There are two production methods of H-beam: hot rolling forming and welding compound forming. Welding H-beam is to cut the strip steel with appropriate thickness into appropriate width, and weld the edge and waist together on a continuous welding unit. Welding H-beam has some disadvantages, such as high metal consumption, low production economic benefit, and difficult to ensure uniform product performance. Therefore, the production of H-beam is mainly based on rolling. The main difference between H-beam and ordinary I-beam in rolling is that the latter can be rolled in two-roll pass, while the former needs to be rolled in universal pass. The hot-rolled H-beam produced by near-net shape continuous casting and four-high universal rolling process has the remarkable characteristics of high quality, high efficiency, low consumption and low cost, and has great advantages in improving steel quality and improving economic benefits.

High frequency welding H-beam;

Two shunting end pieces (T-section, H59- 1 brass) and five resistance pieces (thickness 1.5, width 20, length 45, manganese copper plate); In the way of high-frequency heating; Welding with special solder of copper and phosphorus; Requirements: Brazing process ≤ 1min, with emphasis on positioning and welding (gas welding was used in the previous brazing process). Main technical and economic indicators: there is no oxidation on the surface of the product after welding, and the welding quality is higher than that of gas welding; The end piece and the resistor piece are welded reliably without melting deformation; Ensure the resistance performance of the shunt; The production efficiency has been tripled.

The technical characteristics of high frequency welding of light H-beam are: (1) high welding speed, which can reach18-45 m/min; (2) the thermal influence is small, and it is easy to control the deformation of H-beam; (3) H-beams with different material combinations can be welded; (4) Micro-tension production can be realized and welding stress can be reduced. Technical level: (1) high accuracy of section size; (2) Excellent section performance; (3) The section size can be customized according to user's requirements.

Under the same specifications and materials, hot-rolled H-beam can completely replace welded H-beam, and the quality of the former is better than the latter. Generally speaking, in structural design, hot-rolled H-beam should be used for multi-storey buildings, and welded variable cross-section H-beam is better for light steel workshops with portal frame structure, but the project cost can not be saved much. The reason is that the processing capacity of hot-rolled H-beam is small and the construction period is slightly shorter. If the comprehensive economic benefits (including after the project is put into use) are calculated, if the construction period plays a decisive role, hot-rolled H-beam can be selected, but when the construction period is not required.