Characterization of Static Performance and Failure of Resistance Spot Welds of High-Strength and Press-Hardened Steels

Microstructure and tensile-shear behavior of dissimilar resistance spot welds between 2304 duplex stainless steel and Inconel 718 superalloy

“…58 They are mainly seen in excessive welding currents and times caused by producing excessive heat input in the sheets’ interface or between the electrode and the sheet. 34,58,59 Pouranvari et al 34,60 reported the occurrence of expulsion and electrode indentation at high welding current and time as well as the reduction of the tensile-shear strength and fracture energy of the spot weld. Badkoobeh et al 57 also demonstrated that the tensile-shear strength and fracture energy of spot-welded dual-phase steels decreased at the highest silicon content due to the expulsion and electrode indentation.…”

Optimization of Double-pulse Process in Resistance Spot Welding of Hot Stamped Steel Sheet

“…Bai et al 10) tested and evaluated the hardness distribution and fracture mode of the joint cross-section. Some scholars [11][12][13][14][15] studied the weldability between hot stamped steel and dissimilar steel. Choi et al 11) studied the joint between GA780DP and hot-stamped 22MnB5, and the interfacial fracture was caused by the stress concentration resulting from the presence of the sharp notch at the boundary of the nugget as well as by the high hardness and the brittle microstructure of the weld.…”

Microstructural and mechanical characterization of steel-DP780/Al-5052 joints formed using resistance element welding with concealed rivet cover

“…1 Resistance spot welding (RSW), a fusion welding process, is widely used in the production of automobile body welding assembly and auto parts because it is fast, efficient, inexpensive, and easily mechanized and automated, along with yielding good welding surface quality. [2][3][4][5] Although RSW plays a vital role in the quality of automotive manufacturing, [6][7][8][9] its application in joining aluminum alloys and steel is challenging and presents two difficulties [10][11][12][13][14][15] : (1) The widely varying thermophysical properties of aluminum alloy and steel, such as melting point, thermal conductivity, and coefficient of linear expansion, are a source of significant stress on the joints after welding, increasing their susceptibility to cracking. (2) Under the influence of heat due to electric resistance, the aluminum alloy and steel form a series of intermetallic compounds (IMCs) at the spot-welding interface, rendering the latter extremely brittle and weak.…”

“…[2][3][4][5] Although RSW plays a vital role in the quality of automotive manufacturing, [6][7][8][9] its application in joining aluminum alloys and steel is challenging and presents two difficulties [10][11][12][13][14][15] : (1) The widely varying thermophysical properties of aluminum alloy and steel, such as melting point, thermal conductivity, and coefficient of linear expansion, are a source of significant stress on the joints after welding, increasing their susceptibility to cracking. (2) Under the influence of heat due to electric resistance, the aluminum alloy and steel form a series of intermetallic compounds (IMCs) at the spot-welding interface, rendering the latter extremely brittle and weak. In contrast, the resistance element welding (REW) process, which converts the main bearing part of the joint into a connection of the same material, effectively avoids the problem of hard and brittle phases prone to direct RSW of dissimilar metals.…”