發(fā)布時間：2018-12-06 07:13

【摘要】：管道閃光對焊是一種先進的焊接方法,焊接工藝參數(shù)易于控制與調整,以其不用填絲、自動化程度高、工藝穩(wěn)定、焊接質量好等優(yōu)點在國外尤其是在烏克蘭和俄羅斯得到了廣泛應用,并且在軌道建設、油氣輸送、石油化工、航空航天、能源電力、造船及海洋工程等領域具有廣闊的應用前景。雖然該技術具有諸多優(yōu)點,但是管道閃光對焊焊后焊縫表面毛刺如何去除是制約管道閃光對焊技術推廣應用的一個技術瓶頸。據(jù)此,本文介紹了一套運用等離子技術修整管道閃光對焊焊后焊縫外壁毛刺的等離子毛刺去除系統(tǒng),通過與管道閃光焊接設備K584Ch的配套使用,能有效地對閃光焊接后的管道外部毛刺進行清理,因此全面了解運用等離子技術修整焊縫對接頭組織與力學性能的影響顯得尤為必要。本文首先針對K584Ch管道閃光對焊設備研發(fā)了一套與其配套使用的等離子毛刺去除系統(tǒng),根據(jù)功能要求設計出相應的結構并在UG軟件中進行三維零件建模并裝配,裝配完后將其導入ADAMS軟件中進行運動學的分析和仿真,進一步驗證該設備的機械結構合理,不存在機構干涉現(xiàn)象。接著將其加工成實體模型,通過設備的調試可以實現(xiàn)在閃光對焊后對管道外部焊縫毛刺進行清理。本文接著對X65管線鋼焊接接頭進行了單因素試驗來探究最優(yōu)的等離子毛刺去除工藝參數(shù),總共設置了三組試驗,每組所選用的X65管線鋼用相同的焊接參數(shù)在管道閃光焊機上焊接后分別用50 A、60 A、70 A的等離子電源電流I進行毛刺去除,其它等離子去除毛刺的工藝參數(shù)保持一致,最后通過組織結構與力學性能的檢測與分析得到最優(yōu)的等離子毛刺去除電流。本文最后基于最優(yōu)的等離子毛刺去除參數(shù)探究了等離子毛刺去除對接頭組織與力學性能的影響,主要對X65管線鋼焊接接頭進行了等離子清渣與機加工清渣處理,接著進行了室溫力學性能的試驗研究主要包括拉伸與彎曲試驗,獲得了等離子清渣與機加工清渣焊接接頭的室溫力學性能,并且對等離子清渣與機加工清渣接頭微觀組織形貌進行了分析,最后得出相應的結論。
[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.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG457.6

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本文編號：2365643