کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
831367 | 1470366 | 2011 | 6 صفحه PDF | دانلود رایگان |
A 2219-T6 aluminum alloy was underwater friction stir welded at a fixed welding speed and various rotation speeds in order to illuminate the influence of rotation speed on the performance of underwater joints. With increasing rotation speed, the hardness of the stir zone (SZ) gradually increases due to the increase in dislocation density. The tensile strength first increases from 600 to 800 rpm and then reaches a plateau in a wide rotation speed range. After that a remarkable decrease in tensile strength occurs owing to the formation of void defect. The joint welded at lower rotation speed tends to be fractured in the SZ. At higher rotation speeds, the hardness increase in the SZ makes the fracture locations of defect-free joints move to the thermal-mechanically affected zone (TMAZ) or heat affected zone (HAZ).
► Underwater FSW of 2219-T6 aluminum alloy has been successfully conducted.
► Too low or too high rotation speed can both yield poor mechanical properties.
► Good-quality underwater joints can be produced under a wide rotation speed range.
► The fracture features of underwater joints largely depend on the rotation speed.
Journal: Materials & Design - Volume 32, Issues 8–9, September 2011, Pages 4402–4407