高強度レールの新エンクローズアーク溶接法と継手性能 : レールの高炭素系溶融溶接技術の研究(第2報)(平成3年度秋季全国大会論文発表講演討論記録)

概要

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This paper describes the use of high-C welding materials for enclosed-arc welding of high strength rail. Experiments have been done to improve the facility of manipulation of the high-C electrodes to find the optimum welding procedures and to find weld joint performances of high-C welds. The experimental results are as follows : 1) It is necessary to keep the flux weight ratio to core electrode between 22 and 23%, the ratio of CaO/CaF_2 in flux around 1.6,and carbon content in weld metal less than 0.5% so that welders can preferably manipulate electrodes to remove molten slag swiftly out of molten weld pool. 2) The welding conditions and the pass sequences specific to the high-C welding have been found so that sound welds free from solidification cracks in weld metal and liquation cracks in HAZ can be obtained.
社団法人溶接学会の論文
1992-02-05