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[MW:2702] blow holes in double side welding in H-Beam SAW welding

By Materials & Welding
Hi everyone out there,
I am presently working in kirby building systems . we do PEB
fabrication .we use material ASTM A572 typ1 gr50 .the p[roblem is when
we do doubl;e side welding, blow holes occur in second side . what is
the basic reason .allso waviness occurs in flanges of thickness 6mm
and less,
thanks,
rohit rawat
QA(quality assurance)

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