@article{oai:kitami-it.repo.nii.ac.jp:00006326, author = {二俣, 正美 and 棟, 徹夫 and 阿部, 清}, issue = {2}, journal = {北見工業大学研究報告}, month = {Mar}, note = {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.}, pages = {273--283}, title = {CO_2アーク溶接ノズルの特性と耐風効果(第1報)}, volume = {4}, year = {1973} }