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Outline
To meet the requirements for vehicle lightweighting, resistance element welding (REW) is performed on a die-cast magnesium alloy and a steel plate using steel rivets. Under constant heat input, different magnesium/steel REW joints are produced by adjusting the welding current and welding time. The macrostructure, microstructure, mechanical properties, and fracture morphologies of the joints are observed and analyzed. The results show that, under constant heat input, heat is transferred from the surface of the electrode cap toward its interior; as the welding time decreases, the through-thickness integral nugget transforms into two fan-shaped nuggets in the upper and lower regions. With increasing welding current, the length of the gap extending along the interface and the distribution length of the eutectic phase at the nugget edge between the steel rivet and the lower steel sheet decrease. Under constant heat input, as the welding current increases and the welding time decreases, the shear resistance initially decreases and then increases, reaching a maximum shear resistance of 6.37 kN; the effective shear displacement increases with increasing welding current, reaching a maximum effective shear displacement of 4.56 mm.
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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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