軟鋼サブマージアーク溶接金属の機械的性質におよぼす磁気撹拌の影響
溶接部の諸特性におよぼす磁場の影響(第2報)
1973 年 42 巻 2 号 p. 146-156
詳細
1973 年 42 巻 2 号 p. 146-156
A few reports have been made on the influence of electromagnetic stirring on weld zone, from the point of minimization of crystal grain and acceleration of blowhole decrease, in the case of TIG and MIG welding for titanium alloy or aluminium alloy.
But the application for Submerged-arc welding has not been experimented. Therefore, in the former report, the authors investigated, how the electromagnetic stirring made influence on its bead shape, penetration and solidification structure of D.C.submerged-arc welding of mild steel. From this study the authors made it clear that the shape of penetration showed very peculiar change and that the primary crystals of weld metal were minimized.
In this cotinuous report, the authors investigted how electromagnetic stirring hardness distribution and notch toughness of Submerge-arcd weld zone changed.
The authors measured the hardness distribution by micro-Vickers Hardness tester, and the notch toughness by V-notch Charpy impact test. From these studies the authors have found out the following results.
1) The hardness increases by electromagnetic stirring.
2) As to the notch toughness, the authors made the transition curves of absorbed energy and fracture phase from the impact test, and from them, obtained the transition temperature of both 15ft-lb and fracture phase.
As the result it became clear that both of the transition temperatures moved to the lower temperature side by 20 degrees C. The author also made the micro observation of fracture phases of impact test pieces with electron microscope and considered the changes of shape of the destructive phase caused by electromagentic stirring.
