EXPERIMENTAL STUDY ON POST-ELEVATED TEMPERATURE MECHANICAL PROPERTIES OF BUTT-WELDED CONNECTIONS
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摘要: 对39个对接焊缝连接接头试件进行了高温冷却后的拉伸试验,研究了高温过火对其强度和变形性能的影响规律。试验的主要参数为过火温度和冷却方式,其中过火温度介于200℃~800℃,冷却方式包括自然冷却和泼水冷却。试验结果表明,常温下发生母材塑性破坏的对接焊缝试件,在过火温度较高时全部发生焊缝断裂,试样无明显颈缩,破坏突然;过火温度超过400℃后,冷却方式对对接焊缝连接试件的高温后力学性能有较大影响,自然冷却情况下试件从500℃开始发生焊缝断裂,试件极限强度和极限变形最大降低幅度分别为20%和50%,泼水冷却情况下试件从600℃开始发生焊缝断裂,试件极限强度和极限变形最大降低幅度分别为10%和35%。Abstract: Post-elevated temperature mechanical properties of butt-welded connections were investigated in this study. 39 specimens were heated to different maximum temperature from 200 to 800℃ and held for 60 minutes. They were subsequently cooled to ambient temperature naturally or by water, and finally stretched to failure. Results show that for butt-welded connections that fail in basic metal at room temperature, fracture failure happens, and the failure position changes to the butt weld when the exposed temperature is high. Cooling methods have a great effect on mechanical properties of butt-welded connections after fire when the exposed temperature is above 400℃. For natural cooling, specimens begin to fail in butt weld at a temperature of 500℃, and the maximum decreases in the ultimate strength and the corresponding deformation are 20% and 50%, respectively. For water cooling, specimens begin to fail in butt weld from 600℃, and the maximum decreases in the ultimate strength and deformation are about 10% and 35%, respectively.
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