共查询到20条相似文献,搜索用时 125 毫秒
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分析了350 mm轧机辊缝压下系统缺陷,介绍了优化方案、实施措施及现场运行情况。通过解决密封问题、润滑问题,以及更换定位套材质,保证了辊缝调整系统稳定运行。 相似文献
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韩道永 《机械工人(热加工)》2010,(24):39-40
本文介绍了CO2气体保护焊在宁夏贺兰山风电场塔架制作过程中,根据焊接工艺评定,制定焊接工艺规程,对塔架筒体纵缝、环缝焊接缺陷进行了成功的补焊,经检验合格并取得了较好的经济效益。 相似文献
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李宇顺 《机械工人(热加工)》2008,(20):59-61
介绍了激光加工防砂割缝管的原理,以及利用数控机床激光割缝管的原理,分析了激光切割筛管过程中常见的质量缺陷及产生的原因,并提出了工艺解决方案。 相似文献
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合成第一废热锅炉管板缺陷分析及修复 总被引:1,自引:0,他引:1
合成车间第一废热锅炉在使用过程中管板出现管孔焊肉被冲蚀及管桥裂纹等缺陷。通过分析其工艺特性及介质流动情况对该缺陷进行了处理,取得了很好的效果。 相似文献
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焊缝在整个管网系统中是比较薄弱的部分,在温度、压力、介质腐蚀和振动的影响下容易出现裂纹缺陷,对管道的安全运行产生危害,并且有的裂纹很小,通过超声导波不容易直接识别出来.对超声导波检测管道进行了研究,在分析了超声导波对焊缝小缺陷的检测后,提出了一种运用时间反转法基于L(0,2)模态超声导波进行数值模拟的方法,选择4%作为... 相似文献
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折臂式随车起重机六边形吊臂结构的发展 总被引:1,自引:0,他引:1
折臂式随车起重机吊臂型式大多是六边形的.国内早期较常见的这种六边形吊臂的结构型式有4焊缝结构和2焊缝结构,这两种结构必须分别由4条焊缝和2条焊缝进行结构连接.随着随车起重机的发展,近几年出现了一种较新型的1条焊缝的六边形吊臂结构.对这几种结构型式吊臂的特点进行了分析和介绍. 相似文献
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Expandable profile liner(EPL) is a promising new oil well casing cementing technique, and welding is a major EPLs connection technology. Connection of EPL is still in the stage of manual welding so far, automatic welding technology is a hotspot of EPL which is one of the key technologies to be solved. A robot for automatic welding of"8" type EPL is studied. Four quadrants of mathematical equations of the 8-shaped cross-section track of EPL, consisting of multiple arcs, are established. Mechanism program for complex cross-section welding of EPL based on angle detection is proposed according to characteristics of small size, small valleys, and large forming errors, etc. A welding velocity vector control model is established by linkage control of a welding vehicle, a small driven actuator, and a height tracking mechanism. A constant speed control model based on an angle and symmetrical analysis model of rectangular coordinate system for EPL is built. Constraint conditions of constant speed control between each section are analyzed with 4 sections in first quadrant as an example, and cooperation work mechanism of the welding vehicle and the small tracking actuator is established based on pressure detection. The constant speed control model using angle self-test can be used to avoid the need for a precise mathematical model for tracking control and to adapt manufacture and installation deviation of EPL workpiece. The model is able to solve constant speed and trajectory tracking problems of EPL cross-section welding. EPL seams welded by the studied robot are good in appearance, and non-destructive testing(NDT) shows the seams are good in quality with no welding defects. Bulge tests show that the maximum pressure of welded EPL is 35 MPa, which can fulfill expansion performance requirements. 相似文献
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堵孔板外围的封闭焊缝由于受到较大的约束,因此会在焊缝和堵孔板内产生很大的内应力。研究了结构补强中的由堵孔板封闭焊缝引起的应力的分布规律,并对在堵孔板中开设应力释放孔以减小焊缝处应力的规律进行了研究。 相似文献
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HG70板盒型承载结构件结构复杂,加强筋多,焊缝交错,焊接过程中变形大,位置尺寸要求严格,各连接孔较深,加工难度大。由于HG70板材料的特殊性,焊后不允许热校形,而机械的校形方法时焊缝的影响较大,使得一般的工艺加工方法很难满足其性能要求。本文通过对影响焊接变形的几个因素进行详细的分析,选择合理的焊接方法、焊接参数,采取有效的加工措施,通过试验,不断进行验证,圆满地解决了这一难题。此工艺方案完全适用于类似HG70板盒型承载结构件的加工。 相似文献
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A. S. Shleenkov O. A. Bulychev S. A. Shleenkov L. A. Polezhaev D. S. Panov P. G. Khudyakov 《Russian Journal of Nondestructive Testing》2013,49(5):251-259
An optimum block-schematic diagram and the distinctive features of a novel automated device that corresponds to modern requirements for the magnetic defectoscopy of the weld seams and heat-affected zones of electrically welded pipes that are 168–530 mm in diameter in the flow of their production are considered. It is shown that the application of computer technologies and thin-film transducers with high resolution allows one to substantially increase the functional possibilities of a defectoscope and provides the detection of not only defects of the type of metal discontinuities and edge displacements, but also defects that are caused by the violation of welding modes resulting in the burn and edge-cling defect types in the area of a weld seam. 相似文献