By coating fluxes consisting of Ca(OH)
2, CaF
2 and Na
2CO
3 on a low carbon steel rod, many kinds of covered electrode were made and their weldability was examined. The result of the examination is as follows.
When CaF
2 content in the coating is large, (1) Spattering is comparatively less, (2) the flux sheath protecting molten iron drops for the atmosphere forms satisfactory, (3) rising up of slag in molten pool is fairly rapid, (4) the molten flux or slag covers the deposited metal, (5) after the welding the removal of slag c, ver is easy, (6) the appearance of deposited metal is fairy fine, (7) but in case of welding, gas evoluron in the crater occurs intensely and consequently the deposited and solidified metal contains many blow hobs.
If th se blow holes could therefore be removed by an action of other ingredients in the coating or rod, the fluxes rich in CaF
2, are considered to be an efficient componeit in the coating.
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