Understanding the Frame Design of FX250 and FX315 in the FUSINGX FX Series
For butt fusion welding machines, the frame structure directly affects stability, alignment, and long-term reliability. Within the FUSINGX FX Series, the FX250 and FX315 use a frame design that is unique to these models, offering advantages specifically suited for medium-diameter HDPE pipe welding.
Round-Edge Steel Tube Frame — Exclusive to FX250 & FX315
Why this design works well for medium diameters
· Steel tubes offer good torsional resistance
· Welded side plates increase overall rigidity
· The structure remains stable during heating, changeover, and joining
· Ideal for frequent field use in 250–315 mm pipe ranges
For medium-size machines, this balance of weight and rigidity helps ensure consistent welding alignment without adding unnecessary mass.
Why Larger Models Use Thick Steel Plates Instead
Reasoning behind the change：
· Larger pipes require higher clamping force
· Thick steel plates distribute stress more evenly
· The structure maintains accuracy under heavier loads
· Better suited for long, high-pressure welding cycles
This is an engineering choice based on load, torque, and frame stiffness requirements—not a downgrade or upgrade, simply the correct structure for the correct size.
Frame Structure Comparison
| Model Range | Frame Type | Key Advantages |
| FX250 / FX315 | Round-edge steel tube + welded plates | High torsional stability, balanced structure, ideal for medium diameters |
| FX355+ | Thickened single steel plate | Greater load capacity, higher rigidity for heavy-duty welding |
Consistent FX Series Engineering
Although the frame form differs by model size, all FX machines follow the same engineering principles:
· Stable guide movement
· Reliable clamping system
· Integrated hydraulic and electrical design
· 1Durable construction for long-term field use
Each machine is assembled and tested to ensure consistent performance across the full FX lineup.
Production Line Snapshot
Recent production batches show multiple FX models—including FX250 and FX315—undergoing assembly and final inspection before shipment.
The workshop views demonstrate our steady production capacity and the structural differences described above.
Welcome to Connect with Us
Welping welcomes customers and partners from around the world to discuss technical requirements, learn more about the FX Series, or visit our facility.
We look forward to sharing more about our manufacturing process and engineering approach.