In addition, to benefit from full potentials of cold-formed
steels, it is usually required to weld them to other steel parts of structures. However, data provided by relevant standards, such as Eurocode
3, do not cover newly developed high strength and ultra-high strength
grades of this material. Thus, further study is critical to complete
available data in literature and standards. Regarding this matter,
having a good weldability for cold-formed high and ultra-high strength steels is vital for development of contemporary steel structures. Thus, newly developed steels S700MC and S1100 were selected to be investigated in this study. To do so, bended base metals with different degrees of cold-forming were welded to their straight (virgin) counterparts. Next, welded joints were investigated via microstructural analysis, hardness measurement, tensile test, and Charpy impact test
to assess the weldabilities of the cold-formed base metals. Results
show that the final joints had acceptable characteristics, and the
cold-formed base metals showed good weldability. However, bending and
pre-straining criteria recommended by the manufacturer must be satisfied
to have an acceptable joint after welding. Beyond that criteria, fracture elongation and notch toughness of the welded joints decreased, and some welded samples failed from their cold-formed base metals.


Last updated on 2019-23-04 at 09:53