高マンガン鋼と高炭素鋼との溶接(第 1 報) : 被覆アーク溶接の場合

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The welding of austenitic manganese steel to high carbon steel has been thought to be very difficult due to the difference of their metallurgical properties and others. The authors paid special attention to the procdeure to join them by manual arc welding after buttering the groove face of carbon steel. Various fundamental experiments were performed to select proper electrodes for buttering and joining, and welding conditions, though mention here is given mainly of the buttering electrode selection tests- 1) Hardness test and microscopic inspection of weld metal, 2) Angle-expanding type cracking test of weld metal and, 3) Impact test of weld zone. Based on the results obtained, austenitic manganese steel rail and carbon steel rail (high carbon steel) were welded together, and the welded rails were subjected to bending test, drop-weight test and so forth. The results show that considerably reliable welds are obtained if they are welded together by the following methods : 1) Austenitic manganese steel which has good weldability and no casting defects is used. 2) The welding groove is finished to V or X and arc welding process is executed in flat position. 3) The vicinity of the groove of carbon steel is preheated to 300-400℃, then two layers with 25Cr-20Ni or 25Cr-12Ni type electrodes or one more layer with 16Mn-16Cr type electrodes are buttered over the groove face. 4) The manganese steel rail and the buttered carbon steel rail are welded together with 16Mn-16Cr electrodes. Craters are peened after each pass followed by forcible cooling of the weld zone. 5) The impurities contained such as phosphorus should be as low as possible in the electrodes and the electrodes should give weld metals of very low crack susceptibility. 6) The postheating which is usually adopted for the welding of high carbon steel is not performed. The final object of this study is to establish the prodceure to weld austenitic manganes steel crossing to carbon steel rail and the welds are now under field test.
社団法人溶接学会の論文
1970-12-25

高マンガン鋼と高炭素鋼との溶接(第 1 報) : 被覆アーク溶接の場合

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