Following material preparation, the next challenge is ensuring the production line runs smoothly without interruption. The steps of uncoiling, end joining, and looping storage bridge this transition from raw strip to pipe formation.
Uncoiling & End Joining: Linking One Coil to the Next
Because each coil has a limited length, the strip must be joined to the next coil to support uninterrupted production. This is achieved through a precise coil-to-coil welding process.
A loading car brings the slit coil to the uncoiler, which unwinds and levels the strip. Positioning systems ensure perfect alignment at the coil ends. Welding is then performed using CO₂ gas-shielded arc welding or submerged arc welding, depending on strip thickness.
At Huayang, the end joining section is equipped with automated alignment systems and experienced welders. Every weld undergoes non-destructive testing, such as ultrasonic inspection, to ensure strength and weld integrity. A bad joint can disrupt the entire production process - our team ensures that doesn't happen.
Looping/Accumulator System: The Hidden Key to Continuous Flow
After welding, the joined strip enters a looping accumulator - essentially a U-shaped buffer zone where strip steel is temporarily stored. This section acts as a shock absorber between the stop-start uncoiling section and the continuously running pipe forming line.
The accumulator allows the forming line to run uninterrupted, even while a new coil is loaded and welded at the front. At Huayang, we use automatic tension control systems to keep strip tension and alignment stable throughout.
If the strip is too tight, it may deform. If too loose, it may wander or wrinkle. Our real-time monitoring ensures that strip steel feeds smoothly and consistently, protecting both equipment and material.
