J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (12): 2240-2245.DOI: 10.1016/j.jmst.2018.06.009
Special Issue: 2017-2018年Mg合金专题
• Orginal Article • Previous Articles Next Articles
Fangzhou Yangab, Jie Zhoua(), Rongrong Dinga
Received:
2017-05-11
Revised:
2017-07-08
Accepted:
2017-07-16
Online:
2018-12-20
Published:
2018-11-15
Fangzhou Yang, Jie Zhou, Rongrong Ding. Ultrasonic vibration assisted tungsten inert gas welding of dissimilar magnesium alloys[J]. J. Mater. Sci. Technol., 2018, 34(12): 2240-2245.
Alloys | Al | Zn | Mn | Fe | Si | Mg |
---|---|---|---|---|---|---|
AZ31 | 2.9 | 0.88 | 0.41 | 0.01 | 0.05 | Bal. |
MB3 | 4.8 | 0.92 | 0.49 | 0.05 | 0.10 | Bal. |
Wire | 2.8 | 0.79 | 0.32 | .. | 0.04 | Bal. |
Table 1 Chemical composition (wt%) of base metals and filler wire.
Alloys | Al | Zn | Mn | Fe | Si | Mg |
---|---|---|---|---|---|---|
AZ31 | 2.9 | 0.88 | 0.41 | 0.01 | 0.05 | Bal. |
MB3 | 4.8 | 0.92 | 0.49 | 0.05 | 0.10 | Bal. |
Wire | 2.8 | 0.79 | 0.32 | .. | 0.04 | Bal. |
Welding parameters | Values |
---|---|
Welding current, I (A) | 70¬??110 |
Welding speed, v (m min¬??1) | 0.2 |
Filler feed speed, vw (m min¬??1) | 0.5 |
Flow rate of protective gas (L min¬??1) | 9 |
Diameter of tungsten electrode (mm) | 2.5 |
Arc voltage (V) | 17 |
Table 2 Welding parameters applied in the present study.
Welding parameters | Values |
---|---|
Welding current, I (A) | 70¬??110 |
Welding speed, v (m min¬??1) | 0.2 |
Filler feed speed, vw (m min¬??1) | 0.5 |
Flow rate of protective gas (L min¬??1) | 9 |
Diameter of tungsten electrode (mm) | 2.5 |
Arc voltage (V) | 17 |
Fig. 3. Typical cross-sectional macrostructures of AZ31/MB3 weldments under different current: (a-e) joints welded with current of 70, 80, 90, 100 and 110 A, respectively.
Fig. 4. Typical cross-sectional macrostructures of AZ31/MB3 weldments under optimized ultrasonic power of 1.0 kW and different currents: (a-e) joints welded with current of 70, 80, 90, 100 and 110 A, respectively.
Fig. 5. Typical cross-sectional macrostructures of AZ31/MB3 weldments under welding current of 110 A and different ultrasonic power: (a-d) joints welded with ultrasonic power of 0, 0.5, 1.0 and 1.5 kW, respectively.
Fig. 6. Typical microstructures of FZ of Mg alloy weldments with welding current of 90 A and various ultrasonic vibration power: (a-d) with ultrasonic power of 0, 0.5, 1.0 and 1.5 kW, respectively.
Fig. 7. Typical microstructures of FZ of Mg alloy weldments welded with current of 90 A: (a) without UVA treatment, (b) with UVA treatment (with ultrasonic power of 1.0 kW).
Fig. 8. Typical microshardness distribution of AZ31/MB3 Mg alloy joint with welding current of 90 A and ultrasonic vibration power of 1.0 kW: (a) and (b) MB3 side and AZ31 side of joint along the horizontal direction, (c) along the vertical direction.
UVA parameter (kW) | BM (HV) | HAZ (HV) | FZ (HV) | ||
---|---|---|---|---|---|
AZ31 side | MB3 side | AZ31 side | MB3 side | ||
0 | 56.2 | 57.3 | 47.7 | 48.1 | 51.3 |
0.5 | 56.5 | 57.2 | 47.6 | 48.0 | 52.0 |
1.0 | 56.3 | 57.3 | 48.0 | 48.3 | 53.5 |
1.5 | 56.3 | 57.1 | 47.8 | 48.2 | 53.7 |
Table 3 Average microhardness of AZ31/MB3 Mg alloy joints with welding current of 90 A and various ultrasonic power.
UVA parameter (kW) | BM (HV) | HAZ (HV) | FZ (HV) | ||
---|---|---|---|---|---|
AZ31 side | MB3 side | AZ31 side | MB3 side | ||
0 | 56.2 | 57.3 | 47.7 | 48.1 | 51.3 |
0.5 | 56.5 | 57.2 | 47.6 | 48.0 | 52.0 |
1.0 | 56.3 | 57.3 | 48.0 | 48.3 | 53.5 |
1.5 | 56.3 | 57.1 | 47.8 | 48.2 | 53.7 |
Fig. 9. Bonding strength of Mg alloy weldments: (a) Mg alloy weldments welded under the same current of 90 A and different ultrasonic vibration powers, (b) Mg alloy weldments welded with the ultrasonic power of 1.0 kW and different welding currents.
Fig. 10. Typical fracture characteristics of Mg alloy joints with and without UVA treatment (both with a welding current of 90 A): (a), (c) and (e) without UVA treatment; (b), (d) and (f) with UVA treatment.
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