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Forming & Welding & Sizing Section

As the most important part of the tube mill line, Forming & welding & sizing machine makes steel strip into steel pipe. The size and shape  can be customized according to the customer’s needs

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Product Introduction
Video
Product Features
Technical Parameters

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.

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

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