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Typical chemical composition of INCONEL 718 (mass fraction, %)_
| C | Si | Mn | Mo | S | Ni | Cr | Nb |
|---|---|---|---|---|---|---|---|
| ≤0.08 | ≤0.35 | ≤0.35 | 2.8–3.3 | ≤0.01 | 50–55 | 17–21 | 4.75–5.5 |
Orthogonal test analysis_
| No. | A. laser power (W) | B. Welding speed (mm/s) | C. Duty cycle (%) | Tensile strength (MPa) |
|---|---|---|---|---|
| 1 | 270 | 50 | 50 | 780 |
| 2 | 270 | 55 | 55 | 809 |
| 3 | 270 | 60 | 60 | 817 |
| 4 | 300 | 50 | 55 | 830 |
| 5 | 300 | 55 | 60 | 840 |
| 6 | 300 | 60 | 50 | 810 |
| 7 | 330 | 50 | 60 | 815 |
| 8 | 330 | 55 | 50 | 803 |
| 9 | 330 | 60 | 55 | 846 |
| K 1 | 802 | 808 | 798 | |
| K 2 | 827 | 817 | 828 | |
| K 3 | 821 | 824 | 824 | |
| R | 25 | 16 | 31 | |
| Priority factors | C > A > B | |||
| Optimal solution | 300 | 60 | 55 | 856 |
Macroscopic morphology of weld seam under different duty cycles_
| No. | Duty cycle (%) | Front side | Reverse side |
|---|---|---|---|
| a | 50 |
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| b | 55 |
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| c | 60 |
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Test factors and level of distribution_
| Level | A. Laser power (W) | B. Welding speed (mm/s) | C. Duty cycle (%) |
|---|---|---|---|
| 1 | 270 | 50 | 50 |
| 2 | 300 | 55 | 55 |
| 3 | 330 | 60 | 60 |