Knowledge

04Sep, 2025

27.12. What is the function of a repair weld?
For steel pipes with defective welds and steel pipes with joint joints, repair welding of steel pipes is required.
04Sep, 2025

27.11. What is the function of slag cleaning?
Slag cleaning is to clean up the excess welding slag and flux after internal welding from the pipe, and the method used is to lift the spiral pipe with an overhead crane and tilt i
02Sep, 2025

27.10. What is the role of the primary tube incision inspection?
The diameter and wall thickness of spiral seam double-sided submerged arc welded pipe are relatively large, and most of them are currently cut by plasma. In order to ensure the ver
01Sep, 2025

27.9. What parameters need to be adjusted for internal and external welding?
(1) Welding current (2) Welding voltage (3) Welding speed
01Sep, 2025

27.8. What is the function of external welding?
External welding refers to welding on the outer surface of the steel pipe at one or two half-pitch after internal welding.
01Sep, 2025

27.7. What is the function of internal welding?
At a certain distance from the meshing point of the steel strip forming, the welding arm is extended into the steel pipe for welding. Both internal and external welding adopt the a
27Aug, 2025

27.6.1. What is a Molding Angle?
The forming angle refers to the sharp angle at which the centerline of the steel pipe intersects the horizontal projection of the centerline of the steel strip, usually expressed i
27Aug, 2025

27.6. What is the role of molding?
Under the action of the former, the steel strip of the required width, thickness and corresponding material is rolled into the steel pipe of the required specification according to
25Aug, 2025

27.5. What is the role of delivery?
The strip passes through the middle of the lower roller and the upper roller of the conveyor, and the pressing cylinder acts on both ends of the upper roller, and under the force o
25Aug, 2025

27.4. What is the function of edge cutting?
The steel strip is continuously sheared through the disc shear to become a steel belt of consistent width, and the steel strip used for spiral welded pipes is round edge, and the t
21Aug, 2025

27.3. What is the function of shear butt welding?
In the production process of spiral welded pipes, in order to ensure the continuous production of the production line, two coils of steel strips need to be welded together to form
20Aug, 2025

27.2. What is the function of leveling?
Due to the parallel staggered and overlapping straightening rollers, the steel strip passing through it can be repeatedly elastoplastic deformed, and under the condition of large e

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