A kind of circular seam butt welding method of seamless steel pipe

Abstract

The invention discloses a method for circular seam butt welding of seamless steel pipes, which comprises: processing a U-shaped groove on the welded joint of a seamless steel pipe to be welded; using an automatic tungsten inert gas shielded welding torch to perform self-fluxing welding on the inner wall of the groove, according to The welder remotely observes or adopts seam tracking and arc voltage tracking to adjust the position and posture of the welding torch in real time; the gas shielded welding torch is used to perform filling and capping welding in the groove of the outer wall of the pipeline. The "inner wall self-fluxing root welding" and the "outer wall groove filling welding" steps can be performed at the same time, or the "outer wall groove filling welding" step can be performed after all self-fluxing welding of the inner wall of the groove is completed.

Description

technical field

[0001] The invention relates to a method for circular seam butt welding of seamless steel pipes, in particular to a method for circular seam butt welding in the construction of steel catenary riser pipe laying for the development of deep sea oil and gas resources. Background technique

[0002] Steel catenary riser laying technology has won the favor of deepwater development due to its relatively simple manufacturing process and low cost. However, the complex marine environment and increasing production requirements pose more challenges for the design and manufacture of deepwater steel catenary risers. As the water depth increases and the length of the riser increases, the marine environment becomes more severe. The generation of underwater vortex-induced vibrations will cause severe vibrations perpendicular to the water flow and the axis of the cylinder. At the same time, the steel catenary riser passes through the joint and the platform. The effect of alter...

Images