Resistance Spot-Welding of Dissimilar Metals, Medium Manganese TRIP Steel and DP590
Abstract
:1. Introduction
2. Materials and Method
3. Results and Discussion
3.1. Influence of Single-Pulse Welding Process
3.2. Influence of Double-Pulse-Tempering Process
4. Conclusions
- Through the method of control variables, the optimal welding parameters under a single pulse were determined as follows: welding current: 9 kA, welding time: 300 ms and electrode pressure: 4.5 kN. The optimal added tempering process parameters were as follows: tempering current: 7.5 kA, and cooling time: 1500 ms.
- The nugget diameter and thickness reduction increase with the increase in welding current and welding time. When expulsion occurs, the thickness reduction increases continuously but the nugget diameter decreases. The nugget diameter first increases, and then, decreases with the increase in electrode pressure.
- The tempered line of the DP590 side is shorter than that of 7Mn Steel side. The microstructure of the tempering zone is composed of island martensite tempering and ferrite, and fine quasi-spherical and lamellar interlayer cementite is formed.
- There is a strong halo effect in the single-pulse weld, which acts as a failure path. The second pulse of tempering makes the microstructure uniform, resulting in different failure paths and weld strengthening.
- The failure mode of the welding spot under the single-pulse optimal process is PF-TT failure. After adding the tempering current, the fracture mode does not change, and is still PF-TT failure. The fracture position is still in the heat-affected zone of 7Mn Steel, but the tensile shear force increases from 11.44 kN to 13.4 kN, increasing by 17.13%.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Base Metal | C | Mn | Si | Cr | Al | N | Pb | P | S |
---|---|---|---|---|---|---|---|---|---|
DP590 | 0.071 | 1.84 | 0.43 | - | - | - | - | 0.011 | 0.02 |
7Mn | 0.13 | 6.98 | 0.22 | 0.09 | 0.04 | 0.0099 | 0.008 | 0.006 | 0.0011 |
Base Metal | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (Pct) |
---|---|---|---|
7Mn Steel | 1580 | 1664 | 16.5 |
DP590 | 488 | 737 | 32.3 |
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Wei, F.; Zhu, Y.; Tian, Y.; Liu, H.; Zhou, Y.; Zhu, Z. Resistance Spot-Welding of Dissimilar Metals, Medium Manganese TRIP Steel and DP590. Metals 2022, 12, 1596. https://doi.org/10.3390/met12101596
Wei F, Zhu Y, Tian Y, Liu H, Zhou Y, Zhu Z. Resistance Spot-Welding of Dissimilar Metals, Medium Manganese TRIP Steel and DP590. Metals. 2022; 12(10):1596. https://doi.org/10.3390/met12101596
Chicago/Turabian StyleWei, Fufa, Yunming Zhu, Yifeng Tian, Hongning Liu, Yongqiang Zhou, and Zhengqiang Zhu. 2022. "Resistance Spot-Welding of Dissimilar Metals, Medium Manganese TRIP Steel and DP590" Metals 12, no. 10: 1596. https://doi.org/10.3390/met12101596