Knowledge

11Dec, 2024

Crack Defect
Cracking is a common welding defect in threaded steel pipes and has a significant impact on pipeline safety. It not only accelerates the corrosion rate of steel pipes but also pose
11Dec, 2024

Solutions for Incomplete Penetration and Lack of Fusion Defects
The incomplete penetration and lack of fusion defects are obviously closely related to the size of the groove. Therefore, in the design of the groove, it is essential to strictly a
11Dec, 2024

Incomplete Penetration and Lack of Fusion Defects
During the welding process, if there is no tendency for partial melting between the steel plate and the welding electrode, incomplete penetration or lack of fusion defects may occu
11Dec, 2024

Causes and Solutions for Undercut Defects
During the welding process, if there is a depression at the welding edge, causing the weld seam to be lower than the base material, this depression is known as an undercut defect.
10Dec, 2024

Causes and Solutions of Slag Inclusion Defects in Spiral Welded Pipes
During the welding process, welding electrodes and steel plates generate certain slag, which cannot be completely removed. Some of this slag remains in the weld and ultimately form
10Dec, 2024

Causes and Solutions of Porosity Defects in Spiral Welded Pipes
During the welding process of spiral steel pipes, gas spaces may exist on the surface of the weld or within the weld itself. This defect is known as porosity. The primary cause of
10Dec, 2024

Precautions for Chamfering
(1) Lamination and Inclusion When processing the pipe end, operators should carefully inspect the pipe end for lamination and inclusion. Steel pipes are not allowed to have laminat
10Dec, 2024

Function of Chamfering
The end face of spiral seam double-sided submerged arc welded pipes after plasma flying cut may exhibit defects such as uneven pipe ends, cutting inclination, slag, and length out
10Dec, 2024

Function of repair welding
Repair welding is required for steel pipes with defective weld seams and those containing joint seams.
09Dec, 2024

Function of Slag Removal
Slag removal involves clearing excess welding slag and flux from the interior of the pipe after internal welding. The method used is to lift the spiral pipe with a crane and tilt i
09Dec, 2024

Role of Initial Inspection of Pipe Cutting
Spiral seam double-sided submerged arc welded pipes typically have relatively large diameters and wall thicknesses, and most often, plasma cutting is employed for this purpose. To
09Dec, 2024

Parameters to be adjusted for internal and external welding
(1) Welding current (2) Welding voltage (3) Welding speed

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