The effect of welding current on nugget geometry, microstructure and mechanical properties of TWIP steels in resistance spot welding

2021 ◽  
Author(s):  
Sadettin Şahin ◽  
Fatih Hayat ◽  
Onur Cem Çölgeçen
Keyword(s):  
Mechanical Properties ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Welding Current ◽  
Resistance Spot ◽  
Microstructure And Mechanical Properties ◽  
Twip Steels

scholarly journals Effect of Welding Current on Weld Formation, Microstructure, and Mechanical Properties in Resistance Spot Welding of CR590T/340Y Galvanized Dual Phase Steel

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2310 ◽  
Author(s):  
Xinge Zhang ◽  
Fubin Yao ◽  
Zhenan Ren ◽  
Haiyan Yu
Keyword(s):  
Mechanical Properties ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Dual Phase Steel ◽  
Welding Current ◽  
Dual Phase ◽  
Weld Formation ◽  
Resistance Spot ◽  
Microstructure And Mechanical Properties ◽  
Body Production

During resistance spot welding, the welding current is the most important process parameter, which determines the welding heat input and then has a great influence on the welding quality. In present study, the CR590T/340YDP galvanized dual phase steel widely used as automobile material was carried out using resistance spot welding. The effect of welding current on the weld formation, microstructure, and mechanical properties was studied in detail. It was found that the quality of weld appearance decreased with the increase of welding current, and there was a Zn island on the weld surface. The microstructure of the whole resistance spot welded joint was inhomogeneity. The nugget zone consisted of coarse lath martensite and a little of ferrite with the columnar crystal morphology, and the microstructure of weld nugget became coarser when the welding current was higher. There was an optimum welding current value and the tensile strength reached the maximum. This investigation will provide the process guidance for automobile body production.

Microstructure and Mechanical Properties of Mg96Zn2Y2 Joints Welded by Resistance Spot Welding

2012 ◽  
Vol 706-709 ◽  
pp. 1187-1192 ◽  
Author(s):  
Chihiro Iwamoto ◽  
Shinobu Satonaka ◽  
Yoshihito Kawamura
Keyword(s):  
Mechanical Properties ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Base Alloy ◽  
Welding Current ◽  
Mg Alloy ◽  
Tensile Yield Strength ◽  
Alloy Development ◽  
Resistance Spot ◽  
Cover Plates

Mg96Zn2Y2 is widely studied due to its high tensile yield strength and elongation. These excellent properties were considered to relate to the nanostructure of the alloy such as fine-grained α-Mg matrix and bent long period stacking ordered (LPSO) structure. In order to extend the application of this Mg alloy, development of the welding technique is indispensable. In the light of the reliability and productivity, resistance spot welding is an attractive method to join this Mg alloy. In this study, we joined the Mg alloys by the resistance spot welding with cover plates. Mechanical properties and structures of the nugget of the joints were investigated. In the case of the joints welded with cover plates, the welded region of the Mg alloy sheets were covered with steel plates to supply adequate heat for welding. Joints of extruded Mg96Zn2Y2 were obtained at relatively low welding current. The tensile strength of Mg96Zn2Y2 alloy was higher than that of the commercial Mg alloy AZ31B joints. Mg96Zn2Y2 base alloy had extended LPSO phase along extruded direction in α-Mg grains. At the nugget, net-like secondary phase was produced in the Mg grains. The relationship between the microstructure in the joints and mechanical properties were discussed.

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