Why Slag comes on top of weld bead & if ur answer is
related to density then think of overhead welding if slag
is ligter than weld metal then in overhead welding firstly
a laye of slag & then a layer of weld metal must be
deposited.
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Answer Posted / pratik patel
That slag is nothing but the FLUX, Welding rods are covered
with flux, in TIG & MIG welding this function is done by
INERT gas. The function of FLUX is to cover the heated
(welding) zone and to prevent contamination of it with
outside air.
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