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 / devanathen l k
Because of molecular attraction and cohesion between the
molten base metal and deposited weld metal, they bind (fuse)
to each other and the flux, which is a non-metal, gets
ejected from the weld and deposits on the top of the weld bead.
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