How to bevel and what are the selection principles for large-diameter spiral welded pipes?

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For the beveling of large-diameter spiral welded pipes, in principle, flame cutting and then grinding with an angle grinder are not allowed, which will cause adverse thermal effects on the pipeline. It is very common to repair with an angle grinder after a 45-degree cut.

Generally, we will choose U-shaped groove or composite groove, because the processing of U-shaped groove and composite groove is time-consuming and labor-intensive, which restricts the welding power of pipeline. V-shaped groove processing is simple, saving time and labor, but when large-diameter, thick-walled pipeline V-shaped groove is fully automatically welded, if the welding process parameters are not properly selected, welding defects will occur. With the improvement of the strength level of welded pipes for pipeline construction to X70 and X80 levels, and the increase of pipe diameter and wall thickness, automatic welding technology has been gradually used in pipeline construction since 2003. Due to the advantages of high welding power, low labor intensity, and little influence of human factors on the welding process, active pipeline welding technology has great potential in the construction of large-diameter and thick-walled spiral welded pipes.