排序方式: 共有98条查询结果,搜索用时 15 毫秒
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通过室温和高温拉伸性能测试研究焊后热处理和同步预热对Ti-23Al-17Nb(原子分数,下同)合金CO_2激光焊接接头性能的影响.结果表明,接头室温和高温拉伸性能低,焊后真空热处理提高接头室温和高温拉伸性能,仍低于母材;同步预热接头室温强度和塑性与母材相当,高温强度与焊后热处理效果相当.组织分析显示,焊缝存在两个腐蚀衬度区,组织为B2相,热影响区晶粒由熔合线到母材逐渐细化,焊后热处理和同步预热改变β相基体上α2相的析出. 相似文献
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应用自行研制的多通道信号传感系统,实时采集可听声、蓝紫光以及红外辐射等三路信号.设计了楔形板焊接和阶梯板焊接两组试验,并采用RMS平滑、STFT分析和特征频段信号提取等手段分析信号.结果表明,可听声和蓝紫光信号RMS值和2 000~3 500 Hz频段信号幅值,在过熔透时极低,在完全熔透时很高,在未熔透时介于两者之间,三种熔透状态分界线明显,不稳定熔透时,三路信号波动较大,信号值比完全熔透时略低.可最终实现四种熔透状态的识别. 相似文献
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Two measuring methods, high-speed camera and optical monitoring system, were used to study processes of laser welding. Molten pool, cooling time and temperature field were analyzed based on real measured images and optical signal data. The results show that the width of molten pool is almost equal to the width of weld, and length is about 7. 8 mm. The solidification time is about 0. 5 s and the temperature gradient is great, so HAZ is very small. The method and results will be of benefit to build the relationship between welding parameters and microstructure. 相似文献
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为了克服激光深熔焊易产生气孔、焊接高碳钢高合金钢等材料时接头组织性能恶化并容易出现裂纹以及材料对激光吸收率低等缺点,研究了一种将高频感应加热与激光相结合的复合焊接方法。以30CrMnSiA为对象,与激光焊接相比,采用激光高频感应复合焊的焊缝组织中马氏体成分减少,贝氏体成分增加,接头的裂纹倾向降低了,同时焊缝的熔深熔宽也有明显的提高,而并未使焊接热影响区变宽或组织恶化。实验结果表明,激光高频感应复合焊接与单纯激光焊接相比,可以起到改善接头组织性能、降低裂纹和气孔倾向以及进一步提高焊接效率的效果。 相似文献
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