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Welding tests are carried out on flat copper wires for stator of new energy vehicles’ drive motors by using two processes, ring spot laser welding and TIG welding. Moreover, the welding process and the performance of the joints are investigated and analyzed. The results show that the optimal process of flat copper wire laser welding is 2 500 W for the center core power, 1 500 W for the ring core power, 290 mm/s for the welding speed, and +5 mm for the defocusing amount, and the obtained joints are well formed without weld defects such as pores, etc.; the optimal process parameters of TIG welding are 140 A for the welding current, 150 mm/s for the welding speed, and a small amount of shrinkage holes exists in the obtained joints. The maximum shear strength of the joint obtained by the ring spot laser welding process is 132 MPa, and the maximum hardness of the joint appears in the center of the weld, which is about 140 HV0.2; while the maximum shear strength obtained by TIG welding is 110 MPa, and the maximum hardness of the joint appears in the center of the weld, which is about 128 HV0.2. The welded joints obtained by ring spot laser welding are better than the TIG welded joints in the organization, morphology, and mechanical properties, and they are more suitable for the welding of flat copper wire.
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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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