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In this paper, the mechanical properties and metallographic structure of the joint with different welding technologies are compared and analyzed with the theoretical calculations of crack sensitivity index and preheating temperature as well as the methods of inclined Y-groove welding crack sensitivity test combining with operative weldability test of steel plate. Moreover, the JM-100 welding wire and 80%Ar+20%CO2 argon-rich gas are determined to be adopted for welding the Q550D steel plate with thickness of 20 mm. The crack sensitivity index is 0.28, minimum preheating temperature is 13 ℃ and preheating treatment is not needed during welding. The welding heat input is controlled at 9.0~24.8 kJ/cm, temperature between weld passes is controlled below 200 ℃, mechanical properties of joint reach the best and there are no coarse and abnormal structures in weld seam and heat affected zone.
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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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