| Development of an advanced A-TIG (AA-TIG) welding method by control of Marangoni convection |
| H. Fujii; T. Sato; S. Lu; K. Nogi
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| 2008
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| 发表期刊 | Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
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| ISSN | 0921-5093
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| 卷号 | 495期号:1-2页码:296-303 |
| 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. |
| 部门归属 | [fujii, hidetoshi; lu, shanping; nogi, kiyoshi] osaka univ, joining & welding res inst, osaka 5670047, japan. [sato, toyoyuki] taiyo nippon sanso corp, welding technol ctr, yamanashi 4080015, japan. [lu, shanping] chinese acad sci, inst met res inst, shenyang 110016, peoples r china.;fujii, h (reprint author), osaka univ, joining & welding res inst, osaka 5670047, japan;fujii@jwr.osaka-u.ac.jp
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| 关键词 | Weld Shape
Oxygen
Helium
Marangoni Convection
Electromagnetic
Convection
Double Shielding Gas
Gas Tungsten Arc
Shape Variations
Oxide Fluxes
Penetration
Parameters
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| URL | 查看原文
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.imr.ac.cn/handle/321006/32767
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| 专题 | 中国科学院金属研究所
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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.
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| 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.
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| 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.
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