4) 熔接に於ける龜裂問題とその防止對策

概要

論文の詳細を見る
In this paper (1) Various Tests for Crack Tendency of Arc welding Electrodes, (2) weldability Tests of Steel Plates, (3) Notch Sensitivity Tests of Steel plates and (4) Prevention of Cleavage Fracture in Welded Structures are discussed. Crack tendency of arc welding electrodes may be recognised as depending on two different characteristics, one of which is the volume change of weld metals from molten to solid states and another is the expansion of welded joints. The latter case is fairly analized by many researchers and me. Study on weldability of steel plates have been developed by German engineers. Special attention have been paid to some elements of composition of St. 52 and Chromium, Manganese and Silicium are responsible to hardnability of fusion zone. It must be mentioned, however, that limitation of these elements by specification is not good certification to prevent the cleavage fractures of Budersdorfer bridge. Notch sensitivity and transition temperature of steels rimmed or killed are thoroughly tested in the United States during and after the War. Author introduces these investigations from H. W. Pierce's papers reported on Jr. of the Japan welding Society. Finally author states that the continuity in designing of structures is the best method for prevention of these cracks.
社団法人日本建築学会の論文
1950-02-20