ASTM A pdf – Download as PDF File .pdf), Text File .txt) or read online. 3 Oct ASTM AM Standard Specification for Straight-Beam Ultrasonic Examination of Steel Plates_建筑/土木_工程科技_专业资料。. ASTM-A, ASTM-A, BS-EN and others). Reports. A test report documenting inspection and analysis results can be automatically produced at the.
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I believe requires grid scanning only and is not a very tough test to pass.
I would think that your Gain would be reduced by 8db or more even and that would lower both, the back-surface reflecion and the crack-reflection, that we can see in the Asgm image. I personally would count these small cracks as grossly unacceptable because there is obviously a lack of consistent workmanship in these welds. This abstract is a brief summary of the referenced standard.
There is a photo of these cracks in atttachment and these crack length is about mm long but there is lots of where in plate.
No customer wants products that have cracks in them and no manufacturer wants to redo material that is acceptable to the standard they are working to.
Our client learned an expensive lesson on UT examination, and testing for end use. You say that you get a reflection from the middle of the plate thickness Combining values from the two systems may result in nonconformance with the specification.
Any discontinuity indication causing a total loss of back reflection which cannot be contained within a circle is unacceptable. One thing that was not mentioned is the material of the plate? You said the plate is not going to be machined either – I suppose this plate that goes to the crane would not be a load-bearing plate and might attach with rivots or something?
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Bring it to the attention of your supervisor and if they deem it acceptable then let them sign for the weld. Are there more in the material in other places that are too small to detect with the technique you are using? Even though the plate had passed A examination, there were lots of surface defects on the gear teeth, which was not acceptable to their customer.
Unfortunately, they don’t seem to have mentioned to you or anyone else about having any “cracks” or “crack-like” indications allowed. That is the main question you have to ask yourself. Link to Adtm This link will always route to the current Active version of the standard. This specification covers the standard procedure and acceptance for straight-beam, pulse-echo, ultrasonic examination of rolled fully killed carbon and alloy steel plates.
It is clear that your customer has asked for a steel plate of approximately 80mm thick and asked for “ultrasonic inspection” be performed on the plate s. The equipment shall be of the pulse-echo straight beam type. Combining values from the two systems may result in nonconformance with the specification. They may be in a whole other Country for all I know, and might not be able to visit — I think documentation, telecom, and email concurrance would be good for you guys to do.
Can they be ground out? Csaba; you said “any intermediate reflectors are cause for rejection” But we can not do this because we have to work with respect to standard. asrm
Yasin – You are quite welcome to my opinions, and I thank you for answering the other guys and astj providing those awesome images!! Within the text, the SI units are shown in brackets. These indications are in the middle of the plate.
The macro image is awesome — it would appear to me that this crack is a little more than um [0. The plate will be used for crane truss. As the NDT technician that found the cracks I would only sign a report that stated “non relevant intermittent stepwise cracking indications found and astn as per ASTM as instructed by management” or something similar. Referenced Documents purchase separately The documents listed below are referenced within the subject standard a453 are not provided as part of the standard.
Grid scanning shall be continuous along perpendicular grid lines or shall be continuous along parallel paths, transverse to the major plate axis, aa435 shall be continuous along parallel paths, parallel to the major plate axis, or smaller centers. Materials fail when a fracture grows until it passes its yield point. As I understand it there are no welds involved.
I personally would not accept the welds unless I had it in writing that the small cracks you saw under macro section were acceptable. This procedure is not normally used to detect cracks. Dent ; We produce these plate. Combining values from the two systems may result in nonconformance with the specification.
Review the drawings with them and determine if this is located in an area closer to one edge or the other where it may be sectioned away before delivery or something. Historical Version s – view previous versions of standard.
Its future usefulness has to be decided by designer or client not by UT man. If you accept this plate and the crane truss fails and the material is traced back to your company and then to you as the inspector is your butt covered? When we take signal we cut the plate and look with microscope. Link to Active This link will always route to the current Active version of the standard. A number in aa435 indicates the year of last reapproval.
The question to me would be, can the purchaser work around this area or could it be sectioned out if it is not too far from an edge? Brenton ; forget the weld. These UT signal is not bigger than 75 mm but every 1 or 2 meter this signal have taken.