移动式钢管"二接一"焊接装置的研制

介绍了在“西气东输”国家重点工程中采用的一种新的钢管对接焊设备和工艺,对长达25m的钢管对焊接过程作了重点介绍了,并对壁厚为14.6mm,直径为1016mm的钢管自动埋弧焊工艺及装备进行了研究,该设备经野外现场使用,焊接质量和效率均比其他设备有较大的提高。     

"西气东输"工程STT根焊工艺

详尽介绍了林肯STT设备参数及调节、”西气东输”管道工程STT根焊焊接工艺及操作技术要点。     

国产管道自动焊技术在"西气东输"工程中的应用

当今的现代化管道工业,从管道的可靠性、经济性以及运行后的使用性能出发,要求管道有较高的输送压力和较大的管线直径,并保证安全运行.西气东输工程的管材材质为X70,管径为φ1 016 mm,输送压力10 MPa,这是现代化管道工业典型的特点,它给管道施工中的焊接提出了更高要求.     

试论"西气东输"工程与我国钢管业发展的方向

面对西部大开发、"西气东输"工程的大机遇、大挑战,探讨了我国钢管业的发展方向。简要介绍了"西气东输"工程概况及对钢管产品的主要要求。提出了以下观点,即大口径螺旋焊管业需要进行重大技术改造,大口径直缝埋弧焊管业应适度发展,高频直缝焊管业要进一步完善和建设 1～ 2套Φ 610mm机组,无缝管业应担当起开发高技术高附加值专用管的重任。     

长输管道焊接施工工艺

焊接施工是长输管道建设过程中重要的环节之一，它制约着管道建设的质量和效率。从工程应用的角度出发，介绍了我国长输管道焊接施工工艺，尤其是根焊工艺的特点，瞻望了管道建设，焊接施工的发展前景。     

西气东输沿线水土腐蚀勘测方法

简要介绍了西气东输工程中水土腐蚀勘测的方法，给出了郑州至郸城高桥段水土腐蚀性勘测结果。     

输弹机液压提升机构H∞鲁棒控制器设计

自行火炮输弹机提升机构将放置在炮车底部的弹丸提升到炮膛高度。针对该系统对运行稳定性的要求以及在运动过程中,系统参数和外干扰会发生变化的特点,设计H∞鲁棒控制器,利用μ综合分析验证加入控制器后系统鲁棒性。仿真和实验表明:加入H∞控制器系统对参数变化和负载变化有很强的鲁棒性,并显著改善了系统对输入信号的跟踪性能。     

西气东输二线用RMD根焊技术

介绍了RMD设备的特点、根焊技术的参数调节、应用参数、易出气孔的原因、焊接工艺和根焊接头分析等.RMD作为一种精确控制下的短路过度技术.能通过检测短路电流发生时间及时改变焊接电流和电压,是一种动态控制技术,可以精确控制熔池.结果表明,该设备操作简便、焊接速度快、根部成形好,对焊接飞溅、热影响区以及平稳过渡的优化都明显强于传统的根焊,在管道全位置焊接中具有较好的应用前景.     

天然气长输管道焊工现场上线考试

介绍了陕一银天然气长输管道7家管道焊接施工单位的149名焊工现场焊接前上线模拟考试情况。     

Development of a protective coating in induction brazing of joints in pipelines in air

Abstract

Flash welding, through conferring a number of important advantages, such as high productivity, good-quality welds, and suitability for welding of components with large cross-sections, is extensively used for shop welding of rails, plating of hot coils, welding of wheel rims, etc.^1–3 More compact welding facilities are also being sought through further exploitation of mechanical control technology for practical applications in job-site welding of rails, H-steel sections, etc.⁴     

OTSInca在钢铁非金属夹杂物检测中的应用

从系统组成、工作原理、功能介绍和特殊优势等4个方面详细介绍了一款钢铁非金属夹杂物自动分析系统-OTSInca软件。该软件功能强大、操作便捷，可以自动、高效、准确地表征非金属夹杂物的分布、成分和形态信息，结合其强大的数据库系统，可以自动识别出非金属夹杂物的种类。同时，该系统在操作界面、数据采集、数据库、报告输出等4个方面具有独特的优势，也极大地提高了非金属夹杂物自动识别的效率和准确性。     

The measurement of forces in grinding in the presence of vibration

Most investigations of chatter have made the assumption that torsional vibration is not a significant factor. Some recent work has shown that chatter in grinding is affected by a change in the torsional stiffness of the workpiece drive. Also, a theoretical model of grinding chatter has been developed that confirmed the significance of torsional effects. However, the model for the grinding force was assumed to be a dynamic equivalent of a published steady-state model. This paper describes tests conducted to measure the variation in force caused by an oscillation in workpiece speed. The oscillating test results indicate that the torsional vibration of the workpiece may well be a significant effect on chatter in grinding. Moreover, as the grinding force changes with workpiece speed, it may be possible to use variation of workpiece speed at high frequency to reduce chatter.     

Behaviour of Zinc in Sea Water in the Presence of Sulphides

Abstract

The effect of sulphides on the corrosion of zinc in artificial sea water has been studied over the pH range 6·5 to 8·6. A comparison of the weight loss and potential values of specimens in aerated and deaerated sea water, with or without the addition of sulphide, has shown that at pH values > 7·2 the presence of sulphides increases the corrosion, while at lower pH values it is partially inhibited. This is related to changes in the concentration of S^2- ions in the solution. The corrosion products formed in the more corrosive solutions were shown to consist mainly of ZnS, which is believed to cause loss of adhesion of the corrosion products on the zinc surface, and thus to accelerate the corrosion.     

Examination of negative factors of radiation in arc welding in shipbuilding

The effect of anomalies detected in x-ray diffraction and metallographic examination of welded joints on the properties of resistance butt welded joints in 1201 aluminium alloy is determined and recommendations are given for the standards for permissible defects.     

Directions in rationalization of the use of energy in heat treatment of metals

Conclusions The world energy crisis must not cause limitations to the development of industrial production and in particular it must not decrease the rate of development of heat treatment but must stimulate rationalization of the energy consumption of heating operations.Heat treatment, which is by nature an energy consuming operation, is simultaneously an energy saving one. This energy paradox is the result of the dissimilar requirement of energy in the production of steel and in its heat treatment, the reason for which is the fact that from the energy point of view heat treatment is several times more economical than the production and use of steel without heat treatment. As the result of this, to decrease the energy consumption of the economy of each country as a whole it is necessary to use heat treatment of metallic materials in industry on the widest possible scale.There exist large possibilities for decreasing energy consumption in the heat-treatment industry. The simplest form of economy in energy in heat treatment of metals is a decrease in its consumption without additional capital expenditures by improvement in the organization of production. More complex and requiring a longer time is the use of new production operations and equipment. The combined use of these reserves must provide a decrease in energy consumption in heat treatment of at least more than 10%.Presented at the All-Union Conference on "Economy in Metal and Energy on the Basis of the Introduction of Progressive Methods of Heat and Chemicothermal Treatment" held in Penza on May 16–18, 1984.Institute of Precision Mechanics, Polish Peoples Republic. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 17–24, March, 1985.     

磁场参数对堆焊层稀释率的影响

稀释率的大小影响着堆焊层的组织与性能,它是评价堆焊层质量的重要参数。本文研究了不同磁场参数作用下对堆焊层稀释率的影响,并探讨了影响稀释率的机理。实验结果表明,激磁电流在1.5A,磁场频率在10Hz时,稀释率从63.5%下降到了42.2%,有利于得到低稀释率和高质量的堆焊层。