Crack On the Surface of Thick Plate
Crack On the Surface of Thick Plate
(OP)
We have one 80 mm thickness plate which has welded to a part. After MT and PT we saw some indications like crack near the welded zone. First we thought that they are HAZ cracks but finally we understood that these indications can be seen even in non-welded plates and also these indications are not related to surface scales because they can be seen on grinded parts.
After grinding to 0.5 mm they disappeared and their Accumulation increase near welded area and machined edges. They lay in the rolling direction.
Finally we think that they are the rolling defects
What are they? What is the reason of these indications? Can they influence on the mechanical properties?
After grinding to 0.5 mm they disappeared and their Accumulation increase near welded area and machined edges. They lay in the rolling direction.
Finally we think that they are the rolling defects
What are they? What is the reason of these indications? Can they influence on the mechanical properties?
RE: Crack On the Surface of Thick Plate
RE: Crack On the Surface of Thick Plate
Nigel Armstrong
Karachaganak Petroleum
Kazakhstan
RE: Crack On the Surface of Thick Plate
Hope this helps...
Regards
SWM
RE: Crack On the Surface of Thick Plate
Please do lamination check with UT to detect that defect.
RE: Crack On the Surface of Thick Plate
Without knowing what the material is and what condition it is in, i.e, as rolled, annealled, normalized, quenched and temperered, at best the other responses are conjecture.
As to their influence on the service of the component, what is the direction of stress relative to the "cracks" you observed? Is it going to be used at elevated temperature or room temperature, is the service conditions static or cyclic in nature?
The responses are only as good as the information provided.
Any response for "metengr" is always on the money.
Best regards - Al