Development of an advanced A-TIG (AA-TIG) welding method by control of Marangoni convection
文献类型：期刊论文
| 作者 | H. Fujii ; T. Sato ; S. Lu ; K. Nogi |
| 刊名 | Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
 |
| 出版日期 | 2008 |
| 卷号 | 495期号:1-2页码:296-303 |
| 关键词 | Weld shape Oxygen Helium Marangoni convection Electromagnetic convection Double shielding gas gas tungsten arc shape variations oxide fluxes penetration parameters |
| ISSN号 | 0921-5093 |
| 中文摘要 | A new type of tungsten inert gas (TIG) welding has been developed, in which an ultra-deep penetration is obtained. In order to control the Marangoni convection induced by the surface tension gradient on the molten pool, He gas containing a small amount of oxidizing gas was used. The effect of the concentration Of O-2 and CO2 in the shielding gas on the weld shape was studied for the bead-on-plate TIG welding of SUS304 stainless under He-O-2 and He-CO2 mixed shielding gases. Because oxygen is a surface active element for stainless steel, the addition of oxygen to the molten pool can control the Marangoni convection from the outward to inward direction on the liquid pool surface. When the oxygen content in the liquid pool is over a critical value, around 70ppm, the weld shape suddenly changes from a wide shallow shape to a deep narrow shape due to the change in the direction of the Marangoni convection. Also, for He-based shielding gas, a high welding current will strengthen both the inward Marangoni convection on the pool surface and the inward electromagnetic convection in the liquid pool. Accordingly, at a welding speed of 0.75 mm/s, the welding current of 160 A and the electrode gap of I mm under the He-0.4%O-2 shielding, the depth/width ratio reaches 1.8, which is much larger for Ar-O-2 shielding gas (0.7). The effects of the welding parameters, such as welding speed and welding current were also systematically investigated. In addition. a double shielding gas method has been developed to prevent any consumption of the tungsten electrode. (c) 2008 Elsevier B.V. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/32767]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | H. Fujii,T. Sato,S. Lu,et al. Development of an advanced A-TIG (AA-TIG) welding method by control of Marangoni convection[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2008,495(1-2):296-303. |
| APA | H. Fujii,T. Sato,S. Lu,&K. Nogi.(2008).Development of an advanced A-TIG (AA-TIG) welding method by control of Marangoni convection.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,495(1-2),296-303. |
| MLA | H. Fujii,et al."Development of an advanced A-TIG (AA-TIG) welding method by control of Marangoni convection".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 495.1-2(2008):296-303. |
入库方式： OAI收割
来源：金属研究所
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