scholarly journals Prediction of the Shear Tension Strength of Resistance Spot Welded Thin Steel Sheets from High- to Ultrahigh Strength Range

2021 ◽  
Author(s):  
Kornél Májlinger ◽  
Levente T. Katula ◽  
Balázs Varbai
Keyword(s):  
High Strength Steel ◽  
Welding Process ◽  
High Strength ◽  
Professional Literature ◽  
Resistance Spot ◽  
Base Materials ◽  
Ultra High Strength Steel ◽  
Steel Grades ◽  
Steel Joints ◽  
Tension Strength

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.

Inductively supported laser beam welding of high and ultra high strength steel grades

2008 ◽  
Author(s):  
Katrin Harley ◽  
Heinz Haferkamp ◽  
Andreas Ostendorf ◽  
Dirk Herzog ◽  
Peter Kallage
Keyword(s):  
Laser Beam ◽  
High Strength Steel ◽  
Laser Beam Welding ◽  
High Strength ◽  
Ultra High Strength Steel ◽  
Steel Grades

Study on Microstructure and Properties of Welded Joints with Low Strength Backing Layer for WELDOX960

2021 ◽  
Vol 904 ◽  
pp. 154-158
Author(s):  
Zhi Ling Wang
Keyword(s):  
Acicular Ferrite ◽  
High Strength Steel ◽  
Welding Process ◽  
High Strength ◽  
Hardness Test ◽  
Basic Structure ◽  
Economic Benefits ◽  
Ultra High Strength Steel ◽  
Backing Layer ◽  
Low Strength

The welding of WELDOX960 ultra-high strength steel must consider not only the strength but also the toughness of the welding zone. In this paper, a new welding process with low strength matching backing layer is studied, that is, we choose ER50-6 wire for backing welding, use T union gm120 wire for MAG welding filling, and complete the cover welding. We prepared two groups of welding samples of ER50-6 wire backing welding and T union gm120 wire backing welding. Then we test the samples by optical metallography, tensile test, impact test and hardness test. The results show that the properties of the two kinds of backing weld can meet the requirements. The basic structure of the weld outside the backing layer of the two welding methods is similar, which are acicular ferrite and carbide. Using ER50-6 welding wire as backing, the microstructure of the weld is uniform and fine ferrite grain and a small amount of pearlite. Using T union GM120 high strength steel as backing, the microstructure of the weld is acicular ferrite and carbide. The toughness of ER50-6 is higher than that of T union GM120, and the hardness is lower than that of T union GM120.The research results have been successfully applied to the welding of large tonnage truck crane boom, and the enterprise has achieved high economic benefits.

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