Extending Bridge Service Life Through Field Welded Repairs and Retrofits (2016) / Chapter Skim
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Pages 18-27
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19 installation, and quality control and quality assurance requirements for field welding projects. The following design requirements were investigated: – Plan and specification preparation, and – Base material properties.
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20 welding currently, allowed field welding previously but do not currently allow it, and which agencies have never allowed field welding. States as far north as Alaska, North Dakota, Minnesota, and Maine allow field welding; there does not appear to be a correlation with lowest anticipated temperatures and general geographic location and the propensity for field welding.
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21 • Expense or time consuming, • Unfamiliarity with process and/or welding, and • Other (please specify)
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22 Field Welding Staff Some agencies may use field welding often enough that they have in-house welders. For other agencies who undertake field welding less often, this may not be economical when compared with hiring an outside contractor to perform these duties.
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23 specification or welding code was "sometimes" required. No agencies reported that they never require such a governing specification or welding code.
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24 • Material samples, • Using date built information, or • Other (specify)
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25 ing on their projects, as shown in Figure 14. Four agencies noted that it was not known whether the welders were certified according to the controlling welding code and one stated that it did not use welders who were certified according to this code.
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26 magnetic particle testing (MT) and subsurface techniques such as ultrasonic testing (UT)
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27 FIGURE 18 NDT required. 6 18% 4 12% 24 70% Had Problems No Problems Unknown FIGURE 19 Agencies with projects that had major problems as a result of being field welded.
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28 SUMMARY Forty-three agencies completed survey responses, an 86% response rate among state DOTs. The primary findings of the survey of the state of practice are summarized as follows: • Seventy-four percent allow planned field welded repairs and retrofits to be performed.
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