This paper presents the testing process of continuous welding for thin-walled H-beams using two sets of solid-state high-frequency power sources, with capacities of 60kW and 400kHz. The test material used was a 2mm-thick ordinary strip steel, which was welded using both asymmetric and symmetric methods. After analyzing the results, it was concluded that the symmetric welding process is more suitable for the production of thin-walled H-beams due to its superior stability and weld quality.
1. Introduction
H-shaped steel consists of an upper flange, a web, and a lower flange, as illustrated in Figure 1. In this welding process, one solid-state high-frequency power source is used to heat and weld the upper flange and the web, while another solid-state high-frequency power source handles the lower flange and the web. Both systems operate simultaneously and continuously, ensuring efficient and consistent welding performance.
The dimensions of the thin-walled H-beam are shown in Figure 2. For the contact welding test, the welding head design is displayed in Figure 3. The contact tip is made of pure copper, measuring 20mm by 8mm, with a contact surface area of 160mm². The cylinder has an inner diameter of 30mm, providing a contact area of 700mm². The air compressor pressure is set at 2kg/cm², and the contact force applied to the strip is calculated as 7cm² × 2kg/cm² = 140N·m.
For more detailed information, please refer to the attached content or consult the 18th issue of Metalworking (Hot Processing).
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