H-beam is an economical section steel, which is mainly divided into two categories: hot-rolled H-beams and Welded H-Beams. It is generally considered that when the section modulus of an H-beam exceeds 10,000, production by welding is more economical than by rolling. There are also many types of H-beams that, despite their relatively small section modulus, are difficult to roll due to their asymmetric cross-sections (e.g., two flanges with different lengths or thicknesses) and are therefore often produced by welding. Compared with the rolling method, the welding method has the advantages of being able to produce various H-beam cross-sections that are hard to roll, featuring flexible production operations and suitability for the market demand of small batches and multiple varieties. Its disadvantages include high metal consumption, high production costs and low output.
The production processes of welded H-beams fall into two types: the continuous type, which uses steel coils as raw materials, and the intermittent type, which uses steel plates as raw materials.
The continuous production process is as follows: Steel strip slitting → Uncoiling → Beveling → Positioning → Welding → Straightening → Cutting → Packaging.
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