Laser welding
Laser welding
(OP)
I have to create on purpose very small defects (>4mm) on Al stainless steel and 304L welds (by laser welding).The reason for doing that is to check a if a new NDT system can detect them.
The thickness of the samples will be 2, 5 and 10cm.
Do you think that I will be able to creat very small cracks by rapid water cooling after the welding or is there any other way?
The thickness of the samples will be 2, 5 and 10cm.
Do you think that I will be able to creat very small cracks by rapid water cooling after the welding or is there any other way?





RE: Laser welding
Your process for introducing weld defects will not be controlled. I would suggest you EDM notches and small flat bottom holes to simulate defects.
RE: Laser welding
RE: Laser welding
What metengr is suggesting is a standard industry technique using Electrical Discharge Machining (EDM) to introduce a linear defect of a certain known width for calibrating NDT equipment. It is the de facto standard for calibrating eddy current detectors used in the welding of tubes. Machining holes into a surface is another commonly used technique, but I will let others comment specifically on how to create them. The following link is a Google search using EDM + notch + eddy current:
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RE: Laser welding
http://www.phtool.com/pages/edm.asp
RE: Laser welding
RE: Laser welding
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Plymouth Tube
RE: Laser welding
RE: Laser welding
It appears that you are not familiar with the engineering of developing calibration blocks. You might consider sourcing them for now,till you learn the different aspects of machining etc.
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RE: Laser welding
you have been really helpful.
I have to say that I work in Geneva,Cern and the NDT method we want to check is digital radiography.
Not ultrasonic nor eddy.
Thanks again!
RE: Laser welding
Regards,
Cory
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RE: Laser welding
Chocolates,men,coffee: are somethings liked better rich!!
(noticed in a coffee shop)