What is the purpose of a 'temper bead welding' technique when PWHT cannot be performed on an in-service API 653 tank?
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A
To increase deposition rate and reduce welding time
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B
To refine and temper the HAZ grain structure using the heat from successive weld passes, substituting for furnace PWHT
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C
To apply multiple weld beads for cosmetic appearance improvement
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D
To prevent porosity by controlling travel speed on each pass