Abstract
Friction stir welding (FSW) joints of AA1050 under various ratios of rotational speed to welding speed (ω/v) were studied. The effects of ω/v on surface appearance, hardness distribution, stress-strain curve and microstructures of the joints were investigated. The results show that fine surface appearance of welded joints can be obtained when ω/v is 800/100, 1 000/200 and 1 400/300. Vickers hardness of stir zone (SZ) is higher than that of base metal (BM) and the highest average Vickers hardness is 42.9. The tensile strength of SZ is also higher than that of BM and the highest ultimate tensile strength (UTS) increase by 64%, up to 105 MPa. At a constant rotation speed, the tensile strength of SZ increases while its ductility decreases with the increase of the welding speed. The welded joint with both good mechanical property and high work-hardening capacity can be obtained when ω/v is 1 400/300. The points corresponding to high welding quality distribute near the inflexion of the curve of yield strength versus heat input.
| Translated title of the contribution | Quality and mechanical property of aluminum joints after friction stir welding |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 2677-2683 |
| Number of pages | 7 |
| Journal | Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) |
| Volume | 49 |
| Issue number | 11 |
| DOIs | |
| State | Published - 26 Nov 2018 |
| Externally published | Yes |