Can the production capacity and precision of Used high frequency welded tube mill meet the requirements of modern pipe production?

Publish Time: 2025-10-22

With increasing cost pressures in the manufacturing industry, many small and medium-sized steel pipe manufacturers are turning to Used high frequency welded tube mill equipment, hoping to quickly start production with a relatively low investment. The production capacity and precision of Used high frequency welded tube mill can still meet the stringent requirements of modern pipe production for efficiency, quality, and diversity.

1. Capacity Gap Under Technological Upgrade

Modern high-frequency pipe welding mills have made significant progress in automation, integration, and intelligence. New equipment generally utilizes solid-state high-frequency power supply technology, featuring automatic frequency tracking, closed-loop power control, and a digital human-machine interface. The welding frequency can be intelligently adjusted within a range of 100-450kHz to accommodate the production needs of different materials and wall thicknesses. In contrast, most used equipment still relies on older vacuum tube high-frequency generators or early thyristor technology. Their frequency is fixed or has a limited adjustment range, resulting in welding speeds generally below 60 meters per minute and poor power stability. Furthermore, modern mills are often equipped with computerized fixed-length flying saws, online quality monitoring systems, and automatic roll changing devices, significantly improving overall production efficiency. Secondhand equipment often lacks these automation modules and relies on manual operation. This results in not only low production capacity per unit time but also high downtime and scrap rates due to human error, making it difficult to meet the continuous and efficient operation requirements of modern production lines.

2. Bottlenecks in Precision Control

High precision is a key requirement for modern welded pipe products, especially those used in the automotive, precision machinery, and high-end construction sectors. Precision is reflected not only in the tolerance control of outer diameter and wall thickness, but also in weld quality, straightness, and surface finish. New pipe welding lines have significantly improved the material selection and processing precision of forming and sizing rollers. Combined with a sophisticated roll gap adjustment system and online straightening technology, these units can maintain outer diameter tolerances within ±0.1mm and achieve extremely low weld height. However, secondhand equipment, after long-term use, is generally subject to mechanical wear. For example, increased clearance between the bearings of the flat and vertical rolls can cause misalignment and wavy edges in the pipe billet during the forming process. Furthermore, the welding control system of older equipment lacks sufficient precision in adjusting the angle of contact, input power, and extrusion volume, making defects such as cold welds, overburning, and misaligned edges more likely to occur. Even after repairs, the overall accuracy is difficult to restore to factory standards, significantly compromising the ability to produce high-value-added products.

3. Challenges of Modern Production Demands

Today's market demand for pipes is increasingly diverse, with an increase in small-batch, multi-variety, and customized orders. This requires production lines to be able to quickly change molds and adjust flexibly. Modern high-frequency pipe welding mills, with their modular design and CNC systems, can quickly switch between specifications. However, second-hand equipment is mostly fixed-type, making mold changes cumbersome and time-consuming. Furthermore, it lacks data storage and recall capabilities, requiring re-commissioning for each specification change, resulting in lengthy production preparation times and making it difficult to adapt to the demands of flexible production. Furthermore, modern enterprises have higher requirements for energy efficiency and environmental protection. Newer equipment uses inverter technology, resulting in high energy utilization, while older vacuum tube equipment consumes significant energy, has high operating costs, and exhibits significant electromagnetic interference, making it inconsistent with the trend of green manufacturing.

In summary, Used high frequency welded tube mill lag significantly behind modern advanced equipment in terms of production capacity and precision. Although its initial purchase cost is low, for manufacturing companies pursuing high-quality, high-efficiency and high-value-added products, its hidden losses in operating costs, scrap rates, product competitiveness and customer satisfaction may far exceed the price difference of the equipment.