Resistance Spot Welding Technology to Suppress Liquid Metal Embrittlement Cracking in Ultra High Strength Steel Sheets

2021 ◽  
Vol 90 (7) ◽  
pp. 492-496
Author(s):  
Katsutoshi TAKASHIMA
Keyword(s):  
Liquid Metal ◽  
Resistance Spot Welding ◽  
High Strength Steel ◽  
Spot Welding ◽  
High Strength ◽  
Liquid Metal Embrittlement ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Welding Technology ◽  
Ultra High Strength Steel

scholarly journals Liquid Metal Embrittlement of Galvanized TRIP Steels in Resistance Spot Welding

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 787 ◽  
Author(s):  
Wook-Sang Jeon ◽  
Ashutosh Sharma ◽  
Jae Pil Jung
Keyword(s):  
Liquid Metal ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
High Strength Steels ◽  
High Strength ◽  
Liquid Metal Embrittlement ◽  
Surface Cracks ◽  
Resistance Spot ◽  
Research Activities ◽  
Microscopic Features

Liquid metal embrittlement (LME) in Zn-coated steels is a serious issue in automotive design. The risk of rising LME surface cracks in resistance spot welding (RSW) of Zn-coated high strength steels has triggered significant research activities across the globe. This paper presents a state-of-the-art review of the various phenomena and issues related to LME during RSW. Various aspects of LME surface cracks have been described in this review, focusing on the macro- and microscopic features of LME, spot weld cracks, the sensitivity of the LME cracks towards surface locations, welding conditions, and susceptibility to high strength and galvanized steels. We also focus on the effects of various processing factors, such as temperature, stress, microstructure, and the nature of the galvanized layer, related to studies with actual spot welds LME cracks. Finally, we summarize the possible mechanisms of embrittlement and the remedies for minimizing LME cracks, with suitable guidelines to suppress surface cracks during RSW.

scholarly journals Fatigue Strength of High Strength Steel Sheets Joined by Hemming Process

2015 ◽  
Vol 773-774 ◽  
pp. 282-286 ◽  
Author(s):  
Zamzuri Hamedon ◽  
Ken Ichiro Mori ◽  
Yohei Abe
Keyword(s):  
Resistance Spot Welding ◽  
High Strength Steel ◽  
Spot Welding ◽  
High Strength ◽  
Fatigue Tests ◽  
The Body ◽  
Hollow Section ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Passenger Safety

It is strongly desirable for the vehicle to improve passenger safety and at the same time to reduce the weight of the vehicles. A hollow section for the body structure of automobiles is studied. A high strength steel sheet is used to make the hollow sections in this studied, which are typically joined by resistance spot welding have insufficient energy absorption because the joins are not continuous. Thus, to overcome this problem, the hollow section is joined using the hemming process. The high strength steel hollow sections joined by hemming and resistance spot welding were then examined by tensile and fatigue tests. The hollow section with hemmed joins showed better performance in both tests. The overlapping joins of the hemmed hollow section have greater strength as compared to the resistance of spot welding joins.

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