Effect of oxygen content in He-O-2 shielding gas on weld shape in ultra deep penetration TIG
文献类型：期刊论文
| 作者 | S. P. Lu ; H. Fujii ; K. Nogi ; T. Sato |
| 刊名 | Science and Technology of Welding and Joining
 |
| 出版日期 | 2007 |
| 卷号 | 12期号:8页码:689-695 |
| 关键词 | TIG welding (GTAW) weld shape oxygen helium Marangoni convection welding parameters marangoni convection oxide fluxes tungsten arc activating flux stainless-steel |
| ISSN号 | 1362-1718 |
| 中文摘要 | The effect of the shielding gas concentration on the weld shape was studied for the moving bead on plate TIG welding of SUS304 stainless steel under He-O-2 mixed shielding. The small addition of oxygen to the helium base shielding gas can precisely control the oxygen content in a liquid pool and the weld shape. Oxygen is a surface active element for stainless steel. When the oxygen content in the liquid pool is above the critical value of similar to 70 ppm, the weld shape suddenly changes from a wide shallow type to a deep narrow one due to the change in the Marangoni convection from the outward to inward direction on the liquid pool surface. Weld shape variations influenced by the welding parameters including welding speed, welding current and electrode tip work distance under pure He and He-0.4%O-2 mixed gas shielding were systematically investigated. The investigation results showed that the final shape of the TIG weld depends to a large extent on the pattern and magnitude of the Marangoni convection on the pool surface, which is governed by the combined effect of the oxygen content in a liquid pool, temperature coefficient of the surface tension (d sigma/dT) and the temperature gradient on the pool surface (dT/dr, r is the radius of the weld pool surface). It is considered that the change in welding parameters alters the temperature distribution and gradient on the pool surface, and thus, affects the magnitude of the Marangoni convection and final weld shape. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/33738]  |
| 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 | S. P. Lu,H. Fujii,K. Nogi,et al. Effect of oxygen content in He-O-2 shielding gas on weld shape in ultra deep penetration TIG[J]. Science and Technology of Welding and Joining,2007,12(8):689-695. |
| APA | S. P. Lu,H. Fujii,K. Nogi,&T. Sato.(2007).Effect of oxygen content in He-O-2 shielding gas on weld shape in ultra deep penetration TIG.Science and Technology of Welding and Joining,12(8),689-695. |
| MLA | S. P. Lu,et al."Effect of oxygen content in He-O-2 shielding gas on weld shape in ultra deep penetration TIG".Science and Technology of Welding and Joining 12.8(2007):689-695. |
入库方式： OAI收割
来源：金属研究所
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