The examination and fix of 20 internal welds at the base of the 525-foot-tall tower of the $6.4 billion San Francisco-Oakland Bay Bridge in California continues. Inspectors are using an ultrasound machine, handheld transducer probe and lubricating gel to scan for cracks, bubbles or other flaws in the "4-inch thick welded vertical joints between the base's steel shear plates and stiffeners." Meanwhile, the steel fasteners and bolt test results are "going really well" so far, says Brian Maroney, Caltrans' chief engineer for the project.

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