6inch 168mm ERW High Speed Tube Mill from China Manufacturer

This equipment can produce pipes from the smallest 2 inches 50.8mm to the largest 6 inches 168mm. A set of equipment includes all pipes. Different pipe diameters require different molds.

Customers can choose from a variety of technical styles for this set of equipment, including conventional round to square, direct square for square and rectangular pipes, or FFX flexible molding technology. No matter which option you choose, we can provide a perfect solution.

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Line Specification

Forming Section

Sizing Section

{Steel Tape}→Coil car→ Uncoiler →Peeler and hold down roll→Flattener→ Strip-head Cutter and welder→Spiral accumulator→Forming section（Flattening unit +Main driving unit +Forming unit +Guide unit +squeeze roller）+ De-burr frame →→Cooling unit →→ Sizing unit and straightener →→Cutoff saw →→ Run-out table →→Straingtener machine →→Chamfer machine →→Hydro tester machine →→automatic package machine

Common Issues and Solutions for 168mm Straight Seam Welded Pipe Equipment

Issue 1: Weak Weld Seam or Insufficient Strength

• Possible Causes:

  • Unstable power output or improper frequency matching of the HF welder

  • Misalignment or improper seam formation

  • Worn or misaligned magnetic rod, resulting in poor induction

• Solutions:

  • Check the HF welder output; ensure the power matches pipe size

  • Adjust roll pressure and alignment for proper seam fit

  • Replace or reposition the magnetic rod

Issue 2: Surface Scratches or Dents on the Pipe

• Possible Causes:

  • Roll molds are damaged or contaminated

  • Improper strip guidance causing deviation

• Solutions:

  • Regularly clean and inspect forming and sizing rollers

  • Adjust guide devices to ensure the strip is centered

Issue 3: Ovality or Inconsistent Pipe Dimensions

• Possible Causes:

  • Severe wear on forming tools

  • Uneven sizing pressure or bearing failure

• Solutions:

  • Replace worn molds and realign the forming section

  • Inspect the bearing system and ensure uniform pressure

Issue 4: Uneven or Off-Center Cut by Flying Saw

• Possible Causes:

  • Servo tracking instability

  • Dull or misaligned saw blade

• Solutions:

  • Recalibrate the servo tracking system

  • Replace or properly install the saw blade

Operational Guidelines

1. Ensure steel strip is cleaned and edges are trimmed before feeding to prevent scratches and poor seam formation.

2. Preheat the HF welder and check the cooling water system before operation to maintain proper temperature and flow.

3. Routinely inspect and adjust the magnetic rod to maintain welding efficiency and avoid weak welds.

4. Strictly follow the mold replacement and lubrication schedule to maintain equipment performance and extend service life.

5. Always conduct a dry run of the flying saw before production to confirm tracking accuracy and system response.

6. Perform daily pre-production checks (electrical system, cooling, hydraulic, drive chains, etc.) to identify hidden risks.

7. Record product dimensions and appearance daily to support equipment calibration and parameter optimization.