Visual examination of weld joint is an important activity, carried out to check the integrity and soundness of the weldment. It is an economical activity, as it doesn't require any costly equipment. It must be carried out by a well experienced inspector. Main responsibilities of a welding inspector are:
- Welding Inspection Acceptance Criteria Template
- Visual Weld Inspection Acceptance Criteria Aws D1.1
- Visual Weld Inspection Acceptance Criteria Asme B31.3
This acceptance of the WQCP may require OSM personnel to witness the welder(s) welding test plates and the testing of those plates before accepting the WQCP. The same is true of the PQR. C) Remind the contractor to provide adequate notice prior to starting any welding work (request one week minimum advance notice). Stage 1 - Welding Inspection Prior to Welding Work Welding symbols and weld sizes clearly specified in drawing and related documents. Weld joint designs and dimensions clearly specified in drawings and related documents. Weld maps identify the welding procedure specification (WPS) to be used for specific weld joints. As per ASME B31.3 Table 341.3.2 Acceptance criteria for welds, is it important to meet all the acceptable values mentioned in the criteria. Lack of root penetration for Normal and Category M fluid - Girth, Miter groove and branch connection shows B as acceptance criteria. Notation B has two acceptable values in the table.
- Code compliance
- Workmanship control
- Documentation Control
The requirements of visual examination are:
- Illumination should be at least 350 Lux (minimum) but it is recommended to carry out visual inspection at an illumination of more than 500 Lux.
- The inspectors eye should be within the radii of 600 mm of the surface of item being inspected and the viewing angle must not be less than 30 degrees.
(Also read Thickness range for welder qualification test)
Other aids which may be required during visual examination are:
- Welding gauges (Figure 2a and 2b)
- Weld gap gauges
- Linear misalignment gauges (Hi-Low)
- Magnifying glass (X2 to X5)
- Mirrored boroscope or fibre optic viewing system (when access is restricted)
Visual inspection can be done at three stages;
- Before welding,
- During welding and
- After welding
Before Welding: The inspector shall be familiarized with the applicable codes and standards/drawings/welding procedures (WPS and PQR). Welder qualification shall be carried out before production welding. The inspector shall confirm the material and review the MTC. Welding consumables shall also be inspected before welding. Joint preparation and alignment shall also to be checked prior to welding. After confirmation of all the parameters (as mentioned above), the welding inspector can permit the welder to start the production welding. If preheat is applicable, then the preheat temperature shall be confirmed before starting the weld.
(Figure 3 shows improper groove face and root gap, a welding inspector must see the groove preparation and root gap before welding)
During Welding: The inspector shall check the welding process and welding parameters with respect to the welding procedure specification (WPS) at any time during welding. Root run and root run dressing, interpass temperature shall be witnessed by the inspector. The welding consumables shall also be checked during welding.
(Also read How to write a welding procedure specification – WPS)
After welding: After complete welding, identification number is punched near joint. Complete visual inspection is done and any surface breaking or defect shall be repaired as per approved procedure. Following defects (or discontinuity) can be revealed by visual inspection:
PreSonus Studio One 3 Professional Crack Keygen ( v3.5.1 ) Final is an awesome sound handling programming intended for music author and sound editors to make and record top notch music tracks. What is Exactly PreSonus Studio One 3? It is a new music creation and production application for Windows 7/8/ or 10 that makes audio recording, MIDI sequencing, and audio mastering simple right. Presonus studio one 3 keygen download. Presonus Studio One 3 Pro Crack Patch Keygen Free Download. PreSonus Studio One 3 Pro Crack Patch Keygen Final is an awesome sound handling programming intended for music author and sound editors to make and record top notch music tracks. This virtual music studio stage is an in with no reservations one sound studio for songwriting, astonishing.
(Figure 4: Welding inspector checking the weld reinforcement size by a Bridge Cam welding Gauge)
The requirements of visual examination are:
- Illumination should be at least 350 Lux (minimum) but it is recommended to carry out visual inspection at an illumination of more than 500 Lux.
- The inspectors eye should be within the radii of 600 mm of the surface of item being inspected and the viewing angle must not be less than 30 degrees.
(Also read Thickness range for welder qualification test)
Other aids which may be required during visual examination are:
- Welding gauges (Figure 2a and 2b)
- Weld gap gauges
- Linear misalignment gauges (Hi-Low)
- Magnifying glass (X2 to X5)
- Mirrored boroscope or fibre optic viewing system (when access is restricted)
Visual inspection can be done at three stages;
- Before welding,
- During welding and
- After welding
Before Welding: The inspector shall be familiarized with the applicable codes and standards/drawings/welding procedures (WPS and PQR). Welder qualification shall be carried out before production welding. The inspector shall confirm the material and review the MTC. Welding consumables shall also be inspected before welding. Joint preparation and alignment shall also to be checked prior to welding. After confirmation of all the parameters (as mentioned above), the welding inspector can permit the welder to start the production welding. If preheat is applicable, then the preheat temperature shall be confirmed before starting the weld.
(Figure 3 shows improper groove face and root gap, a welding inspector must see the groove preparation and root gap before welding)
During Welding: The inspector shall check the welding process and welding parameters with respect to the welding procedure specification (WPS) at any time during welding. Root run and root run dressing, interpass temperature shall be witnessed by the inspector. The welding consumables shall also be checked during welding.
(Also read How to write a welding procedure specification – WPS)
After welding: After complete welding, identification number is punched near joint. Complete visual inspection is done and any surface breaking or defect shall be repaired as per approved procedure. Following defects (or discontinuity) can be revealed by visual inspection:
PreSonus Studio One 3 Professional Crack Keygen ( v3.5.1 ) Final is an awesome sound handling programming intended for music author and sound editors to make and record top notch music tracks. What is Exactly PreSonus Studio One 3? It is a new music creation and production application for Windows 7/8/ or 10 that makes audio recording, MIDI sequencing, and audio mastering simple right. Presonus studio one 3 keygen download. Presonus Studio One 3 Pro Crack Patch Keygen Free Download. PreSonus Studio One 3 Pro Crack Patch Keygen Final is an awesome sound handling programming intended for music author and sound editors to make and record top notch music tracks. This virtual music studio stage is an in with no reservations one sound studio for songwriting, astonishing.
(Figure 4: Welding inspector checking the weld reinforcement size by a Bridge Cam welding Gauge)
A dimensional survey shall be done to ensure the dimension of the part after welding. After satisfactory completion of welding proper documentation is prepared.
If a Post weld treatment is specified in WPS, Then the operation should be monitored and documented. Following parameters to be considered when Post weld heat treatment is required,
- Area to be heated
- Heating and cooling rates
- Holding temperature and duration
- Temperature distribution
In addition to visual inspection, a number of other NDT (Non Destructive Test) methods are available to check the quality of weldment, some of the most common NDT methods are;
Welding Inspection Acceptance Criteria Template
- Magnetic particle testing (MT)
- Electromagnetic testing (ET)
- Acoustic emission testing (AET)
Each NDT methods has its own significance and importance for example Liquid penetrant testing is very efficient and economical for checking surface defects, whereas, with the help of Ultrasonic test and Radiography test, entire depth of the weld can be inspected.
Visual Weld Inspection Acceptance Criteria Aws D1.1
Selection of NDT methods depend on the requirements. Person engaged or assigned to carry out these tests must possess the necessary qualification. A written test procedure, format for reporting and the applicable code must also be decided before conducting the examination.
Also read P-number, F-number and A-number in welding (ASME Section IX)
Visual Weld Inspection Acceptance Criteria Asme B31.3
Note: I had written this article for India welds newsletter- Vol 1:4 Oct-Dec 2018. Click here to read that newsletter.
