Abstract
The author prepared many ingots of manganese-chromium steels which have an austenitic structure or consist of an austenitic and ferritic structure. Then he worked them at high and room temperature and in this way trially manufactured core-rods, and made coated electrodes. Subsequently he welded one kind of alloy steel with these electrodes, and observed the appearances and the sections of welded specimens, and measured hardnesses of weld metals. The following results were obtained by these experiments.
(1) If Mn-Cr steel rods, which contain above 30% or so Mn and have a stable austenitic structure, are used, cracks are apt to occur in the weld metal or in the heat-affected zone.
(2) If Mn-Cr steel rods, which contain under 30% or so Mn and have a stable austenitic structure, are used, cracks do not occur in the weld metal, but the occurrence of cracks in the heat-affected zone isxnot prevented,
(3) If Mn-Cr Steel rods, which containl5.25 % Cr and under about 12% Mn and consist of a ferritic and austenitic structure, are used, the occurrence of cracks in the heat-affected zone is prevented, but cracks are apt to occur in the weld metal.
(4)If coated electrodes made of Mn-Cr steel rods, which contain about 15% Cr and 13-20% Mn, and suitable coating, are used, the results of such welding show a tendency that cracks are prevented both in the weld metal and heat-affected zone.
And the author considered about such results from many points of view.
