|
conforming to Figure 5.3 shall be conducted using the welding electrical parameters that were established for the
<br /> test conducted conforming to Figure 5.1. The ranges of welding electrical parameters established during welding
<br /> per Figure 5.1 in conformance with AWS D1.5, Section 5.12, shall be further restricted according to the limits in
<br /> Table 5.3 during welding per Figure 5.3.
<br /> C. Multiple zones within a weld joint may be qualified. The travel speed, amperage,and voltage values that are used
<br /> for tests conducted per AWS D1.5 Section 5.13 shall be consistent for each pass in a weld joint,and shall in no case
<br /> vary by more than±10 percent for travel speed,±10 percent for amperage, and t7 percent for voltage as measured
<br /> from a predetermined target value or average within each weld pass or zone. The travel speed shall in no case vary
<br /> by more than t15 percent when using submerged arc welding.
<br /> D. For a WPS qualified in conformance with AWS D1.5 Section 5.13,the values to be used for calculating ranges for
<br /> current and voltage shall be based on the average of all weld passes made in the test. Heat input shall be calculated
<br /> using the average of current and voltage of all weld passes made in the test for a WPS qualified in conformance with
<br /> Section 5.12 or 5.13.
<br /> E. Macroetch tests are required for WPS qualification tests,and acceptance shall be per AWS D1.5 Section 5.19.3.
<br /> F. When a nonstandard weld joint is to be made using a combination of WPSs,a test conforming to Figure 5.3 may be
<br /> conducted combining the WPSs to be used in production, provided the essential variables, including weld bead
<br /> placement,of each process are limited to those established in Table 5.3.
<br /> G. Prior to preparing mechanical test specimens, the PQR welds shall be inspected by visual and radiographic tests.
<br /> Backing bar shall be 75 mm in width and shall remain in place during NDT testing. Results of the visual and
<br /> radiographic tests shall comply with AWS D1.5 Section 6.26.2, excluding Section 6.26.2.2. Test plates that do not
<br /> comply with both tests shall not be used.
<br /> WELDING QUALITY CONTROL
<br /> Welding quality control shall conform to the requirements in the AWS or other specified welding codes, the Standard
<br /> Specifications,and these special provisions.
<br /> Unless otherwise specified, welding quality control shall apply when any work is welded in conformance with the
<br /> provisions in Section 49,'Tiling," Section 52,"Reinforcement," or Section 55, "Steel Structures," of the Standard
<br /> Specifications.
<br /> All welding will require inspection by the Engineer. The Contractor shall request inspection at least 3 working days
<br /> prior to the beginning of welding for locations within California and 5 working days for locations outside of California. The
<br /> Contractor shall request inspection at:
<br /> http://www.dot.ca.gov/hq/esc/Translab/smbforms.htm
<br /> Continuous inspection shall be provided when any welding is being performed. Continuous inspection, as a minimum,
<br /> shall include having a QC Inspector within such close proximity of all welders or welding operators so that inspections by the
<br /> QC Inspector of each welding operation at each welding location does not lapse for a period exceeding 30 minutes.
<br /> When joint weld details that are not prequalified to the details of Section 3 of AWS DI.I or to the details of Figure 2.4 or
<br /> 2.5 of AWS D1.5 are proposed for use in the work, the joint details, their intended locations, and the proposed welding
<br /> parameters and essential variables, shall be approved by the Engineer. The Contractor shall allow the Engineer 2 weeks to
<br /> complete the review of the proposed joint detail locations. In the event the Engineer fails to complete the review within the
<br /> time allowed, and if, in the opinion of the Engineer, completion of the work is delayed or interfered with by reason of the
<br /> Engineer's delay in completing the review, the Contractor will be compensated for any resulting loss, and an extension of
<br /> time will be granted, in the same manner as provided for in Section 8-1.09, "Right of Way Delays," of the Standard
<br /> Specifications. Upon approval of the proposed joint detail locations and qualification of the proposed joint details, welders
<br /> and welding operators using these details shall perform a qualification test plate using the WPS variables and the joint detail
<br /> to be used in production. The test plate shall have the maximum thickness to be used in production and a minimum length of
<br /> 460 mm. The test plate shall be mechanically and radiographically tested. Mechanical and radiographic testing and
<br /> acceptance criteria shall be as specified in the applicable AWS codes.
<br /> The Engineer will witness all qualification tests for WPSs that were not previously approved by the Department. Unless
<br /> otherwise specified,an approved independent third party will witness the qualification tests for welders or welding operators.
<br /> The independent third party shall be a current CWI and shall not be an employee of the contractor performing the welding.
<br /> The Contractor shall allow the Engineer 2 weeks to review the qualifications and copy of the current certification of the
<br /> independent third party. In the event the Engineer fails to complete the review within the time allowed,and if,in the opinion
<br /> of the Engineer, completion of the work is delayed or interfered with by reason of the Engineer's delay in completing the --
<br /> review, the Contractor will be compensated for any resulting loss, and an extension of time will be granted, in the same
<br /> manner as provided for in Section 8-1.09,"Right of Way Delays,"of the Standard Specifications. The Contractor shall notify
<br /> Contract No. 10-OM7104
<br /> 130
<br />
|