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Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO2) Double Shielded GTA Welding
Lu, Shanping1; Fujii, Hidetoshi2; Nogi, Kiyoshi2
Corresponding AuthorLu, Shanping(shplu@imr.ac.cn)
2010-02-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume26Issue:2Pages:170-176
AbstractDouble shielded gas tungsten arc welding (GTAW, also known as tungsten inert gas (TIG) welding) of an SUS304 stainless steel with pure inert argon as the inner layer shielding and the Ar-CO2 or CO2 active gas as the out layer shielding was proposed in this study to investigate its effect on the tungsten electrode protection and the weld shape variation. The experimental results showed that the inner inert argon gas can successfully prevent the outer layer active gas from contacting and oxidizing the tungsten electrode during the welding process. Active gas, carbon dioxide, in the outer layer shielding is decomposed in the arc and dissolves in the liquid pool, which effectively adjusts the active element, oxygen, content in the weld metal. When the weld metal oxygen content is over 70x10(-6), the surface-tension induced Marangoni convection changes from outward into inward, and the weld shape varies from a wide shallow one to a narrow deep one. The effect of the inner layer gas flow rate on the weld bead morphology and the weld shape was investigated systematically. The results show that when the flow rate of the inner argon shielding gas is too low, the weld bead is easily oxidized and the weld shape is wide and shallow. A heavy continuous oxide layer on the liquid pool is a barrier to the liquid pool movement.
KeywordDouble shielding Weld shape Marangoni convection Gas tungsten arc welding
Funding OrganizationNational Science Foundation of China ; Science Program of Shenyang City
Indexed BySCI
Language英语
Funding ProjectNational Science Foundation of China[50874101] ; Science Program of Shenyang City[1071275-0-02]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000275625900013
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:25[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/102752
Collection中国科学院金属研究所
Corresponding AuthorLu, Shanping
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
2.Osaka Univ, Joining & Welding Res Inst, Osaka 5670047, Japan
Recommended Citation
GB/T 7714
Lu, Shanping,Fujii, Hidetoshi,Nogi, Kiyoshi. Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO2) Double Shielded GTA Welding[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2010,26(2):170-176.
APA Lu, Shanping,Fujii, Hidetoshi,&Nogi, Kiyoshi.(2010).Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO2) Double Shielded GTA Welding.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,26(2),170-176.
MLA Lu, Shanping,et al."Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO2) Double Shielded GTA Welding".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 26.2(2010):170-176.
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