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No.14 (1977/09) >

 
Title :インプラント試験による高張力鋼の溶接性に関する研究
Title alternative :Study on Weldability of High Strength Steel by Implant Test Method
Authors :屋良, 秀夫
真喜志, 康二
平敷, 兼貴
Authors alternative :Yara, Hideo
Makishi, Yasuji
Heshiki, Kenki
Issue Date :30-Sep-1977
Abstract :Weld cracking is the most important problems in constructing steel structures. In order to study weld cracking, each relation as follows has been investigated; the relation between the water content of the flux and the diffusible hydrogen in deposited metal based on JIS hydrogen test method, the relation between the applied stress and the occurrence of weld cracking varied dry conditions of the electrode by using Impant Test, and the relation between the diffusible hydrogen and the fracture by using scanning electron microscope. The results are summarized as follows; (1) In ilmenite type electrode (D4301) as the water content of the flux is increasing, the diffusible hydrogen in deposited metal is also increasing straightly. Using the dried electrode, a lot of the diffusible hydrogen are included in deposited metal. (2) In low hydrogen type electrode (D5016 and E11016) as the water content of the flux is increasing until 2%, the diffusible hydrogen in deposited metal is rapidly increasing. (3) The electrode that the moisture absorbability is high is E11016. (4) In high strength steel, the stress range that occurrs in weld cracking becomes wide by using wetted electrode. (5) In the case of using dried electrode (D4301) and wetted electrode (E11016) the relation between the applied stress and the fracture time are almost the same results. (6) The fracture has intergranular pattern near the notch in each applied stress in the case of wetted electrode used, and it is considered that this place is the cracking initiation point. A lot of dimple pattern fracture is observed near the notch in the center of the specimen. (7) The fracture has a little intergranular pattern near the notch in the case of dried electrode used, more than 50% of the fracture has the dimple pattern. The more high applied stress, the more river pattern is observed. (8) The objects at the bottom of the dimple pattern fracture is Mn-Si system spheroidal inclusion.
Type Local :紀要論文
ISSN :0387-429X
Publisher :琉球大学理工学部
URI :http://hdl.handle.net/20.500.12000/26854
Citation :琉球大学理工学部紀要. 工学篇 = Bulletin of Science & Engineering Division, University of the Ryukyus. Engineering no.14 p.1 -9
Appears in Collections:No.14 (1977/09)

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