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Outline
To investigate the properties of laser spiral spot welded joints of galvanized steel sheets with different spiral trajectory diameters, experiments were carried out on two lap joint configurations: a 0.7 mm and 2.5 mm large thickness ratio lap joint of galvanized steel sheets, and a three-layer thin galvanized steel sheet assembly with a thickness of 0.7 mm. For each configuration, three groups of tests were designed, including resistance spot welding and laser spiral spot welding with spiral trajectory diameters of 6 mm and 8 mm, respectively. After welding, the welded joints were analyzed from the perspectives of macro-appearance, metallographic microstructure and shear mechanical properties, so as to study the differences of laser spiral spot welded joints under different spiral diameters. The results show that the surface quality of laser spiral spot welded joints is relatively poor, and there is no significant difference in the surface quality of laser spot welded joints with different spiral trajectory diameters. However, the shear resistance and energy absorption capacity of the welded joints are significantly enhanced with the increase of laser spiral trajectory diameter, which proves that the spiral trajectory diameter has a great influence on the mechanical properties of the welded joints. Compared with resistance spot welding, laser spiral spot welding is superior in plastic deformation capacity and energy absorption performance.
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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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