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【概要描述】Similarities and Differences Between Used Welded Pipe Mills and Used Direct Forming Square Pipe Mills 1. Basic Overview Used welded pipe mills and used direct forming square pipe mills are both metal tube processing equipment, primarily used to transform steel strips or plates into pipes of varying shapes through forming and welding processes. These second-hand machines are popular in the market due to their lower costs, making them suitable for small and medium-sized manufacturers. However, they differ significantly in structure, technology, and application. 2. Similarities (1) Shared Core Processes Forming & Welding: Both use roll-forming technology to gradually bend steel strips into circular or square shapes, with seams joined by high-frequency welding (HFW) or other methods. Common Issues in Used Equipment: Due to prolonged use, both may suffer from roller wear, electrical system degradation, or unstable welding performance, requiring thorough inspection before operation. (2) Overlapping Applications Construction: Producing scaffold tubes, structural pipes, etc. Furniture Manufacturing: Fabricating metal frame components. Machinery Industry: Making conveyor pipes or mechanical parts. (3) Similar Maintenance Needs Roller Maintenance: Regular checks for wear to prevent dimensional inaccuracies. Welding Quality Control: Adjust current, voltage, and speed to ensure seam strength. Lubrication System Care: Used machines often have clogged or leaking systems, requiring frequent cleaning and oil replacement. 3. Differences (1) Forming Methods & Final Products Aspect Used Welded Pipe Mill Used Direct Forming Square Pipe Mill Product Shape Primarily produces round/oval pipes Directly forms square/rectangular tubes Forming Process Multi-pass roll bending for circular shaping Special roll design for direct squaring Tooling Requirements Requires different rollers for varying diameters Needs dedicated square-forming dies (2) Structure & Adjustment Complexity Used Welded Pipe Mill: Simpler structure, easier adjustments, suitable for multi-size round pipes. Used machines may suffer from roller misalignment, requiring frequent calibration. Used Direct Forming Square Pipe Mill: More complex, demanding precise corner formation with high roller coordination. Worn dies in used equipment can cause corner cracks or collapse. (3) Welding Variations Round Pipes: Straight seams allow even heat distribution; aging HF generators may weaken welds. Square Pipes: Corner welding is challenging, requiring higher power; insufficient output leads to weak joints. (4) Market Suitability Used Welded Pipe Mill: Broadly applicable (e.g., water/gas pipes), with stable demand. Used Direct Forming Square Pipe Mill: Focused on construction/furniture sectors; precision issues may affect straightness. 4. Key Considerations When Purchasing Used Equipment (1) General Advice Inspect Core Components: Prioritize rollers, welding heads, and drive systems. Test Run: Produce sample tubes to check tolerances and weld quality. Spare Parts Availability: Ensure compatible rollers/dies are still obtainable. (2) Specific to Welded Pipe Mills Prefer units retired within 5 years to avoid excessive HF welding system decay. (3) Specific to Direct Forming Square Pipe Mills Must examine corner-forming die wear; budget for repairs if needed. 5. Conclusion While used welded pipe mills and used direct forming square pipe mills share fundamental processes, the latter demands higher precision due to specialized forming. Buyers should evaluate based on product needs and rigorously assess used equipment to ensure production efficiency. For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier：www.usedpipemill.com JinYuJie-Used Pipe Mills Supplier（Please click the link→) :second-hand pipe mill