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This document provides an overview of the requirements of Welding Requirements CSA-B354.5 – Mast-climbing work platforms with respect to welding. It is designed to specify the requirements for design, manufacturing, remanufacturing, rebuilding/ reconditioning, testing, performance, inspection, training, and maintenance for mast-climbing work platforms that are primarily used to provide a working surface for personnel, along with their necessary tools and materials, at elevated work locations.