局部真空方式電子ビーム溶接の配管への適用に関する検討(昭和59年度秋季全国大会論文発表講演論文)

概要

論文の詳細を見る
Local vacuum electron beam welding has been developed to apply it to pipe welding from the inside of a pipe. The gun of this machine with the maximum output of 15 kW (30 kV×500 mA) is able to weldpipes which are 267 mm in outer diameter and 6 m in length. In order to establish pipe welding by using local vacuum electron beam welding, we investigated the method of local vacuum seal, the control of the penetration bead formation, and the problem about the electron gun discharge. The results obtained are as follows : (1) Local vacuum seal mechanism by combining the air expansion tube and 0 rings can keep the vacuum pressure lower than 3×10^<-3> Torr.(2) The uniform and stable penetration beads are formed by controlling piercing beam current in welding carbon steel pipes of 9.3-30.9 mm in thickness in flat and vertical positions.(3) It is effective for preventing weld defects caused by the electron gun discharge to provide a highspeed turn off-turn on circuit on high voltage secondary side of the power supply.
社団法人溶接学会の論文
1984-08-05