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Experimental investigation reveals laser cleaning optimizes conservation and structural integrity of bridge steels.
• Nanosecond laser cleaning on Sydney Harbour Bridge steels was investigated. • Laser-induced changes were found as deep as 100 µm beneath the surface. • Recrystallisation and increased hardness were observed at the ablated surface. • High tensile residual stresses were induced at the steel surface by the current laser settings. • For conservation and structural integrity purposes, laser parameter optimization is essential.
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Tu et al. (2026) studied this question.
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