共查询到18条相似文献,搜索用时 93 毫秒
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宝钢集团八钢公司冷轧薄板酸洗线的闪光焊机的问题严重影响了产线的产能和质量,同时焊接后的焊缝光整后平整度不高,对酸洗胶面辊辊面损伤严重,造成成本较高。所以对闪光焊机进行了改进,使其达到了使用要求。 相似文献
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本文分析了影响焊接质量的因素,提出提高"一次焊接成功率"的目标,通过分析,找出了焊缝不稳定的原因,并提出了相应的措施,从而使焊机"焊接成功率"大幅提高,为酸洗和轧机提速创造条件。 相似文献
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介绍电阻缝焊机的焊接原理,焊缝形成的过程以及影响焊缝质量的主要因素,例如焊接电流、焊接时间、接触电阻等;介绍了VAICLECIM公司生产的MINILAP电阻窄搭接缝焊机的性能结构,并针对镀锌线应用中出现的问题进行分析,查找原因,制定措施,更好地指导焊机的操作和维护。 相似文献
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在酸洗机组和冷连轧机组上,闪光对焊作为一种有效的焊接方法得到了较为广泛的应用。宝钢1 220 mm轧机应用三菱公司NMW-C750F闪光焊机对轧钢坯料带钢前后端部采用闪光对焊工艺焊接。从来料、设备、工艺等方面详细分析了影响闪光对焊焊缝质量的因素,并根据冷连轧机组现场实际情况制定了一系列焊接工艺调整、备件周期维护等措施,有效地提高了轧钢中闪光对焊的焊接质量和可靠性,保证了1 220 mm轧机的正常运行。 相似文献
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攀钢冷轧薄板厂2释热镀铝锌生产线,采用法国克莱西姆(CLECIM)公司的窄搭接电阻滚压焊机。该焊机是为了实现连续生产对前、后卷带钢进行焊接。本文重点阐述了该焊机的焊接质量热态控制系统的原理及特点。通过该项技术的应用,避免了焊缝因温度而导致的未焊透或烧穿等焊接缺陷,保证了焊接质量,有效地提高了产品的成品率,减少了断带次数。 相似文献
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使用窄搭接焊机焊接1 500 MPa级热成型钢时,因碳当量较大,焊缝处容易发生脆断问题。通过对焊缝进行金相检测及电镜观测,分析焊缝缺陷,并相应地调整焊接参数,从而得到良好的焊接质量。在对厚规格980 MPa级双相钢进行自身焊接时,焊缝会偶发开裂问题,使得产线无法实现稳定运行,通过采用碳当量较低的普材跟厚规格980 MPa级双相钢交替焊接,焊接质量良好。通过总结这两种高强钢的焊接经验,举一反三,将其应用到其他高强钢种的焊接上,提高了窄搭接焊机焊接高强钢的稳定性,避免了带钢因焊缝焊接质量差而发生断带的风险,从而保障了高强钢的稳定生产。 相似文献
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焊机是钢厂连续退火机组的关键设备之一,焊缝质量直接关系到机组产品的表面质量、通板能力和工作辊的辊耗。焊机监控系统是焊机的辅助系统,用于监控焊缝质量。宝钢某连续退火机组原有焊机监控系统是基于DOS的16位程序,而且不能在焊机旁直接观察监视焊缝温度等关系焊缝质量的曲线,这与连退机组领先的工艺水平和快节奏生产不协调。现对焊机监控系统进行了改进,完善了原有焊机监视系统的功能,使操作人员能及时了解机组的状态、焊接的质量,确保生产正常。在实际应用中获得了较好效果。 相似文献
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攀钢冷轧薄板厂2#热镀铝锌生产线采用法国克莱西姆(CLECIM)公司的窄搭接电阻滚压焊机.该焊机是为了实现连续生产对前、后卷带钢进行焊接.重点阐述了该焊机的焊接质量热态控制系统的原理及特点,通过该项技术的应用,避免了焊缝因温度而导致的未焊透或烧穿等焊接缺陷,保证了焊接质量,有效地提高了产品的成品率,减少了断带次数. 相似文献
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冷轧厂2005年底在轧机生产线引进了具有世界先进水平的激光焊机及其焊缝检测系统。从来料板形(记录为高度差曲线)、钢种、热透镜效应等方面分析了实际焊机应用中影响焊接质量的因素。试验及讨论表明:板形对激光焊机的焊接质量有显著影响;不同钢种需要细化焊接参数;热透镜效应直接影响激光聚焦从而影响焊接质量。实施了板形改善、优化参数、改用氮气作为保护气体等解决方案,确保了焊接质量的稳定可靠,从而提高了生产效率。 相似文献
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首钢京唐2 230冷轧分厂引进德国米巴赫CSLH21型激光焊机,分别用于冷硬卷带钢的焊接,可焊接带钢宽度范围为800~2 150 mm、厚度范围为0.4~2.5 mm的低碳钢、高碳钢、双相钢等多种钢种。主要介绍连续退火生产线(连退线)激光焊机双切剪精度缺失对焊缝质量的影响,通过对焊机剪切精度进行多方位调整,恢复了剪切精度,极大改善了焊接质量,降低了冷轧厂连退线激光焊机的重焊率及停车率。 相似文献
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米巴赫激光焊机是实现冷轧带钢厂的各条生产线连续生产的关键设备之一,它具备其他焊接方法无法比拟的优越性,能够显著提高轧制和焊缝的可靠性以及降低断带率。带钢激光焊接质量主要取决于焊接速度、焊接功率、离焦量(FOCUS)、工作头压力、操作侧驱动侧间隙(GAP)、二次剪切、预加热和后退火等主要参数和功能的控制精度。以首钢京唐二冷轧酸轧生产线的米巴赫激光焊机为研究对象,结合QCDS焊缝检测系统的有效使用,总结提出通过提高激光焊机设备功能精度保证焊缝质量的系列维护技术措施,明确了焊机使用维护中的关键点和技术规程,并取得显著应用效果。研究可为其他机组快速诊断由于设备功能精度引起的焊缝质量不良的原因提供参考。 相似文献
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阐述了马钢冷轧板厂酸洗连轧线入口段主线PLC控制的难点部分与焊机的接口,介绍了试生产过程中遇到的带头在焊机处的定位问题,分析了带头进焊机不到位问题的原因及解决方法。 相似文献
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Vikas Kumar S. K. Albert N. Chandrasekhar J. Jayapandian 《Transactions of the Indian Institute of Metals》2018,71(12):3063-3075
Shielded metal arc welding (SMAW) and metal inert gas (GMAW) welding process are the two most widely used welding processes. These processes are widely used for the construction and fabrication purpose in almost all type of industries. Some of the important factors which govern the weld quality in these welding processes are welding power sources, role of shielding gas (for GMAW process), welding consumables and skill of the welders. Currently, effects of these factors are evaluated by examining the quality of the weld produced and not by monitoring how welding process is affected by change in these factors. This is an indirect method because actual contribution made by individual parameter in physical process is effectively ignored. Further, this is expensive and time-consuming as the assessment can be carried out only after the weld is completed. Hence, a procedure to assess the quality of welding process using the data acquired while welding is in progress is preferred to testing of the weld for this purpose. In both SMAW and GMAW processes, welding speed, voltage and current are important parameters that affect the quality of the welds. Among these, monitoring of welding speed is relatively easy; but monitoring voltage and current is not. This is because, welding is a stochastic process in which wide variation in voltage and current occurs and duration of these variations is so short that they are not observed in the voltage and current displayed in the power source. However, with the help of a high-speed data acquisition system, voltage and current variations during actual welding process can be recorded and subsequently analysed to reveal very useful information on the welding process, and subsequently quality analysis of individual welding parameters can also be done. In the present study, the voltage and current signals acquired using a digital storage oscilloscope have been used to study SMAW and GMAW processes. Data was acquired for duration of 20 s at a sampling rate of 100,000 samples/s while welding is in progress. In the case of SMAW process, welding data was acquired for welds made using different welding power sources, but with same welder and same type of electrode. In the case of GMAW process, welds were made using same wire and same welder but with different gases for shielding and at different set currents. Dynamic variation in the voltage and current signals were carefully studied using time domain and statistical analyses. Results showed that differences in the characteristics of the different power sources used for SMAW process and effect of shielding gases and arc current on GMAW process could be easily revealed by such analysis. For SMAW process, results obtained could also be correlated with the appearance of the weld beads. Hence, a procedure involving high-speed data acquisition of voltage and current signal while welding is in progress and the statistical analysis of the acquired data have been proposed for monitoring of these two arc welding processes. 相似文献
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