Effect of Additional Shielding Gas on Welding Seam Formation during Twin Wire DP-MIG High-Speed Welding
Abstract
:1. Introduction
2. Experimental Methods and Materials
2.1. Experimental Equipment and Methods
2.2. Experimental Materials and Processing
3. Results
3.1. Formation of the Weld Seam
3.2. Results of Metallographic Tests
3.3. Mechanical Properties
4. Conclusions
- (1)
- The welding process is more stable; the weld width is more uniform; the unfused defects of the weld can be effectively improved and diminished.
- (2)
- Due to the action of the external gas flow, the fluidity of the molten pool metal is better than that formed without additional shielding gas. The heat-affected zone is smaller than that of the weld seam formed without the additional shielding gas.
- (3)
- The tensile properties of the welded joints are significantly improved. When the welding speed was 1.6, 1.8, and 2.0 m/min, the maximum tensile strength of the joints increased by 19.7%, 8.2% and 11.3%, respectively.
- (4)
- At the same welding current and welding speed, the absorbed energy of the joint without the additional shielding gas ranges from 12 to 18.2 J (22.2–33.7% of the base metal), while the absorbed energy of the joint with the additional shielding gas ranges from 27 to 30 J (50–55.6% of the base metal), indicating that the joint with additional shielding gas has higher absorbed energy and better toughness.
Author Contributions
Funding
Conflicts of Interest
References
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Materials | C | Mn | Si | Cr | Ni | Mo | N | S | P |
---|---|---|---|---|---|---|---|---|---|
2205 | 0.024 | ≤2.0 | ≤1.0 | 22–23 | 4.5–6.5 | 3.0–3.5 | 0.15–0.2 | ≤0.02 | ≤0.03 |
ER2209 | 0.025 | 1.6 | 0.3 | 22.5 | 9.5 | 3.1 | 0.16 | 0.01 | 0.025 |
Sample Number | Flowrate of Additional Shielding Gas L/min | Weld Speed cm/min |
---|---|---|
1 | 0 | 160 |
2 | 12 | 160 |
3 | 0 | 180 |
4 | 12 | 180 |
5 | 0 | 200 |
6 | 12 | 200 |
No. | Weld Shape | Section of Joints |
---|---|---|
1 | ||
2 | ||
3 | ||
4 | ||
5 | ||
6 |
Sample Number | Absorbed Energy (J) | ||||
---|---|---|---|---|---|
1 | 2 | 3 | Average Value | Standard Deviation | |
Base Metal | 53.5 | 53.8 | 54.7 | 54 | 0.5 |
1 | 17.9 | 18.1 | 18.6 | 18.2 | 0.3 |
2 | 29.7 | 30.1 | 29.6 | 29.8 | 0.2 |
3 | 11.8 | 11.8 | 12.4 | 12 | 0.3 |
4 | 30 | 29.9 | 30.1 | 30 | 0.1 |
5 | 17.5 | 17.3 | 16.8 | 17.2 | 0.3 |
6 | 26.8 | 26.9 | 27.3 | 27 | 0.2 |
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Hu, Y.; Xue, J.; Dong, C.; Jin, L.; Zhang, Z. Effect of Additional Shielding Gas on Welding Seam Formation during Twin Wire DP-MIG High-Speed Welding. Appl. Sci. 2018, 8, 1658. https://doi.org/10.3390/app8091658
Hu Y, Xue J, Dong C, Jin L, Zhang Z. Effect of Additional Shielding Gas on Welding Seam Formation during Twin Wire DP-MIG High-Speed Welding. Applied Sciences. 2018; 8(9):1658. https://doi.org/10.3390/app8091658
Chicago/Turabian StyleHu, Yu, Jiaxiang Xue, Changwen Dong, Li Jin, and Zhanhui Zhang. 2018. "Effect of Additional Shielding Gas on Welding Seam Formation during Twin Wire DP-MIG High-Speed Welding" Applied Sciences 8, no. 9: 1658. https://doi.org/10.3390/app8091658