Abstract
Hybrid friction stir welding, adopting an external pre-heat source in front of the friction stir welding (FSW) tool, is known as a way of overcoming the disadvantages of conventional FSW; lack of plastic flow and excessive tool wear. In joining of aluminum alloy to steel, presence of intermetallics (IMC) is essential, but its excessive growth can degrade the joint quality by its brittleness. In this study, joining of 2.5 mm thick Al5052 aluminum alloy and 1.4 mm thick DP590 high strength steel has been carried out by FSW and TIG assisted hybrid friction stir welding (HFSW) through experiments and numerical analysis. Joints characteristics of two process was compared to optimize the process parameters. A 3-D model was developed to estimate the thermal elastic–plastic characteristics of the joints. It was confirmed that the joint efficiency of HFSW joints has been improved to 84% than that of FSW (74%). 2.74 μm thickness of IMC layer was formed in HFSW joints and satisfied the permissible thickness (under 10 μm). The maximum residual stress (σzz) in welding direction was slightly higher at the HFSW joints than at the FSW joints. The overall results from experiment and simulation confirmed that HFSW is an effective way of joining Al5052 to DP590.
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Abbreviations
- k:
-
Thermal conductivity
- \({\rho }\) :
-
Density
- C:
-
Specific heat
- T:
-
Welding temperature
- t:
-
Time variable
- \(\upvarepsilon^{e}\) :
-
Elastic strain
- \(\upvarepsilon^{P}\) :
-
Plastic strain
- \(\upvarepsilon^{T}\) :
-
Thermal expansion strain
- \(\eta_{h}\) :
-
Fraction of total generated heat transferred to the workpiece
- \(\eta_{m}\) :
-
Fraction of mechanical energy
- A:
-
Contact area of workpiece surrounding the pin
- V:
-
Volume of presumed shear layer adjoining to the pin
- R:
-
Radial distance of the shear layer from the tool center
- \({\theta }\) :
-
Inclination with the welding direction
- w:
-
Rotational speed of the tool
- U:
-
Welding speeds of the tool
- \(\tau_{y}\) :
-
Temperature dependent shear yield strength of workpiece
- \(\sigma_{y}\) :
-
Yield strength based on Von Mises yield criteria
- P :
-
Axial force
- r :
-
Radial distance from axis of the tool
- \(\delta\) :
-
Frictional sliding
- \(\mu_{f}\) :
-
Coefficient of friction along the shoulder–workpiece interface
- d :
-
Energy distribution coefficient
- \(\eta\) :
-
Energy efficiency
- P W :
-
Arc power
- r eff :
-
Effective radius of TIG arc on top surface of the workpiece
- \(\sigma_{xx}\) :
-
Perpendicular residual stress, parallel to the weld line
- \(\sigma_{yy}\) :
-
Vertical directional residual stress to the weld line
- \(\sigma_{zz}\) :
-
Longitudinal residual stress, perpendicular to the weld line
- \(\sigma_{EQ}\) :
-
Equivalent residual stress
- \(\varepsilon^{P}_{EQ}\) :
-
Equivalent plastic strain
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This study was supported by research fund from Chosun University, Korea.
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Bang, HS., Hong, S.M., Das, A. et al. Study on the Weldability and Mechanical Characteristics of Dissimilar Materials (Al5052-DP590) by TIG Assisted Hybrid Friction Stir Welding. Met. Mater. Int. 27, 1193–1204 (2021). https://doi.org/10.1007/s12540-019-00461-6
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DOI: https://doi.org/10.1007/s12540-019-00461-6