【作者】 焦方龙；

【导师】 常云龙；

【作者基本信息】 沈阳工业大学 ， 材料加工工程， 2010， 硕士

【摘要】 氩弧焊在焊接领域中应用的较为广泛,为了提高焊接质量及焊接生产率,人们在焊接过程中引入磁场,利用磁场来改善焊焊缝组织,改善一次结晶,细化晶粒,提高焊接质量。本文应用逆变技术研制了一种新型的氩弧焊磁控电源,能够使激磁电流与焊接电流在一定程度上达到匹配,输出间歇交变的方波脉冲,且具有体积小、重量轻、电路简单、调节方便等特点。本文对氩弧焊磁控电源的同步电路、脉冲发生电路、放电电路等进行了设计,并对反馈电路、保护电路进行了改进。所设计的同步电路涉及元器件数量少,实现起来非常方便,同时设计的放电电路可以将线圈中的能量完全释放,从而解决因线圈过热导致设备受损的问题。本文还对氩弧焊磁控电源进行了调试,给出了测试的波形。试验表明,所设计的氩弧焊磁控电源能够输出与焊接电流相匹配的激磁电流交变方波脉冲波形,同时可以连续稳定工作,满足了焊接试验的需求。课题还设计了磁头结构,并对其进行磁场分布的模拟,在不改变激磁线圈结构的情况下,分析了焊接材料对磁场分布的影响。将所研制的磁控电源对MIG焊焊接过程施加同步磁场,利用高速摄像技术研究同步磁场对焊接电弧及熔滴过渡运动特征的影响,并比较有无磁场两种情况下母材的焊缝成形及焊缝区组织。结果表明：外加同步磁场作用下能够实现熔滴的顺利过渡,获得稳定的熔滴过渡形式；焊缝表面成形良好、焊缝组织得到有效的细化。同时也进一步验证了所研制的氩弧焊磁控电源的实用性。更多还原

【Abstract】 The applications of argon arc welding is wide in the welding range, in order to improve the quality of welding and welding productivity, people introduce magnetic field in the welding process, using the magnetic field to improve the welding seam microstructure and the first crystallization, refine grain, heighten the quality. This paper applies inverter technology to develop a new kind of argon arc welding magnetic control power, which should enable the exciting current and welding current to match in a certain extent, and output intermittent alternating square-wave pulse. It has the characteristics of small volume, light weight, simple circuit, convenient adjustment etc.In this paper, it designs synchronous circuit, pulse generating circuit, discharging circuit of argon arc welding magnetron power, and the feedback circuit, protection circuit are improved. The design of synchronous circuit involves components number less, and design of discharging circuit makes the energy released fully in coil, which solutes problems that coil overheat cause equipment damage. Magnetic control power is debugged, the test waveforms is given. Experimental results show that magnetic control power can output alternating intermittent square-wave pulse that is matched with welding current, and can continuously steady working, meet the demand of welding experiments. Topics also devise head structure, and simulate the magnetic field distribution, show the factors which affect the distribution of the magnetic field.Using the developed magnetic control power, synchronous magnetic field is applied in MIG welding. It analyzes synchronous magnetic field influences on metal transfer and the characteristic of arc motion with the advanced high-speed video camera technology. Comparing with the welding seam and microstructure, the result shows that applying synchronous magnetic field can make the melt drops transition smooth, obtain the stable transition form, and refine grain effectively. It’s tested the practicability of the developed magnetic control power successfully.更多还原