Automatic Internal Straight Seam Welding Machine for Pipes & Cylinders

 

I.What is the internal straight seam welding machine?

The internal straight seam welder is an automated welding equipment specially used for welding straight seams inside workpieces. It is widely used in the internal longitudinal straight seam welding of cylindrical or tubular workpieces such as pipes, cylinders, and containers. It plays an important role in the manufacturing fields of pressure vessels, petrochemical equipment, boilers, automobile fuel tanks, hydraulic cylinders, etc.

 

II.How is it working ?

The core of the internal straight seam welding machine is to use a mechanical structure to send the welding gun into the interior of the workpiece, align it with the longitudinal straight seam to be welded (such as the inner seam after the cylinder is butted), and then realize the welding process through automatic control:

1. The workpiece is clamped and secured, ensuring the seam to be welded is horizontal or in a preset position.
2. The welding torch, through an inward extension mechanism, is inserted into the workpiece and aligned with the weld seam starting point.
3. The welding process is initiated, the welding power source generates an arc, and the welding wire is continuously fed and melted, while shielding gas is simultaneously emitted to isolate the air.
4. The welding torch travels uniformly along the seam at a preset speed, with the molten metal filling the joint and forming the weld.
5. When welding is complete, the welding torch automatically returns to its original position, and the workpiece is released and unloaded.

 

III.The inner longitudinal seam welding machine features

• High-Precision Welding

The welding torch utilizes a servo drive and precision guide rails for high repeatability. When combined with the seam tracking system, accurate weld placement and aesthetically pleasing results are ensured, even with slight workpiece deformation or assembly errors.

• High Degree of Automation

From parameter setup and torch positioning to welding completion, the entire process is automated, minimizing the impact of manual operation on welding quality (such as uneven welds and leaky welds, which are common with manual welding). This makes it particularly suitable for mass production.

• Adaptable to Complex Working Conditions

The welding torch's compact design accommodates small-diameter barrels (some equipment has a minimum inner diameter of 100mm or greater) and can withstand the high temperatures of the welding area. Some equipment features anti-splash and dust-proof construction to extend the life of consumable parts.

• Stable Welding Quality

Precisely controlling welding parameters (current, voltage, speed, etc.) ensures uniform penetration, the absence of defects such as porosity and slag inclusions, and weld strength that meets industry standards .

 

IV.Welding effect display

 

 

 

V.Vedio for your reference

Pleace check the vedio to help you understand the welding process:

 

VI.Applications of Automatic Internal Straight Seam Welding Machine

 

• Pipes & Tubes – Automatic longitudinal seam welding of pipe and tubular workpieces.
• Hydraulic Cylinders – Straight seam welding of hydraulic cylinder shells and cylindrical components.
• Cylindrical Tanks – Welding of longitudinal seams on cylindrical tanks and metal shells.
• Pressure Vessels – Longitudinal seam welding of cylindrical pressure vessel shells and components.
• Industrial Tubular Parts – Straight seam welding for various cylindrical and tubular metal components.

 

Common welding materials include:Stainless steel, Carbon steel, Iron, Aluminum, and Galvanized steel.

 

 

VII.FAQ

 

1. What is an internal straight seam welding machine?

An internal straight seam welding machine is an automatic welding system designed to weld longitudinal seams inside cylindrical, tubular and other suitable metal workpieces. It helps achieve consistent welding speed, stable seam quality and improved production efficiency.

2. What workpieces can this machine weld?

The machine is suitable for internal straight seam welding of pipes, tubes, hydraulic cylinder shells, cylindrical tanks and other tubular or cylindrical workpieces. The machine configuration can be customized according to the workpiece dimensions and welding requirements.

3. Can it weld hydraulic cylinder shells?

Yes. The machine can be used for longitudinal seam welding of hydraulic cylinder shells and similar cylindrical components. The welding system can be configured according to the cylinder diameter, length, wall thickness and material.

5. Can the welding machine be customized?

Yes. We can customize the machine according to workpiece diameter, length, wall thickness, material, welding position and production requirements. Different welding processes and automation configurations can also be provided.

6. Can it be used for different pipe diameters?

Yes. The machine can be designed to accommodate a specified range of pipe or cylinder diameters. The suitable working range should be determined according to the customer's actual workpiece dimensions.

7. How can I choose the right internal straight seam welding machine?

The machine should be selected according to the workpiece diameter, length, wall thickness, material, seam length, welding process and required production capacity. Providing these parameters allows us to recommend a suitable configuration.

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