Transcript
OmniScan MX2 Training Program Manual Inspection Preparation
MX2 Training Program – Manual Inspection - Overview
This section assumes that the group wizard, any required calibrations, and UT settings have been configured and are ready for the inspection. The next series of slides explain the various parameters that are typically required for a manual inspection where an encoder or scanner is not being used.
In a manual inspection there is no direct relationship between the data and the probe position or indication unless it is specifically entered by the operator after a flaw is found. That process is explained in the recording defects section relative to the indication table and report.
In a manual inspection depth and height sizing (UT axis) are completed using the tools in the software, but the flaw length (Scan axis) is performed manually and marked directly on the component.
Again, prior to preparing the inspection parameters the phased array group wizards, calibrations, and UT settings should have already been completed as described in earlier sections.
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MX2 Training Program – Manual Inspection – Checklist
A manual inspection is an inspection where the probe is manipulated by hand and does not include use of an encoder or scanner. The probe position has no directly reference to the data until entered by the operator after an indication is detected. (Index axis or probe offset) The below parameters were explained in earlier sections and are summarized again in the below list. This series of tasks is necessary to prepare the MX2 for a manual inspection. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
Set UT reference gain. (UT>Advanced>Reference>On) Set part thickness. (Probe\Part>Parts>Thickness) Set gate position and mode. (Gate\Alarm>Gate>Position) Select display layout for data views. (Display>Layout>A-S-[C] or as desired) Configure scan mode. (Scan>Inspection>Scan>Time) Configure C-scan if used. (Display>View Settings>Category C-scan>Source 1 or 2) Configure display readings. (Measurement>Reading>Measurement Mode) Select indoor\outdoor display scheme. (Preferences>Instrument>Screen) Configure file data settings. (File>Data Settings>Data Settings) Name and save Ops file. �
MX2 Training Program – Manual Inspection – Set UT Reference
Set UT reference to on. (UT>Advanced>Reference>On) When the reference is set to on, the general gain is fixed and an adjustment gain appears to the right of the gain value (6dB below). The gain applied to all focal laws in the group is general gain + adjustment gain (19.5dB + 6.0dB below)
This feature allows the operator an easy way to increase and decrease dB for manual scanning without losing the reference sensitivity for amplitude associated readings.
The reference sensitivity is the level recorded on the calibration block at which flaws are evaluated for a accept\reject decision.
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MX2 Training Program – Manual Inspection – Set Part Thickness
The part thickness was entered during the group set up wizard process and may have been changed to facilitate calibration. Set the part thickness in Probe\Part>Parts>Thickness. The part thickness parameter is only relative to the display skip lines (B0, T1, B2, etc.) and the trigonometry readings such as DA. (Depth of the signal in gate A)
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MX2 Training Program – Manual Inspection – Set Gate Position
After the initial group set up, the gates were most likely repositioned during the calibration processes and must be repositioned for the inspection. Ensure that the complete area of interest within the weld or component is covered by the desired gate. The C-scan data is generated from the gate data only and improper gate placement will result in missed flaws, evaluation of signals outside the area of interest for the inspection, or both.
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MX2 Training Program – Manual Inspection – Set Data View Layout
The layout is the preconfigured arrangement of multiple data views. (A-S-C, A-C-C, etc) Layouts are available in different options for single group and multiple group configurations. The most common for weld inspection is the A-S-C layout for both single probe and multiple probe inspections.
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MX2 Training Program – Manual Inspection – Set Time Scan
For a manual inspection not using an encoder or scanner, the instrument PRF is fixed at 60 Hz until manually changed by the operator or reduced by the software when a condition is changed such as addition of more groups and focal laws.
Select >Scan>Inspection>Type>One line scan. Select >Scan>Inspection>Scan>Time. These are the default values for the MX2 and should not require modification until an encoder or scanner is configured.
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MX2 Training Program – Manual Inspection – Configure Time C-scan
Although the C-scan is not useful for length sizing without use of an encoder it can be extremely useful for detection of defects in some applications, especially where no weld crown and root geometry is present in the data.
When the inspection is set to time as in the previous slide, the C-scan is updated at the speed of the PRF and has no value for length sizing but much value for detection and depth\height sizing in some applications. Turn on the C-scan, select Display>Selection>Show C-scan>On. This is only available when the selected layout contains a [C] for C-scan. (A-S-[C])
Clock C-scan acquisition for shear wave tip diffraction depth\height sizing
C-scan moves with the clock, not encoder �
MX2 Training Program – Manual inspection – Configure C-scan cont.
After turning on the C-scan in the display menu, the C-scan option of A% is displayed. This is the default C-scan and it can be changed in Display>View Settings>Category C-scan>Source 1 or 2. Besides an amplitude C-scan for gate A, other C-scan options include a position Cscan (Thickness), amplitude gate B (B%), amplitude gate I (I%), and crossing position (I/).
Time ��
MX2 Training Program – Manual inspection – Configure C-scan cont. The size or length of the C-scan can be manipulated by changing in the start and end in Scan>Area sub menu. This will directly affect the file size and because an encoder is not used the data is not related to position but used only as a means to store waveforms. The speed at which the C-scan updates can be manipulated by changing the scan resolution in Scan>Area>Scan Resolution. Selecting the Start Inspection button will reset the C-scan and clear all data cached in memory.
Time ��
MX2 Training Program – Manual Inspection – Configure Readings
The MX2 displays two lists of four readings each that are visible at all times when not in full screen mode and used for amplitude, trigonometry, and position data. The readings are available in pre-configured lists based on application and can also be selected individually. These eight readings will appear on the report. Select Measurement>Readings>Measurement Mode and select the list for the desired application. (MX2 default is manual weld)
Application Groups
Pre-configured Readings
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MX2 Training Program – Manual Inspection – Select Display Scheme
If working outdoors or in bright light environments it may be advantageous to change the display to the outdoor scheme. Battery life can also be extended by reducing the screen brightness when possible. Change the display if necessary in Preferences>Instrument>Category>Screen>Scheme>Outdoor.
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MX2 Training Program – Manual Inspection – File Data Settings
Data file settings determine the type of data and the file name format when the save data button is selected. The data file can be configured to save both the A-scan and C-scan data or only the C-scan data in File>Data Settings>Data Selection. If a USB flash memory is installed it will appear in the available storage options in File>Data Settings>Storage. The fastest saving option is use of the micro flash USB memory installed in the USB 2.0 port. The default storage location is the storage card that also contains the system software. Create a file name for the data file that will be saved from the inspection. (This is not the setup file). Any compatible windows file name can be entered. Additionally, use of the following characters will allow incremental numbers, a date, and or the time to be automatically generated with the file name. – # Represents an automatically incremented number. (Example: Data### becomes data001, data002, data003, and so on) – %D Represents the data in the international format. (YYYY-MM-DD) – %T Represents the time in the international format. (HH.MM.SS)
The type of data file that is created when selecting the save data button is selected in File>Data Settings>Save Key. The system default and typical option is data. ��
MX2 Training Program – Manual Inspection – Save .Ops file
Prior to starting the inspection save your current setup file (.Ops file) by selecting File>Setup>Save As and enter a logical name. Creating the file name relative to the probe\wedge\application or with a procedural naming scheme is highly recommended.
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