scholarly journals Effect of tool geometry and welding parameters on the microstructure and static strength of the friction-stir spot-welded DP780 dual-phase steel sheets

2017 ◽  
Vol 51 (4) ◽  
pp. 687-694 ◽  
Author(s):  
O. Abedini ◽  
E. Ranjbarnodeh ◽  
P. Marashi
Keyword(s):  
Dual Phase Steel ◽  
Static Strength ◽  
Tool Geometry ◽  
Welding Parameters ◽  
Dual Phase ◽  
Friction Stir ◽  
Steel Sheets ◽  
Spot Welded

scholarly journals Fracture response of resistance spot welded dual phase steel sheets: Experiments and modeling

2020 ◽  
Vol 187 ◽  
pp. 105869
Author(s):  
Kedar S. Pandya ◽  
Vincent Grolleau ◽  
Christian C. Roth ◽  
Dirk Mohr
Keyword(s):  
Dual Phase Steel ◽  
Dual Phase ◽  
Resistance Spot ◽  
Steel Sheets ◽  
Spot Welded

3448 Effect of Tool Geometry on Static Strength of Friction Stir Spot Welded Joints

2006 ◽  
Vol 2006.1 (0) ◽  
pp. 607-608
Author(s):  
Yoshihiko UEMATSU ◽  
Yasunari TOZAKI ◽  
Keiro TOKAJI
Keyword(s):  
Welded Joints ◽  
Static Strength ◽  
Tool Geometry ◽  
Friction Stir ◽  
Spot Welded

Effect of Dwell Time on Friction Stir Spot Welded Dual Phase Steel

2009 ◽  
Vol 83-86 ◽  
pp. 1143-1150 ◽  
Author(s):  
A. Al-Shahrani ◽  
Bradley P. Wynne
Keyword(s):  
Mechanical Properties ◽  
Spot Welding ◽  
Dwell Time ◽  
Dual Phase Steel ◽  
Energy Savings ◽  
Ferrite Matrix ◽  
Parent Material ◽  
Dual Phase ◽  
Friction Stir ◽  
Spot Welded

Friction stir spot welding (FSSW) is a relatively new welding technique which has already been successfully commercially applied on automotive aluminum alloys which, in turn, lead to significant energy savings and infrastructure cost-reductions. Due to the success of FSSW on Al alloys FSSW has generated tremendous interest in the automotive industry as an alternative joining process to resistance sport welding for steel body panels. Currently there is limited data on the mechanical properties and microstructure of friction stir spot welded steel thus the current aim was to investigate how these parameters chamged as a function of some critical process variables. In this instance spot welding of 2 mm thick high strength dual phase steel (DP800) was undertaken using a 3.5mm pin length tungsten rhenium tool with a tool rotation speed of 1000 rpm and plunge rate of 100 mm/min. Different dwell times of 0, 0.5, 1, 2 and 4 seconds were then applied prior to tool retraction to study the effect of dwell time on the microstructure and mechanical properties of the spot welds. Investigation of the weld spot joints revealed three distinct microstructural zones; a) thermo-mechanically affected zone (TMAZ), b) heat affected zone (HAZ), and c) parent material zone. The TMAZ shows an acicular martensite microstructure while the HAZ shows a ferrite/martensite structure in a very fine scale when compared to parent material zone. The Parent material is a typical dual phase structure which is ferrite matrix with a dispersion of martensite. Therefore, the TMAZ was harder while HAZ was softer when compared with parent material zone. The tensile strength obtained from tensile tests and the bonding ligament which has been reported to be measures of strength were also found to increase with dwell time.

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