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. 2022 Aug 29;15(17):5967.
doi: 10.3390/ma15175967.

Research on Filling Strategy of Pipeline Multi-Layer Welding for Compound Narrow Gap Groove

Tie Yin  1   2 , Jinpeng Wang  3 , Hong Zhao  1 , Lun Zhou  1   2 , Zenghuan Xue  2 , Hehe Wang  2
Affiliations

Research on Filling Strategy of Pipeline Multi-Layer Welding for Compound Narrow Gap Groove

Tie Yin et al. Materials (Basel). .

Abstract

With the increase in transmission pressure and pipe diameter of long-distance oil and gas pipelines, automatic welding of the pipeline has become the mainstream welding method. The multi-layer and multi-pass welding path planning of large-diameter pipelines with typical narrow gap grooves are studied, and a welding strategy for pipeline external welding robot is proposed. By analyzing the shape of the weld bead section of the narrow gap groove and comparing the advantages and disadvantages of the equal-height method and the equal-area method, the mathematical model of the filling layer is established. Through the test and analysis in the workshop, the predicted lifting value meets the actual welding requirements. The microstructure of the weld was analyzed by SEM. The main structure of the weld was fine acicular ferrite, which could improve the mechanical properties of the welded joint. After multi-layer filling, the filling layer is flush with the edge of the groove. The establishment of this model lays a foundation for the formulation of welding process parameters for large-diameter pipes and the off-line programming of welding procedures.

Keywords: filler layer strategy; narrow gap groove; pipeline welding; prediction model.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Pipeline all-position welding system.
Figure 2
Figure 2
Narrow gap groove weld.
Figure 3
Figure 3
Schematic diagram of narrow gap compound groove.
Figure 4
Figure 4
Weld pass filling layer appearance: (a) concave; (b) convex; (c) hump.
Figure 5
Figure 5
Filling diagram of pipeline external welding robot.
Figure 6
Figure 6
Experiment installation.
Figure 7
Figure 7
Macro metallographic diagram.
Figure 8
Figure 8
Microstructure of weld metal under SEM.
See this image and copyright information in PMC

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