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This machine is mainly used for circumferential seam welding of tank head and tank circumferential seam welding.

1.Welding torch is fixed while work piece rotating, welding position is horizontal. One end of work piece is jigged by power head and rotates

2.Two welding torches and two power sources work simultaneously to improve work efficiency.

3.Torch, spindle box and tailstock can be adjusted longitudinally to fit various kinds of welding.

4.Japan Omron PLC is adopted to control the machine to run and speed is adjusted by AC inverter, which can improve the reliability of the equipment.

5.Adopts end face positioning and pneumatically clamping mode.

6.Adopts human-machine interface to alter the parameters. The welding time and weld length can be set via this interface. The alteration of the parameters can be input through the touch button conveniently and timely. Parameters can be stored and called.

【Main parameters】

No.Item Specification
1Applicable diameter100-400mm, 500-800mm
2Applicable length500mm- 1000mm, 1000-2000mm
3MaterialCarbon steel, stainless steel, aluminum
5 Welding mode available


6Rotation speed0.2-2rpm
7Motor power0.55KW

Welding torch pneumatic lifting



Welding torch fine tune


10Welding torch dip angle


11Machine working voltage

380v 3phase 50Hz

220v 1phase 50Hz

【Equipment composition】

This machine is made up of mainframe, spindle box and its pneumatic feeding mechanism, tailstock and its pneumatic feeding mechanism, workpiece supporting mechanism, welding torch feeding and adjusting mechanism, electrical control system, pneumatic system and welding power source.

1.Main Frame

The mainframe consists base, column and etc. The base is assembled and welded from the square tubes and plates with the upper surface machined, on which fixed the linear guide rails. The right side of the guide rails installed the spindle box and its pneumatic feeding mechanism and its left side equipped with tailstock and its pneumatic device. The tailstock can be adjusted along the guide rails and the spacing can be adjusted to meet the requirements of various kinds of welding. The tailstock is micro adjusted by hand-operated screw rod and the adjustment is marked by scaleplate. The tailstock is guided by the guide rails to ensure the concentricity to the spindle box. Beside the spindle box and the tailstock installed the welding torch clamping, adjusting and pneumatic lifting mechanism. The mechanism can be adjusted and the spacing can vary. It also can be fastened after being adjusted. On the right outside of the machine fixed the electrical system control box and the front right side equipped with the control button panel, which is convenient to use and maintain.

2.The Rotary Axis Box

The rotating machine head is made up of AC motor, speed reducer, pneumatic chuck and conductive device. The adjusting of the rotating speed is achieved by using AC frequency converter to adjust the AC motor rotating speed. The speed reducer adopts two-stage worm gear to reduce the speed. The material of the reducer case is aluminum alloy with large output torque, which is convenient to install and maintain. The conductive sleeve is made of copper. With filling conductive lubricant between the copper sleeve and the spindle it can gain a good wear resistance and electric conduction. The pneumatic fixture automatically goes back to the start point at the end of every welding. The fixture clamps two ends of the workpiece tightly to ensure the uniformity of every clamping.

3.Tailstock Clamping Mechanism

The pneumatic tailstock can be adjusted along the guide rails to meet the requirements of various kinds of welding. It adopts hand-operating screw rod to adjust. The workpiece is clamped pneumatically and rotates. The extension of the tailstock equipped with pneumatic fixture.  The fixture clamps two ends of the workpiece tightly to ensure the uniformity of every clamping. Machine base is made of cast iron and thick steel tube. Guide rails are installed on the base.

4.Workpiece Supporting Mechanism

The left and right sides of the machine installed V-shaped brackets to support the workpiece. The V-shaped brackets move up and down pneumatically, move up when clamping and move down when welding.

5. Welding Torch Feeding and Adjusting Mechanism, and welding oscillating lifting device   

There are two sets of welding torch feeding and adjusting devices separately installed on the left and right side of the machine, moving up and down pneumatically to switch between the preparing position and welding position. The welding torch, wire feeder and wire reel are fixed and rise and fall accompany with the air cylinder. The pneumatic lifting is guided by the linear bearing and guide pillar with high positioning accuracy. The welding torch adopts push type wire feeding mode, which has short feeding distance and stable feeding. The two torches can be fully adjusted along the beam guide rails and can be adjusted up and down, left and right, forward and backward or by angle. The micro adjusting of the torch adopts dovetail type and adjusted through screw rod with accurate adjusting and high-precision positioning. The screw rod can be fastened after the adjusting. The numerical control system controls the swing frequency, swing amplitude, swing time, automatic lifting time, lifting distance, lifting times, etc.

6. Electrical Control System

Japan made Omron PLC is used as the core to control the clamping and welding programs. The system has a good stability and simple structure, which is easy to maintain.

Adopts Taiwan made WEINVIEW 7″ touch screen as the input/output interface. The weld length and other parameters can be input via this interface. It can alarm when a failure happens during the welding process and give indication.

Integrated control panel. Control buttons, touch screen and welding parameters are all integrated on one panel, which is convenient to use and operate.

Workpiece rotary device adopts AC motor. To change the rotating speed of the motor via adjusting the frequency. The rotating speed can be stepless adjusted and can be digital displayed in cm/min with low fault ratio, which is suitable for long-term use.

The weld length is detected by the rotary encoder close-loop system, the position detection as: welding torch position, machine head position and the tailstock position  detected by imported contact-less switch.

The welding start point is detected automatically, and the torch automatically return back at the end of welding.