管道闪光对焊等离子修整工艺开发及性能研究

发布时间：2018-12-06 07:13

【摘要】：管道闪光对焊是一种先进的焊接方法,焊接工艺参数易于控制与调整,以其不用填丝、自动化程度高、工艺稳定、焊接质量好等优点在国外尤其是在乌克兰和俄罗斯得到了广泛应用,并且在轨道建设、油气输送、石油化工、航空航天、能源电力、造船及海洋工程等领域具有广阔的应用前景。虽然该技术具有诸多优点,但是管道闪光对焊焊后焊缝表面毛刺如何去除是制约管道闪光对焊技术推广应用的一个技术瓶颈。据此,本文介绍了一套运用等离子技术修整管道闪光对焊焊后焊缝外壁毛刺的等离子毛刺去除系统,通过与管道闪光焊接设备K584Ch的配套使用,能有效地对闪光焊接后的管道外部毛刺进行清理,因此全面了解运用等离子技术修整焊缝对接头组织与力学性能的影响显得尤为必要。本文首先针对K584Ch管道闪光对焊设备研发了一套与其配套使用的等离子毛刺去除系统,根据功能要求设计出相应的结构并在UG软件中进行三维零件建模并装配,装配完后将其导入ADAMS软件中进行运动学的分析和仿真,进一步验证该设备的机械结构合理,不存在机构干涉现象。接着将其加工成实体模型,通过设备的调试可以实现在闪光对焊后对管道外部焊缝毛刺进行清理。本文接着对X65管线钢焊接接头进行了单因素试验来探究最优的等离子毛刺去除工艺参数,总共设置了三组试验,每组所选用的X65管线钢用相同的焊接参数在管道闪光焊机上焊接后分别用50 A、60 A、70 A的等离子电源电流I进行毛刺去除,其它等离子去除毛刺的工艺参数保持一致,最后通过组织结构与力学性能的检测与分析得到最优的等离子毛刺去除电流。本文最后基于最优的等离子毛刺去除参数探究了等离子毛刺去除对接头组织与力学性能的影响,主要对X65管线钢焊接接头进行了等离子清渣与机加工清渣处理,接着进行了室温力学性能的试验研究主要包括拉伸与弯曲试验,获得了等离子清渣与机加工清渣焊接接头的室温力学性能,并且对等离子清渣与机加工清渣接头微观组织形貌进行了分析,最后得出相应的结论。
[Abstract]:Pipeline flash butt welding is an advanced welding method. The welding process parameters are easy to control and adjust. The advantages of good welding quality have been widely used abroad, especially in Ukraine and Russia, and have been widely used in orbit construction, oil and gas transportation, petrochemical, aerospace, energy and electricity, Shipbuilding and marine engineering have broad application prospects. Although this technology has many advantages, how to remove the burr of weld surface after pipeline flash butt welding is a technical bottleneck that restricts the popularization and application of pipeline flash butt welding technology. Based on this, this paper introduces a plasma burr removal system which uses plasma technology to repair the outer wall burr of the weld seam after flash butt welding of pipeline. The system is used in conjunction with the K584Ch equipment for pipeline flash welding. The external burr of the pipe after flash welding can be cleaned effectively, so it is necessary to understand the effect of plasma technology on the microstructure and mechanical properties of the welded joint. In this paper, a plasma burr removal system is developed for K584Ch pipeline flash butt welding equipment. According to the functional requirements, the corresponding structure is designed and the 3D parts are modeled and assembled in UG software. After assembly, it is introduced into ADAMS software for kinematics analysis and simulation. It is further verified that the mechanical structure of the equipment is reasonable and there is no mechanism interference phenomenon. Then it is machined into a solid model, and through the debugging of the equipment, the burr of the outer weld seam of the pipeline can be cleaned after flash butt welding. In this paper, a single factor test on the welded joint of X65 pipeline steel is carried out to find out the optimal parameters of plasma burr removal. The X65 pipeline steel selected for each group was welded on the pipe flash welding machine with the same welding parameters. After welding on the pipe flash welding machine, the burr was removed with the plasma power current I of 50Am 60A / 70A, respectively, and the other process parameters of the plasma burr removal remained the same. Finally, the optimal plasma burr removal current is obtained by the detection and analysis of the structure and mechanical properties. Finally, based on the optimal parameters of plasma burr removal, the effect of plasma burr removal on the microstructure and mechanical properties of the joints is discussed. The plasma slag removal and machining slag removal are mainly carried out for the welded joints of X65 pipeline steel. Then, the mechanical properties at room temperature are studied, including tensile and bending tests, and the mechanical properties of plasma slag cleaning and machined slag cleaning welded joints at room temperature are obtained. The microstructure of plasma slag cleaning joint and machining slag cleaning joint was analyzed, and the corresponding conclusions were obtained.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG457.6

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