Sharing China-Made with Global Customers
Sharing China-Made with Global Customers
High-Frequency Welded (HFW) pipes are widely used in various industries due to their excellent strength and reliability. Understanding the key factors that influence the quality of HFW pipe is crucial for manufacturers and end-users alike. In this article, we will explore the critical aspects of HFW pipe production, helping you ensure high-quality, durable pipes.
The opening angle refers to the angle between the edges of the pipe billet before it passes through the forming rollers. This angle significantly affects the stability of the welding process and the final weld quality.
· Smaller Opening Angle: Reduces the distance between edges, enhancing the proximity effect, which increases the edge heating temperature and allows for faster welding.
· Too Small Opening Angle: If the angle is excessively small, the meeting point of the edges moves away from the roller centerline, causing the edges to be welded below the optimal temperature. This results in lower weld quality and higher energy consumption.
Practical experience shows that adjusting the longitudinal position of movable guide rollers can control the opening angle, typically ranging from 2° to 6°. When the guide rollers cannot be adjusted longitudinally, modifications can be made using the thickness of guide rings or the shape of the closing hole.
The placement of the inductor (heating coil) relative to the roller centerline greatly affects weld quality.
· Too Far from Centerline: Extends heating time and widens the heat-affected zone, which can weaken the weld strength.
· Too Close: Insufficient heating of the edges also lowers weld strength.
The optimal position is to align the inductor concentrically with the pipe, with the front end approximately equal to or slightly less than the pipe diameter (1.5 times for small-diameter pipes).
The impedance rod (magnetic bar) impacts both welding speed and weld quality. Studies and production experience show that placing the rod's front end at the roller centerline provides the best expansion and flattening strength. Proper placement ensures that the edges are welded evenly and consistently.
The geometry of the pipe billet, including width and thickness tolerances, affects edge heating and extrusion. High-quality HFW pipe production requires billets that strictly meet these standards.
· Edge Defects: Warping, camber, or wrinkling in the pipe billet can cause misalignment in the forming machine, leading to bending or twisting of the strip.
· Roller Adjustment: Poor roller settings can also cause the strip to run off-center, resulting in weld defects or even making welding impossible.
Producing high-quality HFW pipe requires attention to every detail—from opening angle and inductor placement to impedance rod positioning and billet geometry. By following these best practices, manufacturers can ensure consistent weld strength, optimal production efficiency, and long-lasting pipe performance.
If you are looking for reliable HFW pipe solutions, understanding these key technical factors will help you make informed decisions and avoid common production pitfalls.
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