Full
Outline
To promote the further application of high-strength aluminum alloys in the aviation field，the 7050-T7451 aluminum alloy with 4 mm thickness is carried out by laser-melt inert-gas（MIG）hybrid welding. The results show that a well-formed weld seam can be obtained with reasonable matching of welding parameters，while welding at higher speeds is easy to produce cracks. When the welding speed is controlled at 0.9 m/min or below，and the weld back-width ratio is controlled above 0.4，the cracks and porosity defects can be effectively suppressed. The weld zone is mainly composed of equiaxed grain structures with significant differences in size. Near the fusion zone，there is a fine-grained layer approximately 20-50 μm wide，and only a minimal amount of columnar grains forms adjacent to this fine-grained layer. No phase transformation or recrystallization occurs in the heat-affected zone. The as-welded joint achieves an average tensile strength of approximately 377 MPa， equivalent to about 73% of the base metal strength， significantly outperforming the tensile properties of laser self-fusion welded joints.
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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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