LSAW steel tube

LSAW (Longitudinal double submerge arc welding) is a type of SAW pipe made of steel plates that were hot rolled by JCOE or UOE forming technology. JCOE technology represents the shaping and forming processes involved during manufacturing as well as the inner and outer welding and cold expansion carried out after welding.

Process of straight seam submerged arc welded tube

Longitudinal submerged arc welded tube is a common welding process used to weld steel pipes. The following is the process flow of straight seam submerged arc welded tube:

1. Preparation: Collect required materials and equipment, including steel pipes, welding rods, welding machines, brushes, sandpaper, etc.

2. Surface treatment: Use brushes and sandpaper to remove rust and dirt on the surface of the steel pipe to ensure the quality of welding.

3. Edge grinding: chamfer or bevel both ends of the steel pipe to be welded to form a V-shaped gap and improve the welding quality of the joint.

4. Positioning and fixing: Use clamps or other fixing devices to stabilize the two steel pipes to be connected in the welding position to ensure the alignment of the two steel pipes.

5. Welding rod selection: The selection of suitable welding rods is determined based on factors such as the material, thickness and use environment of the steel pipe.

6. Welding rod drying: Put the welding rod into the welding rod drying furnace for drying treatment to remove the moisture in the welding rod and improve the quality of welding.

7. Welding operation: Insert the welding rod into the welding rod holder, start the welding machine, and heat the edge of the steel pipe and the welding rod through the welding current and arc to melt them and form a weld.

8. Welding completed: Check the welding length and quality according to the requirements and specifications to ensure the tightness and appearance quality of the weld.

9. Welding seam treatment: Use a brush to clean the oxide scale and welding slag on the surface of the welding seam, and grind and polish it to make the welding seam smoother and more beautiful.

10. Inspection and acceptance: Conduct visual inspection and dimensional measurement of the welded pipes to determine whether they meet the requirements and standards. If it is qualified, it will be accepted, otherwise it will need to be repaired or re-welded.

The above is the basic process flow of straight seam submerged arc welded tube. The specific operation steps may vary depending on the materials and requirements.

Precautions for straight seam submerged arc welded tubes

1. When making longitudinal submerged arc welded pipes, safety issues need to be paid attention to. Use protective equipment to avoid harm to the human body from light and smoke generated by welding.

2. When welding, pay attention to controlling the welding parameters. Too high or too low current and voltage will affect the welding quality. According to the welding materials and requirements, select appropriate parameters for welding.

3. After welding is completed, the welds must be inspected and trimmed. Discover and correct welding defects in time to improve welding quality.

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