ボンド・フラックスによるサブマージアーク溶接の研究(5 報) : アルミキルド鋼と低 Ni 鋼用ボンド・フラックスによる溶接部の性能調査

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In the Petro-chemical industry, various equipments operating at low tempesatures are increasing, and generally Aluminum killed steel down to -46℃ and 3.5% Nikel steel down to -101℃ are used as low temperature service structural materials. For these low temperature materials including their weld metals, the properties specified in the relevant clauses of ASTM A-300 are to be satisfied. Detailed reports on the properties for Aluminum killed steel and 3.5% Nikel steel materials and on those of weld metals made reports were with coated electrode arc welding was published in the past, and also reports were made for the case of MIG welding. However, there are only few papers of submerged are welding which considered as most efficient among all automatic welding methods ever applied to this type of welding work. Therefore we experimentally processed several bonded fluxes intended for the specific use in a submerged arc welding method applicable to low temperature steels, and investigated various properties, particularly impact values, of such weld metals obtained with these bonded fluxes. The results of experiment are summarized as follows; (1) In the case of Aluminum killed steels, weld metal made with either of B+H-540 or B+H-350 combination satisfies the low temperature specification of ASTM as these have good mechanical properties and low temperature impact values. (2) In the case of submerged arc welding, the low temperature properties of weld metal are affected greatly by flux compositions. Therefore, the use of flux having characteristics of a low hydrogen type with large amount of CaCO_3 content is recommended. Also, the low temperature impact values obtained on the weld metal are better for multipass weldieg with a small current than single pass welding with a large current. (3) In the case of single pass welding for Aluminum killed steels with a large current, the H-525 flux to which Fe-Al and Ni are added is preferable, and the weld metal obtained on such well generally gives a good low temperature impact values. (4) 3.5% Nickel wire and H-350 flux combination gives a good results for 3.5% Nikel weld metal. Possible low temperature impact value can be improved by a weld made with a low hydrogen type flux and small diameter rod combination in comparison to one made with large size rods, since the former tends to have a higher deposit metal temperature rise which boosts up the weld metal cleanliness than the latter.
社団法人溶接学会の論文
1965-01-25

ボンド・フラックスによるサブマージアーク溶接の研究(5 報) : アルミキルド鋼と低 Ni 鋼用ボンド・フラックスによる溶接部の性能調査

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