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[MW:15320] IQI SELECTION

dear experts,
I got a prob in selecting IQI for DWSI pipe.
for eg, I select a pipe of 9mm single wall thickness and reinforcement
is 3mm i read that i must use single wall thickness to select IQI but
now I select a weld joint of 21mm thickness what IQI will u choose for
that.
as both job are given same time how could we expect to see different
wires am confused pls help

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