Process for production of a low hydrogen type covered arc-electr

Details Process for production of a low hydrogen type covered arc-electr Process for production of a low hydrogen type covered arc-electr

1981-02-02

1982-10-19

Lusignan, Michael R.

Coating processes

Electrical product produced

Welding electrode

427 59, 4271262, 4271263, 4271264, 4273762, 4273764, 4273765, 427380, 4273978, B05D 512

Patent

active

043550541

ABSTRACT:
In a low hydrogen type covered arc-electrode, the sources of diffusible hydrogen are kept to a low level by selecting kind of the ingredients for producing the electrodes or by baking the ingredients. In the process of the present invention, the covered arc-electrode is baked at a high temperature so as to extremely reduce the amount of the sources of diffusible hydrogen of the weld metal, while decomposition of limestone, which is one of the covering components, is prevented due to a novel baking atmosphere containing CO.sub.2. The weight ratio of Na.sub.2 O/K.sub.2 O in the covering is adjusted to be 1 or more, so as to keep amount of fumes.

REFERENCES:
patent: 2686134 (1954-10-01), Yeadon
patent: 2697159 (1954-12-01), Donahey
patent: 3560273 (1971-02-01), Peterson
patent: 3694259 (1972-09-01), Chapman
patent: 3783020 (1974-01-01), Kimura et al.

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