Product Introduction
Steel Pipe Forming & Welding & Sizing Section
Tube Mill Forming Section
Coils are continuously formed into open seam tubular shape before welding. In-house roll tooling design with COPRA Roll Form Software and experienced design engineer ensures optimum forming pass with smooth material flow throughout the forming process. It is important to ensure coil edges are evenly formed to ensure accurate weld seam presentation at weld rolls. Forming section consists of entry side guide, flattener, breakdown section, cluster rolls and fin pass section. Mill stand constructions are heavy-duty and precision-machined to ensure mill accuracy and reliability.
Forming Unit
Tube Mill Welding Section
Weld section consists of seam guide stand, squeeze roll stand, bead scarfing, seam ironer, cooling tank and optional internal bead scarfing. Where necessary, a de-twisting stand can be installed between the cooling tanks which allow seam adjustment before sizing, especially for square and rectangular tubes.
Squeeze roll stand constructions are heavy duty and precision-machined to withstand the heavy separating force at weld area, yet with high precision for even the finest adjustments.
The proper welding section set-up and arrangement in relation to induction welding are important to ensure effective and efficient welding operation. Squeeze roll diameter, seam guide, welding coil, impeder and impeder cooling affects the rapid heating of the strip edge to be welded, specifically critical for small tube induction welding below diameter 12.7 mm.
Squeeze roll stand constructions are heavy duty and precision-machined to withstand the heavy separating force at weld area, yet with high precision for even the finest adjustments.
The proper welding section set-up and arrangement in relation to induction welding are important to ensure effective and efficient welding operation. Squeeze roll diameter, seam guide, welding coil, impeder and impeder cooling affects the rapid heating of the strip edge to be welded, specifically critical for small tube induction welding below diameter 12.7 mm.
Welding Unit
Tube Mill Sizing Section
Welded pipe passes through the sizing section to uniformly reduce the OD and perfect its roundness to the required tolerance. For square and rectangular pipe, sizing stands gradually shape the tube to the required shape and tolerance. Sizing section consists of driven sizing stand, side roll stand and turk head. For smaller tube, additional straightener is provided to reduce the material stress to ensure final product straightness. Both driven sizing stand and side roll stand are of similar design and made of heavy-duty construction similar to forming stand. The final pass will be the turk head which controls the final shape, tolerance and straightness of the pipe before cut-off.
Sizing Unit
Video
Product Features
 | Durable And Non-deformed Machine Base Use thick steel to weld together as a whole to tempering more than 4 hours twice to make sure that the machine can be used in long term without deformation. |
| Stable Transmission System Spiral bevel gear, drum gear coupling and carburization and quenching for gear teeth makes the driving system stable, efficient and wearable, with higher loading capacity and lower noise |  |
 | Long Bearing Life Equipped with greasing nozzles for the bearing lubrication, the bearing life is largely improved |
| Automatic Roller Quick Change System Online and automatic roller quickly change system, change roller in 10 minutes, resume production in 20 minutes |
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Technical Parameters
| Model | Tube O.D. (mm) | Wall Thickness (mm) | Square/Rectangle (a:b≤2:1，mm) | Wall Thickness (mm) | Speed (m/min) | Main motor （KW） | H.F. Welder （Kw） |
| VZH-12 | Ø4～Ø12 | 0.2～0.5 | // | // | 30～120 | 15 | 100 |
| VZH-16 | Ø6～Ø16 | 0.2～0.8 | // | // | 30～120 | 22 | 100 |
| VZH-20 | Ø7～Ø20 | 0.2～1.0 | // | // | 30～120 | 30 | 100 |
| VZH-25 | Ø9～Ø25.4 | 0.25～1.2 | // | // | 30～120 | 37(or 22*2) | 100 |
| VZH-32 | Ø10～Ø32 | 0.25～1.5 | 8×8～25.4×25.4 10×6～31.8×19.1 | 0.25～1.2 | 30～120 | 45(or 30*2) | 100 |
| VZH-32z | 0.5～2.0 | 0.5～1.5 | 30～100 | 55(or 37*2) | 100 | ||
| VZH-40 | Ø12.7～Ø40 | 0.3～1.8 | 10×10～31.8×31.8 20×10～40×20 | 0.3～1.5 | 30～110 | 75 | 150 |
| VZH-40z | 0.6～2.0 | 0.6～1.5 | 30～100 | 45*2 | 150 | ||
| VZH-50q | Ø16～Ø50.8 | 0.4～1.5 | 12.7×12.7～40×40 20×10～50×25 | 0.4～1.2 | 30～110 | 90 | 150 |
| VZH-50 | 0.5～2.0 | 0.5～1.5 | 30～90 | 45*2(or 110) | 200 | ||
| VZH-50z | 0.7～2.5 | 0.7～2.0 | 30～80 | 55*2 | 200 | ||
| VZH-63q | Ø19.05～Ø63.5 | 0.6～2.0 | 15×15～50×50 20×10～60×30 | 0.6～1.5 | 30～90 | 132(or 55*2) | 150 |
| VZH-63 | 0.7～3.0 | 0.7～2.5 | 30～80 | 75*2 (or 132) | 200 | ||
| VZH-63z | 0.8～3.5 | 0.8～3.0 | 20～70 | 90*2 | 200 | ||
| VZH-76q | Ø25.4～Ø76.2 | 0.8～2.5 | 20×20～60×60 30×15～80×40 | 0.8～2.0 | 30～90 | 160（75*2） | 200 |
| VZH-76 | 0.8～3.5 | 0.8～3.0 | 30～80 | 90*2 | 250 | ||
| VZH-76z | 0.8～4.0 | 0.8～3.5 | 20～70 | 300 | |||
| VZH-90q | Ø30～Ø90 | 0.8～3.0 | 25×25～70×70 30×20～80×40 | 0.8～2.5 | 30～90 | 180(or 90*2) | 250 |
| VZH-90 | 0.8～3.5 | 0.8～3.0 | 30～80 | 110*2 (or 132*2) | 250 | ||
| VZH-90z | 1.0～4.0 | 1.0～3.5 | 20～70 | 300 | |||
| VZH-100q | Ø31.8～Ø101.6 | 1.0～3.0 | 25×25～80×80 30×20～100×50 | 1.0～2.5 | 30～90 | 200(or110*2) | 250 |
| VZH-100 | 1.0～3.75 | 1.0～3.25 | 30～80 | 110*2 | 300 | ||
| VZH-100z | 1.0～4.0/4.25 | 1.0～3.5 | 20～70 | 132*2 | 300 | ||
| VZH-114q | Ø35～Ø114.3 | 1.0～3.0 | 30×30～90×90 40×20～120×60 | 1.0～2.5 | 20～80 | 110*2 | 300 |
| VZH-114 | 1.2～4.5 | 1.2～4.0 | 20～70 | 132*2 | 350 | ||
| VZH-114z | Ø40～Ø114.3 | 1.2～5.0 | 1.2～4.5 | 15～60 | 350 | ||
| VZH-127q | Ø40～Ø127 | 1.2～3.5 | 40×40～100×100 60×30～120×80 | 1.2～3.0 | 20～70 | 350 | |
| VZH-127 | 1.5～5.0 | 1.5～4.5 | 15～60 | 160*2 | 400 | ||
| VZH-127z | Ø50～Ø127 | 1.5～5.5 | 1.5～5.0 | 10～45 | 400 | ||
| VZH-140q | Ø50～Ø141.3 | 1.2～4.0 | 50×50～110×110 60×40～150×75 | 1.2～3.5 | 15～60 | 400 | |
| VZH-140 | 1.5～5.5 | 1.5～5.0 | 10～50 | 180*2 | 400 | ||
| VZH-140z | Ø60～Ø141.3 | 2.0～6.0 | 2.0～5.5 | 10～40 | 500 | ||
| VZH-168q | Ø60～Ø168.3 | 1.5～5.0 | 60×60～130×130 80×40～160×80 | 1.5～4.5 | 10～50 | 400 | |
| VZH-168 | 2.0～6.0 | 2.0～5.5 | 10～50 | 200*2 | 500 | ||
| VZH-168z | Ø76.2～Ø168.3 | 2.5～8.0 | 2.5～7.0 | 10～40 | 200+132*2 (or 132*4) | 600 | |
| VZH-219q | Ø89.1～Ø219.1 | 2.0～6.0 | 70×70～160×160 100×50～200×100 | 2.0～5.5 | 10～50 | 110*2+110*2 | 500 |
| VZH-219 | 3.0～8.0 | 3.0～7.0 | 10～40 | 132*2+132*2 | 600 | ||
| VZH-219z | 4.0～10.0 | 4.0～9.0 | 10～40 | 132*2+160*2 | 800 | ||
| VZH-273 | Ø114.3～Ø273 | 4.0～10.0 | 90×90～200×200 120×60～260×130 | 4.0～9.0 | 10～40 | 160*2+160*2 | 800 |
| VZH-273z | Ø114.3～Ø273 | 4.5～12.0 | 4.5～11.0 | 10～35 | 180*4 | 800 |
