Hot-rolled H-beams are formed by passing steel billets through rollers at high temperatures (over 1000°C), shaping the H-section in one continuous process. This method creates uniform grain structure, enhancing strength and consistency, with flanges and web integrally connected. They are cost-effective for standard sizes. Welded H-beams, by contrast, are fabricated by cutting steel plates into flanges and a web, then welding them together. This allows custom sizes for unique projects but introduces potential weak points at welds, requiring strict quality control. Welded beams are often lighter but less robust than hot-rolled ones, suitable for lighter loads or non-critical structures. The choice depends on project specs: standard applications favor hot-rolled, while customization needs lean toward welded.