Steel Pipe Making Machine

Shijiazhuang Faith Machinery Co., Ltd. has recently expanded its product line with a new generation of steel pipe making machines designed to meet the evolving demands of fabricators in construction, oil and gas, and mechanical engineering sectors. These comprehensive production lines integrate every stage of pipe manufacture—from coil loading to final inspection—into a continuous, automated workflow. This article explores the principal features, process stages, and operational advantages that distinguish the latest offerings from Shijiazhuang Faith Machinery Co., Ltd.

1. Integrated Coil Handling and Feeding
At the front end of the line, a heavy‑duty decoiler and pay‑off carriage system supports coils up to 30 tons. The carriage’s expanding arms adjust automatically to coil inner diameter changes, ensuring constant strip tension and uninterrupted material flow. A dual‑pinch roll entry section guides the strip into the straightening unit, where a combination of horizontal and vertical rollers eliminates residual curvature and stress. This precision feeding mechanism sets the stage for accurate forming and stable welding conditions.

2. Progressive Forming Module
Following material preparation, the strip travels through a modular forming section comprising eight to twelve roll stands. Each stand features adjustable side rolls and hardened guide plates, allowing rapid adaptation to different strip widths and thicknesses. The machine’s rigid welded steel frame ensures minimal deflection, preserving the alignment of forming rolls and maintaining wall thickness tolerance within ±0.1 mm. Field‑replaceable roll cartridges enable quick changeovers when switching between pipe diameters ranging from 20 mm to 219 mm.

3. Welding Technology
Shijiazhuang Faith Machinery Co., Ltd. offers dual welding options—submerged arc welding (SAW) for heavy‑wall tubes and high‑frequency induction welding (HFIW) for thin‑wall applications. In SAW configurations, a single‑wire or dual‑wire flux system delivers full‑penetration welds with consistent bead profiles, while onboard flux recovery minimizes waste. In HFIW setups, an induction coil positioned immediately before the weld rollers heats strip edges, which are then forged together under controlled pressure. Both welding heads feature closed‑loop current and voltage monitoring to maintain uniform heat input across varying material grades.

4. Inline Inspection and Quality Assurance
Quality control is embedded throughout the production line. After welding, ultrasonic testing (UT) modules perform volumetric inspections at rates up to 60 meters per minute, detecting internal flaws such as lack of fusion or inclusions. Simultaneously, eddy‑current probes scan for surface defects, including cracks or laps. Data from these tests are recorded in a central database, enabling full traceability by coil batch and weld location. An automated marking station then imprints heat numbers, wall thickness, and production date onto each pipe segment.

5. Sizing and Cut‑Off Units
Post‑inspection, the pipe enters a sizing module consisting of smoothing rolls and stretch‑forming stands that refine roundness and straightness. Target tolerances of ovality below 1% are routinely achieved, even on high‑strength alloys. Hydraulic flying cutoff saws deliver burr‑free ends by synchronizing blade speed with line speed, supporting cut lengths from 1 meter to 12 meters. Off‑cuts and scrap are automatically conveyed away, minimizing manual handling and improving workplace safety.

6. Automation and Control
A Siemens PLC platform coordinates all line functions, from coil loading and roll pressure to weld parameters and cut‑off timing. Operators interact via an HMI touchscreen that presents real‑time data—coil ID, line speed, strip tension, weld current and voltage, and NDT results. Recipe management allows storage and recall of up to 100 product configurations, reducing setup time between runs. Optional remote access capabilities enable Shijiazhuang Faith’s service engineers to diagnose issues and update software without dispatching field personnel.

7. Maintenance and Support
To maintain high availability, Shijiazhuang Faith Machinery Co., Ltd. supplies a comprehensive spare‑parts kit and recommends preventive maintenance intervals based on operating hours. Critical wear parts—roll guide bushings, mandrel seals, saw blades, and bearing cartridges—are included in the kit. A downloadable maintenance calendar, accessible via the company’s customer portal, reminds operators of scheduled inspections, lubrication points, and calibration checks.

By integrating robust mechanical design, versatile welding options, and thorough quality control, the new steel pipe making machines from Shijiazhuang Faith Machinery Co., Ltd. deliver reliable performance across a broad range of steel grades and pipe dimensions. The end‑to‑end automation reduces operator intervention, supports rapid product changeovers, and ensures consistent compliance with international standards such as ASTM A53, EN 10217, and JIS G3445.