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Boiler repair in the United States is governed by the National Board of Boiler and
Pressure Vessel Inspectors and the ASME under a classification called R Stamp Welding.
In order to perform R Stamp welds and repairs, boilermakers are tested and certified in the
quality of their weld joints through a rigorous testing procedure.
The name of the certificate comes from the fact that certified welders are issued a steel
stamp that they actually hammer into their work, a logo consisting of the letter R surrounded by a cloverleaf design.
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