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How to prevent mill scale on ID of pickeld pipe
Posted: Tue Apr 06, 2010 5:31 pm
by tjsmetalart
We are welding pickeld steel pipe root and hot pass are tig er70s with argon purge and cap7018 uphill.Any way to eleminate the mill scale caused by welding.Or tips on flushing pipe out its for hyd.fluid 2"sch 40
Re: How to prevent mill scale on ID of pickeld pipe
Posted: Sat Jun 05, 2010 11:13 pm
by tigamajig
mineral spirit flush ....a parts wash pump and an extra barrell.
Re: How to prevent mill scale on ID of pickeld pipe
Posted: Mon Jul 19, 2010 9:06 pm
by ironmonger
If you are purging the tig weld just continue the purge for the 7018 pass/passes.
Once the pipe is completely purged and the root pass is in you can reduce the argon flow rate to almost nothing. Welding doesn't create oxygen inside the pipe and the 'mill scale' is iron oxide.
No oxygen... no scale.
paul