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oai:kitami-it.repo.nii.ac.jp:00006326 2025-01-30T05:14:16Z 7:15:25

A study on the performance of nozzles of CO_2 Arc Welding (Part 1) CO_2アーク溶接ノズルの特性と耐風効果（第１報） 二俣, 正美 32175 棟, 徹夫 32176 阿部, 清 32177 application/pdf In order to improve a CO_2 arc welder which operates in windy outdoor places，3 type of welding nozzles，i.e. A，B and C type were manufactured. In this case， A means a single-shielded nozzle，B means a dual-shielded nozzle and C means a swiring voltex shielded nozzle. Experiments were carried out on the distribution of　shielding　gas　velocity，the shape of jets and the effect of CO_2 gas flow-rate on welds. Results of the experiments are obtained as follows : ? 　　(1)The distribution of gas velocity with A type nozzle shows a convergent solid pattern and B type shows a semi-radial pattern. On the shape of jet，C type may have all patterns from a convergent solid to a complete radial pattern. 　From these results，it is considered that the C type nozzle is for practical welding better than the other nozzles. (2)　When A type nozzle was used，defects were not found in the welds in　the region of 70?80l/min. of CO_2 flow-rate. departmental bulletin paper 北見工業大学 1973-03 application/pdf 北見工業大学研究報告 2 4 273 283 https://kitami-it.repo.nii.ac.jp/record/6326/files/4-2-5.pdf https://kitami-it.repo.nii.ac.jp/records/6326 jpn