Welding of Large-Diameter Steel Plate Spiral Pipes

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2021-01-13

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In the welding procedure specification for large-diameter steel plate spiral-welded pipes, specific welding process parameters are defined to ensure the repeatability of welder training. The objective of research and development in welding procedures is to guarantee that welded joints meet relevant standards and satisfy particular application requirements. Thick-walled pipes, as a widely used type of steel pipe, find extensive applications in industry; they are commonly employed as oil‑field drilling pipes and as high‑precision structural steel tubes for automotive and aerospace applications. Each of these end uses can be subject to various influencing factors, and thick-walled pipes may likewise be affected. Let us examine the factors that impact the welding of large-diameter steel plate spiral-welded pipes.

　　In large caliber Steel plate rolled pipe In welding procedure specifications, welding process parameters for specific applications are defined to ensure the repeatability of welder training. The goal of welding process research and development is to guarantee that welded joints meet relevant standards and satisfy particular service requirements. Thick-walled pipes, as a common type of steel pipe, are widely used in industry; they are frequently employed as oil‑field drilling pipes and as high‑precision structural steel tubes for automotive and aerospace applications. Each of these end uses can be subject to various influencing factors, and thick‑walled pipes may likewise be affected. Let us examine the factors that impact the welding of large‑diameter steel plate‑rolled pipes.

　　During the welding process, it is essential to consider not only the external stress effects on high‑strength, thick‑walled stainless steel pipes but also the influence of the environment on the welding method. Generally, ambient temperature, humidity, and wind speed can all affect the welding of thick‑walled pipes, and their impact varies depending on the specific conditions.

　　The primary causes of defects in large‑diameter steel plate spiral‑welded pipes include non‑uniform wire diameter, uneven wire joints, inconsistent wire hardness, uneven wire feed, and short circuits at the pipe ends caused by metal burrs. Under such circumstances, preventive and control measures can be implemented: inspect the welding wire diameter; for any contact tip that is not a standard‑shaped tip, appropriately increase the diameter of the contact tip. Welding wire manufacturers should polish the wire joints to ensure uniform joint diameters and consistent cutting hardness. Additionally, pay close attention to edge cutting and milling of the plates to eliminate burrs, and periodically release internal magnetic flux while performing magnetic shielding.

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