Abstract
The tensile strength of newly developed ultra-high strength steel grades is now above 1800 MPa, and even new steel grades are currently in development. One typical welding process to join thin steels sheets is resistance spot welding (RSW). Some standardized and not standardized formulas predict the minimal shear tension strength (STS) of RSWed joints, but those formulas are less and less accurate with the higher base materials strength. Therefore, in our current research, we investigated a significant amount of STS data of the professional literature and our own experiments and recommended a new formula to predict the STS of RSWed high strength steel joints. The proposed correlation gives a better prediction than the other formulas, not only in the ultra-high strength steel range but also in the lower steel strength domain.
Highlights
High strength steels (HSS) are gaining more and more attention and application in mechanical engineering, especially in the automotive industries [1–3]
In our current research, we investigated a significant amount of shear tension strength (STS) data of the professional literature and our own experiments and recommended a new formula to predict the STS of RSWed high strength steel joints
Most of the ultra-high strength steel (UHSS) steels have a low carbon content; we investigated this correlation too (Eq [3])
Summary
High strength steels (HSS) are gaining more and more attention and application in mechanical engineering, especially in the automotive industries [1–3]. A new correlation has been proposed to predict the STS values with better accuracy in the UHSS steel range (Rm > 1340 MPa) for thin sheets (≤ 3 mm thickness).
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