METAL FABRICATION SHOP DOCUMENTATION
Fabrication of main members as defined in the Standard Specification 2408.02,B requires plant inspection by a DOT Materials Fabrication Inspector 2 or their representative. DOT form number 820260 Structural Steel – Fabrication Report is required.
All other metal items as described in IM 557 (except pre-engineered steel truss trail bridges) will require, as a minimum, project site inspection by District Materials personnel using DOT form number 820261 Structural Steel – Project Site Inspection. All Non-destructive testing (NDT) reports shall be submitted to the Central Construction and Materials Office. Inspection by a DOT Materials Fabrication Inspector 2 may be performed for any fabrication when available.
Certifications
For steel items not considered as main members the fabricator shall furnish, on each shipment day, a certified bill of materials or invoice which identifies the county, project number, contractor, and number of pieces. The certification of compliance shall be signed by a designated, responsible company representative and shall be stated as follows:
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"The materials itemized in this shipment are certified to be in compliance with the applicable AASHTO and/or ASTM requirements and Iowa Department of Transportation Standard Plans and Specifications, IMs and meet the Buy America requirements as described in IM 107 for all steel, iron products and coatings."
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Authorized Signature and Date |
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Fabrication Inspection
A copy of material acceptance reports, such as Mill Test Certifications and test reports of material sampled and submitted to the Department of Transportation Materials Laboratory shall be retained in the DOT fabrication inspector 2 (Quality Assurance) records. Records shall be kept of the various phases of shop inspection. Such records shall include the inspection date and the initials of the individual conducting the inspection. All products of iron, steel, or a coating of steel shall meet the requirements of IM 107, Buy America.
A. Heat Numbers & Grades of Steel
Heat numbers found on main members of steel shall be recorded and a checkmark shall be placed by the recorded heat number after acceptability has been verified with the Mill Test Certifications. Grades of steel shall be recorded with the heat number. When plate-testing frequency is required rather than heat testing, the slab or serial number shall be recorded with the heat number.
Heat numbers recorded by the DOT fabrication inspector 2 shall be checked with the fabricator's certified cutting list when that document becomes available.
B. Recording Measurements
After main member structural steel has been measured in accordance with IM 562, the measurements shall be recorded in the following manner:
1. Nominal thickness and width
2. Actual measured thickness and width when these dimensions are less than nominal. If measurements are nominal or above, place a checkmark in the Actual Measurement column.
3. Difference between nominal and actual measurement, if difference is outside tolerance.
C. Weight Computation of Rolled Beams
The weight (mass) of rolled beams shall be computed by the method outlined in IM 562 and the measurements shall be recorded as follows:
1. Theoretical combined average thickness of the web and flanges
2. Measured combined average thickness of the web and flanges (web t + flange t).
3. Difference
4. Percent difference (Maximum - 2.5%)
II. Nondestructive Testing (Magnetic Particle & Radiographs)
The following information shall be retained in the DOT fabrication inspector 2 records:
1. A copy of the document received from the DOT Laboratory accepting the operator's qualifications.
2. A date check on last eye examination (one year limit)
3. A copy of the inspection record furnished by the NDT operator.
4. A record of monitor inspection of the magnetic particle inspection conducted by the qualified operator and the dates, piece numbers and the locations tested.
5. A record of radiograph locations, film interpretation by the shop inspector and the DOT Laboratory approval number.
The DOT fabrication inspector 2 shall record the monitoring of welding inspection to ensure that approved welding procedures are being applied and the welding parameters are within the limitations of variables listed in the American Welding Society (AWS) Code.
Both camber and blocking diagrams shall be tabulated in such a manner that all girders and/or beams in a line will be arranged as they appear in laydown and will include the following information:
1. The calculated or given camber offset dimensions at bearing points, midpoints, and field splice points
2. The actual camber offset readings
3. The difference between the calculated or given camber offset readings and the actual readings
4. Blocking diagram tabulation shall include the blocking offset dimensions at bearing points, midpoints, and field splice points. Any deviations shall be recorded.
The allowable tolerances are shown in IM 564. The disposition of the camber and/or blocking of each line inspected shall be recorded.
The following dimensional locations shall be checked and recorded:
The location of the above details shall be recorded and tabulated on an accumulated dimensional basis starting with a zero reading at the abutment bearing point or hinge bearing point and continuing to the opposite end of the line.
Both the computed dimensional locations and the actual dimensional locations of the above details shall be recorded. When the dimensional location of the various items is found to be within tolerance of the computed dimensions, it shall be noted with a check mark on the check off sheet.
When differences exist between the computed dimension and the actual dimension, the difference between the readings shall be recorded along with a plus or minus sign or with an arrow which shows if the difference is toward or away from the zero reading end.
Record dates of paint inspection and average paint thickness of member inspected. After the final inspection, the inspector shall place a stamp on girders and/or rolled beams, indicating release for shipment. Piece numbers of members stamped shall be recorded.
VII. Record of Discrepancies
All discrepancies found which are outside specification limits, and the corrections of which are not included in the specifications, shall be recorded. Record each discrepancy and the subsequent correction.”
The discrepancies noted above refer to any area of inspection including welding, materials, shop or design.
The following is a list of documents that should become part of the DOT fabrication inspector 2 permanent files during the progression of the fabrication of the structure:
1. Design drawings
2. Proposal
3. Applicable Special Provisions
4. Approved shop drawings including welding procedures
5. Standard Specifications
6. Electrodes are listed in the AWS Code.
7. Prefabrication meeting notes
8. List of qualified welding operators, welders and tack welders (Record should show the type welding, position and expiration date.)
9. Approval of QC Certified Welding Inspector Documentation and approval of NDT Personnel by the Ames Materials Office. (This record should include the operator's latest vision test, one-year limit.)
10. Three copies of Mill Test Certifications of the structural steel.
11. Producer certifications for shear studs and miscellaneous items.
12. A copy of fasteners certifications
13. Material test reports from Ames Laboratory, such as radiographs, paint, casting, charpy v – notch, fasteners, etc.
14. A copy of material identification Form #193, which was submitted with samples, sent to Ames Laboratory for testing.
15. Correspondence pertaining to fabrication of the structure
16. Cutting list from the fabricator certifying the heat number locations
17. NDT inspection records from certified personnel. (Information required on NDT reports outlined in IM 561.)
18. Tensioning bolts according to Turn-of-Nut
In addition to the above records, the following records should be maintained when Fracture Critical Members are included:
19. A copy of Weld Procedure Test observed by the Quality Assurance Inspector.
20. A copy of Welders, Welding Operators and Tackers who are approved for Fracture Critical Welding and a similar record of those approved for non-fracture critical welding.
21. A copy of manufacturer recommended storage methods of welding materials.
22. A copy of manufacturer test results of the electrodes to be used. Certificate of conformance shall be required.
23. A copy of Ultra Sonic test results conducted by the fabricator.
24. A copy of Ultra Sonic test results conducted by the contracting authority (DOT), when required for the project.
25. A copy of test results when other NDT testing is required, such as Liquid Penetrant.
26. A copy of critical and non-critical repair procedures.
27. Record of QC and QA inspector acknowledgements of needed repairs and a copy of sign off record after repairs were completed.
28. A copy of QC-1 Certified Welding Inspector Document.
29. Documentation of approved stud welder operator qualification.
DOT fabrication inspector 2 is to use DOT Form number 820260 for the fabrication report and attach a Bridge Report including the following:
A. Reporting of heat numbers
The following information shall be included when correlating heat numbers of steel for main members to their respective locations in the girder or rolled beam assemblies:
1. Rolled beam or girder number
2. Item (web, flange, cover plate)
3. Description (dimensions)
4. Heat numbers (and slab or serial numbers when required)
5. Other main members (material shall be listed with dimensions and heat numbers)
B. Other materials
The final fabrication report shall include the basis of acceptance of the materials listed below and on the following pages.
1. Hardware
List the Iowa DOT Laboratory number under which the hardware items were approved. When hardware is supplied from stock, list individual sample dates and Iowa DOT Laboratory approval number.
2. Castings
The following information shall be included:
a. Producer
b. Pieces
c. Casting numbers and grades (when available)
d. Inspection office
e. Department of Transportation Laboratory approval numbers (when available)
3. Galvanizing
The following information shall be included in the final report when galvanizing inspection is conducted at the fabricating plant:
a. Galvanizing company
b. Inspector
c. Description of material
d. Approved laboratory numbers when applicable
NOTE: When galvanizing inspection will be required in the field, a statement informing field personnel shall be included in the final report.
4. Shear studs
A statement providing the following information concerning shear stud inspection shall be included in the final report:
a. Producer of the shear studs
b. Acknowledgement of receipt of certification in compliance with the specifications
c. Verification that inspection of welding, spacing, and workmanship was conducted
5. Painting
The final report shall include a statement with the following information pertaining to paint inspection:
a. Paint manufacturer
b. Product name
c. Lot or batch number
C. General Information
A section of general information shall be included in the final report covering the items listed below and on the following page or any other information that is pertinent to the bridge fabrication inspection:
1. Blast Cleaning
A general statement shall be included noting the method of blast cleaning and the specifications required.
2. Welding & Welding Procedures
A statement shall be included in the final report noting that only qualified welders, operators and tackers did the welding or tacking using approved procedures with approved electrodes or wire-flux combinations.
3. Non-destructive Testing
A statement shall be included in the final report noting the extent of non-destructive testing conducted in accordance with specification requirements.
4. Miscellaneous Items
A statement shall be included in the final report noting unusual items not previously covered such as the inspection of canvas, neoprene pads, special expansion assemblies, drains, etc.
D. Design Inspection
The final report shall include a description of the items checked during laydown inspection, and what items remained to be inspected prior to final approval and shipment.
E. Discrepancies
NOTE: All discrepancies found during material, welding, design and shop inspection. Include a statement of corrective action taken and the personnel authorizing such action.