Study on Medium-Thick Al-Alloy T-Joints by Dual P-GMAW Bilateral Synchronous Welding
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Experimental Setup
2.3. Experimental Parameters
3. Results and Discussion
3.1. Effect of Heat Input
3.2. Effect of Root Opening between Work-Pieces
3.3. Effect of Distance between the Two Torches on Both Sides
3.4. Microstructure in the Welded Joint
3.5. Hardness Distribution
3.6. Welded Joint Deformation
4. Conclusions
- (1)
- In the T-joint welding for medium-thick Al-alloy plates by dual P-GMAW bilateral synchronous welding using the adaptive deposition method, the linear energy of WFS 9.5 m/min was the maximum value to ensure the weld formation with high quality based on the root opening of 0 or 1 mm.
- (2)
- The molten pool/liquid metal was pushed to the opposite side of the groove at the root opening exceeding 2 mm. The molten pool on the opposite side would affect the liquid metal flow, leading to an unstable droplet transfer and unstable welding process in dual P-GMAW bilateral synchronous welding.
- (3)
- A quality weld and welded joint were obtained both in symmetric and asymmetric welding source of dual P-GMAW bilateral synchronous welding. During the asymmetric welding process, the distance between the two torches should exceed the length of the weld pool but be less than 20 mm, and in this paper, the distance of 15 mm was selected. When the distance between the two welding torches exceeded 20 mm, the molten pool was completely separated, and process pores were observed in the unfused root zone.
- (4)
- The hardness distribution of the welded joint was influenced by the thermal cycles. The hardness in WZ (about 80 HV) was larger than the HAZ in the base plate (65 HV) while lower than HAZ in the vertical plate (90 HV).
- (5)
- Comparing dual P-GMAW bilateral synchronous welding with a symmetric welding source, deformation of the welded joint during an asymmetric welding source was reduced by 20%, which was caused by the asymmetric welding thermal cycle on both sides of the base plate that was being welded.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Materials | Si | Mn | Mg | Fe | Cu | Ti | Cr | Al |
---|---|---|---|---|---|---|---|---|
6082-T6 | 0.95 | 0.86 | 0.57 | 0.31 | 0.06 | 0.02 | 0.02 | Bal. |
ER5087 | 0.06 | 0.77 | 4.89 | 0.28 | 0.02 | 0.07 | 0.10 | Bal. |
Parameters | Value/Units |
---|---|
Travel speed (TS) | 2.0–6.0 m/min |
Wire feed speed (WFS) Wire diameter Shielding gas Shielding gas flow rate Root opening | 6.0–10.0 m/min 1.6 mm Argon (99.999% purity) 15 L/min 0–3 mm |
WFS (m/min) | 6 | 7 | 8 | 9 | 10 |
---|---|---|---|---|---|
TS (mm/s) Root opening: 0 mm | 3.5 | 4.0 | 4.6 | 5.2 | 5.8 |
TS (mm/s) Root opening: 1 mm | 2.9 | 3.3 | 3.8 | 4.2 | 4.7 |
TS (mm/s) Root opening: 2 mm | 2.4 | 2.8 | 3.2 | 3.6 | 3.9 |
TS (mm/s) Root opening: 3 mm | 2.0 | 2.4 | 2.7 | 3.0 | 3.4 |
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Wang, C.; Zhang, H.; Yan, Z.; Zhao, Y.; Chen, S. Study on Medium-Thick Al-Alloy T-Joints by Dual P-GMAW Bilateral Synchronous Welding. Metals 2021, 11, 1794. https://doi.org/10.3390/met11111794
Wang C, Zhang H, Yan Z, Zhao Y, Chen S. Study on Medium-Thick Al-Alloy T-Joints by Dual P-GMAW Bilateral Synchronous Welding. Metals. 2021; 11(11):1794. https://doi.org/10.3390/met11111794
Chicago/Turabian StyleWang, Chunsheng, Haicang Zhang, Zhaoyang Yan, Yun Zhao, and Shujun Chen. 2021. "Study on Medium-Thick Al-Alloy T-Joints by Dual P-GMAW Bilateral Synchronous Welding" Metals 11, no. 11: 1794. https://doi.org/10.3390/met11111794