In order to find out a good flux for submerged arc welding, various expeniments were executed, and following results are obtained.
(1) For the welding, the most suitable melting point of the flux was about 1, 350°C and the specific gravity was 4.5.
(2) According to the result of the mechanical tests, the flux is applicable to practice.
(3) The welding current showed the most satisfactory effect at 900-1, 000A and finenese of powder was most favorable at 20-50. mesh.
(4) An electrode contained high manganese was more effective.
(5) The moisture in the flux must be removed as for as possible.
(6) A backing was used on account of prevention of metal-flow.
(7) The flux made from mineral untreated. was not satisfcatory in mechanical tests, so it was remained for a future research.
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