Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Hiroshi Saita

Tomokazu Godai

Tetsuo Suga

Shoji Minato

Osamu Tanaka

Makoto Yamaga

Minoru Kobayashi

Yoshizo Hashimoto

Koji Koyabu

Yukinobu Matsushita

Shinji Kimura

Shingo Maki

Kazuhiro Takeba

A flux for overlay welding, essentially containing by weight 30-70% of CaF.sub.2, 10-30% of Al.sub.2 O.sub.3, 1-15% of CaO, 5-25% of SiO.sub.2 and 5-25% of MgO such that the total amount of CaF.sub.2, Al.sub.2 O.sub.3, CaO, SiO.sub.2 and MgO is greater than 70%, while satisfying the conditions of MgO/(Al.sub.2 O.sub.3 +SiO.sub.2).gtoreq.0.20, MgO/SiO.sub.2 .ltoreq.2.0 and MgO/Al.sub.2 O.sub.3 .ltoreq.2.0.

Flux for overlay welding

The present invention relates to a coated welding electrode containing at least 0.5% of Cr based on the total weight of the welding electrode and comprising a metal core and a coating flux composition. In this welding electrode, the content of Na and K components in the coating flux calculated as (Na.sub.2 O + K.sub.2 O) is reduced below 1% based on the total weight of the coating flux composition, whereby amounts of fumes generated at the welding step, especially the amount of toxic soluble Cr, are suppressed and minimized.

Coated welding electrode containing chromium

Growing community of inventors

Fujisawa, Japan

Hiroshi Saita