Abstract
Magnesium (Mg) alloys have high specific strength and are widely employed in aerospace and automotive industries. Gas tungsten arc welding (GTAW) is an important method for welding and repairing magnesium alloys. However, magnesium alloys have high hot cracking sensitivity during welding, especially in the Mg-aluminum (Al) alloys with high Al contents. In this study, the application and mechanism of ultrasonic-assisted gas tungsten arc welding (U-GTAW) in reducing the susceptibility of hot cracks in magnesium alloys during welding were discussed. The results showed that the crack rate, grain size, and β-phase size decreased as the ultrasonic amplitude increased. The crack initiation process, crack tip morphology, and crack fracture morphology were observed. Ultrasonic cavitation, acoustic flow, and ultrasonic capillary effect would result in decrease grain size, fine dispersion of the β-phase and improve the healing ability of liquid phase. With the increase of ultrasonic amplitude, the hot crack sensitivity of U-GTAW decreased.
| Original language | English |
|---|---|
| Pages (from-to) | 254-262 |
| Number of pages | 9 |
| Journal | Materials and Manufacturing Processes |
| Volume | 40 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2025 |
Keywords
- Crack
- GTAW
- Houldcroft
- amplitude
- magnesium
- ultrasonic
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