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To study the effects of welding parameters on the tolerance of friction stir welding (FSW) of dissimilar aluminum alloys, the mechanical properties and structure of joint of dissimilar aluminum alloys (A356 and AA6061) by FSW under different welding parameters were studied by means of micro-hardness testing, tensile mechanical properties testing, scanning electron microscopy among other analytical testing means. The results show that as for the workpieces with the gap from 0 mm to 1 mm, the welded joint has tensile strength decreased significantly and presents visible welding defects. With tool pin of the same specification, the material flow can be promoted by decreasing the welding speed from 120 mm/min to 80 mm/min, thus the tolerance of workpiece gap will be greatly improved. The tool pin with diameter increased from 4 mm to 6 mm can lead to higher tolerance for welding, but also the material with a higher fusion degree and without delamination.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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