Seismic Requirements for the Welding and Inspection of the K-Area in Hot Rolled Products to AS/NZS 3679.1

Hot-rolled products such as beams are usually subject to rotary straightening as a last step in the manufacturing process. This operation may change the properties of the plastically deformed area by strain hardening. The affected regions of the beam are referred to as the “k-area”, as shown in Figu...

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Bibliographic Details
Published inKey engineering materials Vol. 763; pp. 197 - 206
Main Authors Karpenko, Michail, McClintock, Alan, Heinzel, Holger, Helms, Marlon
Format Journal Article
LanguageEnglish
Published Zurich Trans Tech Publications Ltd 01.02.2018
Subjects
Deformation
Earthquake construction
Fracture toughness
Hot rolling
Inspection
Notch toughness
Performance tests
Steel industry
Stiffeners
Strain hardening
Weld defects
Welding
New Zealand
K-Area
Welding
Hot-Rolled
Structural
Seismic
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Summary:Hot-rolled products such as beams are usually subject to rotary straightening as a last step in the manufacturing process. This operation may change the properties of the plastically deformed area by strain hardening. The affected regions of the beam are referred to as the “k-area”, as shown in Figure 1. Strain hardening reduces the ductility and notch toughness of the steel and can potentially lead to cracking in the k-area when welding is carried out in restrained conditions e.g. addition of stiffeners by welding. The phenomenon was reported for wide flange beams in the US literature in the 1990s. Welding limitations and increased inspection requirements in these areas were introduced to AISC and AWS D1.8 codes [1]. Similar requirements can be found in New Zealand Standard NZS 3404.1 [2]. However, it is unclear if steel products used in New Zealand are affected by this phenomenon. A series of welding and performance tests were carried out at HERA using hot rolled products UB610, UC310, UB310 and UC200 of material grade 300S0 to AS/NZS 3679.1 [3]. The material is commonly used in New Zealand for seismic construction. Welded test specimens were subject to a range of testing, including mechanical and cold cracking susceptibility tests. Test setup and results are reported in the paper. The authors present recommendations for future standard developments.
Bibliography:Selected, peer reviewed papers from the 9th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA 2018), February 14-17, 2018, Christchurch, New Zealand
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ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.763.197