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並前往https://connect.ncdot.gov/resources/Materials/MaterialsResources/Approved%20Structural%20Steel-Welding%20Procedures%20-%20Single%20V-Groove%20with%20Backing.pdf

north carolina department of transportation single v-groove ...

SINGLE V-GROOVE WITH BACKING. WELDING PROCEDURE SPECIFICATION (WPS) AWS D1.5 ... Weld. Flat, Horizontal, Vertical,. Overhead. Welding Current:.

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