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Development of the Space Gas Hollow Tungsten Arc Welding Process for the Space Development of the World

为世界航天事业发展太空气体空心钨极电弧焊工艺的发展

基本信息

批准号：
15560634
负责人：
SUITA Yoshikazu
金额：
$ 2.3万
依托单位：
Takamatsu National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560634/
关键词：
Space Welding Space GHTA Welding GHTA Welding Space Station Aluminum Alloy Arc Discharge Welding Phenomenon Arc Start

项目摘要

In 1993, we proposed a unique and safe space GHTA (Gas Hollow Tungsten Arc) welding technology which can be performed in a vacuum. We carry out the research and development for the space applications of this technology. We established the technologies which safely surely start the arc discharge at space environmental pressure 10^<-5> Pa and technology which removes the oxide film on the molten pool of aluminum alloy in a vacuum. As a result, we were able to establish the basic technology for applying the space GHTA welding in this research.1. Phenomena of arc start by DC high-voltage starting method and touch starting methodThe high-frequency starting method which was employed for the arc star of welding may be obstacle for electric devices placed on the ISS due to electromagnetic noise. Therefore, we conducted the start experiments of welding on an aluminum alloy by the DC high-voltage starting method and touch starting method with the space GHTA welding machine at the ISS orbital pre … More ssure. The arc starts of welding on aluminum alloy were shown to be possible by use of these starting methods, and the characteristics of these arc starts in a vacuum were clarified.2. Effects of welding parameters in DC high-voltage and touch starting methods on arc starting phenomenaWe investigated the effects of the welding parameters in these starting methods on the starting phenomena. We confirmed that the touch starting method excels the DC high-voltage starting method in performance, weight, safety.3. Welding phenomena and removal mechanism of oxide films on molten pool in aluminum alloyWe discovered that the oxide films on molten pool in aluminum alloy could be removed by using the inverter-controlled pulsed DC GHTA welding machine in a vacuum. The removal mechanism of oxide films was clarified by the observation with high-speed video camera. We also demonstrated that the butt welding joints on aluminum alloy welded by supplying a filler wire under removing the oxide film, having the enough strength. Less

1993年，我们提出了一种独特而安全的空间GHTA（气体空心钨极电弧）焊接技术，可以在真空中进行。我们正在研究和开发这项技术的空间应用。建立了在空间环境压力10 μ Pa下安全可靠地启动电弧放电的技术<-5>和在真空中去除铝合金熔池上的氧化膜的技术。为空间GHTA焊接技术的应用奠定了基础.直流高压起动法和接触起动法引弧现象焊接引弧星星采用的高频起动法由于电磁噪声可能对放置在ISS上的电气设备造成障碍。为此，我们在国际空间站轨道试验台上，利用空间GHTA焊机，采用直流高压启动法和接触启动法，对铝合金进行了焊接启动试验 ...更多信息 sure.试验结果表明，采用这些引弧方法可以实现铝合金焊接的起弧，并阐明了真空条件下的起弧特性.直流高压和接触引弧焊接工艺参数对引弧现象的影响本文研究了这两种引弧方法中焊接工艺参数对引弧现象的影响。通过实验验证，触摸启动方式在性能、重量、安全性等方面优于直流高压启动方式.铝合金熔池氧化膜的焊接现象及去除机理研究发现，在真空条件下，利用逆变控制的脉冲直流GHTA焊机可以有效地去除铝合金熔池氧化膜。通过高速摄像观察，阐明了氧化膜的去除机理。同时还证明了在去除氧化膜的条件下，采用填充焊丝焊接铝合金的对接接头，具有足够的强度。少