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  ERW & Black spots

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Author Topic:   ERW & Black spots
posted 12 January 2000 06:24 PM           Edit/Delete Message   Reply w/Quote
Could someone please tell me how to control black spots. As a QC/NDT Supervisor this defect is driving me nuts not to mention my other plant inspectors. We make tubular products;cold rolled steel (4inch to 8inch)in various gauges.
Any info would be greatly appreciable.

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Marc Smith
Cheech Wizard

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From:West Chester, OH, USA

posted 12 January 2000 09:43 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
I can't personally help you here. Maybe one of the others can. This sounds like it is pretty much process / product specific. Are you talking about black spots on x-rays?

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posted 13 January 2000 10:29 AM           Edit/Delete Message   Reply w/Quote
No, not on an x-ray, I wish it was that simple. Black spots, sometimes called penetrators is a steel/process defect in the weld produced in ERW. A non-bonded area in the weld zone.

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