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The dissimilar galvanized steel sheets with thickness of 0.7 mm St17E and FC180/340HD for car door were tested and studied for laser welding process. The effects of key process parameters (laser power and welding speed) on the weld surface morphology and weld cross section were investigated. The microstructure and mechanical properties of welded joints were analyzed and evaluated. The results indicate that when the laser power and welding speed are 1 300 W and 2.0 m/min respectively, there are less welding spatters and the weld surface is smooth. As the laser power increases and the welding speed decreases, the weld penetration depth and weld area increase. For the dissimilar galvanized steel sheets welded joint, the hardness of the St17E base metal is the lowest, and the hardness of the weld zone is much higher than that of the base metal zone. The tensile specimen of the welded joint obtained with optimized parameters fractures in the St17E base metal.
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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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