ボンドフラックスによるサブマージアーク溶接の研究(第 8 報) : 9%Ni 鋼の溶接部の性能調査

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Performances of submerged arc welds by using a bonded flux experimentally produced for low temperature material (Aluminum killed steel, 35% Ni steel) were described in the previous report. Using the bonded flux experimentally manufactured for the purpose of achieving automatic welding of 9% Ni steel for lower temperature use (from -101℃ to -196℃) use, the tests of tensile strength and impact vafue at low temperature of submerged arc welded metal have been conducted. The results obtained are summarized as follows : (1) Because the bonded flux H-900 for 9% Ni steel is low hydrogen type of mixture without SiO_2 content it is somewhat poor in operating property, whereas the use of direct current reversed polarity results in good operating property and bead weld. (2) The mechanical properties of 9% Ni steel plate at -196℃ were satisfactory : 100kg/(mm)^2 in tensile strength, 80kg/(mm)^2 in yield point, 20% in elongation and 6kg-m in impact value. Accordingly, when designing equipments with this steel, it is possible to reduce its thickness considerably. (3) The mechanical properties of all deposited metal at -196℃ are 87kg/(mm)^2 in tensile strength, 55kg/(mm)^2 in yield point, 30% in elongation, and 3.5kg-m in impact value, all of which satisfy the standards at low temperature prescribed in ASTM. (4) The highest hardness of heat-affected zone is approximately 360 in Hv as welded, while it decreases to about 290 in Hv after stress relief annealing at 570℃ for 2 hours. There is found no transverse crack of bead weld and no crack of heat-affected zone, but the non-removed crater leads to a development of crater cracks.
社団法人溶接学会の論文
1967-02-25

ボンドフラックスによるサブマージアーク溶接の研究(第 8 報) : 9%Ni 鋼の溶接部の性能調査

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