ステンレス溶接鋼管の高周波予熱プラズマ製管溶接法の開発

概要

論文の詳細を見る
To improve the productivity of welded stainless steel pipe, new plasma arc welding with preheating has been developed. The critical welding rate of plasma seam welding is restricted by the amount of molten metal that is generated in welding, and the separate bead that breaks out by the small amount of molten metal in high speed welding must be prevented. The preheating by high frequency current is efficient to increase this molten metal, and optimum preheating temperature for high speed welding is about 300℃. This new welding process has twice productivity as high as conventional plasma arc welding, and enables to manufacture the pipe of 3mm in thickness at a rate of 2.5m/min. At the preheating temperature over 300℃, critical welding rate is decreased caused by the lack of plasma heat transmission to base metal with the surface oxide layer generated in preheating.
社団法人日本鉄鋼協会の論文
1996-12-01