排序方式: 共有6条查询结果,搜索用时 46 毫秒
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研究了高强度耐磨钢板NR360的焊接接头组织和力学性能,结果表明,焊缝组织主要为块状或针状铁素体,热影响区组织分布比较均匀,主要为细小板条贝氏体与少量马氏体,熔合区结合良好。热影响区和NR360钢板本体硬度相近。NR360耐磨钢板焊接接头具有良好的强韧性。 相似文献
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Chemical studies of anthocyanins: A review 总被引:10,自引:0,他引:10
Araceli Castañeda-Ovando Ma. de Lourdes Pacheco-Hernández Ma. Elena Páez-Hernández José A. Rodríguez Carlos Andrés Galán-Vidal 《Food chemistry》2009
Anthocyanins are natural colorants which have raised a growing interest due to their extensive range of colours, innocuous and beneficial health effects. Despite the great potential of application that anthocyanins represent for food, pharmaceutical and cosmetic industries, their use has been limited because of their relative instability and low extraction percentages. Currently, most investigations on anthocyanins are focused on solving these problems, as well as their purification and identification. 相似文献
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手工电弧焊电压控制的研究 总被引:1,自引:0,他引:1
手工电弧焊的电弧电压是一个难以控制的参数,有时能对焊接质量产生较大影响。当电弧电压高于设定值时,通过焊接电源外特性曲线的转换,使电流从焊接电源跳变到较小电流,由此通知操作者去调节弧长,从而把电弧电压维持在设定值之下。 相似文献
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介绍了一种新型的XH—4×300A型微机直接数字控制(DDC)智能四工位手工弧焊机。文中阐述了该机的基本结构、原理和系统的控制方法,并详细列举了由于微机的应用,使该机具有的优异性能和独有的特色。同时还对微机应用于一般焊接设备的趋势作了评估。 相似文献
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