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Shijiazhuang Faith Machinery Co., Ltd. focuses on the engineering and manufacturing of high quality ERW (Electric Resistance Welded) tube mills, where the primary objective is to achieve consistent dimensional accuracy and weld integrity. The concept of quality in this context is defined by repeatable performance and adherence to specified technical parameters throughout continuous production runs.
The foundation for quality begins with the mill's structural design. The frame is constructed from high-grade steel with reinforced cross-sections to provide significant torsional rigidity. This minimizes deflection under the high radial forces encountered during the forming and sizing processes, which is a fundamental requirement for maintaining consistent tube geometry. The forming and sizing sections utilize a generous number of stands, each equipped with precision-machined rolls. These rolls are manufactured from selected alloy steels and undergo heat treatment to achieve a high surface hardness, which resists wear and maintains their critical profile over extended periods.
The heart of the ERW process is the welding system. For a high quality mill, a solid-state high-frequency welding unit is typically employed. Its importance lies in providing a stable and controllable energy output. Consistent power delivery is crucial for creating a uniform heat-affected zone along the entire length of the strip edges, resulting in a homogeneous weld seam. Following welding, the controlled heat treatment of the weld zone is integral. An inline normalization system subjects the weld to a specific thermal cycle, which refines the grain structure and ensures the mechanical properties of the weld are comparable to those of the parent metal.
Quality assurance is embedded directly into the production line. Non-destructive testing (NDT) methods, such as ultrasonic flaw detection, are often integrated to perform a 100% inspection of the weld seam in real-time. This allows for the immediate identification and segregation of any section with an imperfection. Furthermore, laser micrometers or other optical measuring systems can be installed after the sizing section to provide continuous feedback on the tube's outer diameter and ovality, ensuring they remain within the defined tolerance band.
A high quality ERW tube mill from Shijiazhuang Faith Machinery is therefore characterized by its robust construction, precision components, stable welding process, and integrated monitoring systems. This comprehensive approach is designed to produce tubes that meet stringent specifications for applications in automotive structures, precision mechanical components, and other industries where reliable performance is determined by strict geometric and metallurgical standards.
