Automatic circumferential seam welding machine is an automatic welding equipment used for the automatic welding of circular or annular joints.
Its core working principle: the workpiece rotates by itself while the welding torch remains in a fixed position, so as to realize continuous and stable welding of circular weld seams.

I. Basic Composition

1.Machine body and transmission mechanism 

Serving as the framework of the whole machine, it drives the workpiece fixture to rotate via a motor to realize circumferential welding.
2.Workpiece clamping system
It consists of a rotating end (chuck) and an adjustable tailstock. The tailstock is tightly propped by devices such as air cylinders to ensure the stability of the workpiece during rotation and guarantee welding accuracy.
3.Welding execution system
Namely the welding torch (supporting multiple processes including TIG, MIG/MAG, PAW, etc.), which is usually fixed on a multi-dimensional adjustable bracket.
4.Control system
Centered on a PLC programmable logic controller, it realizes one-click start, automatic welding and other operations, and stores welding parameters.
Example: XNL-H circumferential seam series of SupeLine Intelligent Welding Equipment

II. Supported Welding Processes

The automatic circumferential seam welding machine can be flexibly equipped with a variety of mainstream welding processes to adapt to different application scenarios, and can also realize composite processes such as plasma arc welding (PAW) combined with tungsten inert gas welding (TIG).

III. Basic Working Process

1.Workpiece Loading
Place the workpiece to be welded into the fixture, and the pneumatic tailstock automatically tightens it.
2.Parameter Setting
Input workpiece information on the control screen, and set or recall welding parameters.
3.Welding Start
After pressing the start button, the workpiece rotates at a constant speed and the welding torch ignites to start welding.
4.Automatic Completion
Once the programmed rotation cycles are completed, the welding torch automatically extinguishes and lifts up, the tailstock releases the workpiece, and the welding process is finished.

IV. Application Scenarios

Its core advantage lies in automation, and it is widely used in fields requiring high efficiency, high precision and stable welding quality:
• Pipeline Engineering: Butt welding of pipe-to-pipe and pipe-to-flange, as well as connection of pipe fittings such as elbows and tees; it is indispensable in petroleum and natural gas industries.
• Pressure Vessels: Welding of cylindrical shells for various boilers, chemical storage tanks and gas cylinders.
• Aerospace & Military Industry: Applied to high-standard components such as engine metal pipelines and precision structural parts.
• Other Industries: Widely used for welding annular parts in refrigeration (air conditioning compressors), liquid cooling, instrumentation, hardware, food and other industries.

Main Advantages & Classification

Compared with traditional manual welding, automatic welding equipment has prominent advantages. It is mainly divided into single-torch type and double-torch type.
The double-torch type supports simultaneous internal and external welding, boosting efficiency by over 50%; the single-torch type features a simpler structure and lower cost.
In terms of structural form, it is mainly classified into vertical type and horizontal type.
The vertical type is suitable for short and small workpieces with a compact structure; the horizontal type is applicable to long pipes and cylinders (tolerance error ≤ 0.5mm) with convenient operation.