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Numerical simulation and stability analysis of molten pool dynamics in K-TIG pipe welding
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DOI：10.1088/1361-651X/ae287f.png)
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Abstract
En 中文
A three-dimensional transient numerical model was developed to investigate the influence of torch position on process stability in K-TIG pipeline welding. A multi-physics field thermo-mechanical coupled model was established, providing a framework for analyzing the dynamic temperature and flow fields under various torch positions. The results reveal that the support from the base metal to the molten pool and the travel direction of the torch are critical factors in maintaining the force balance essential for keyhole stability. It was further demonstrated that within the 0 degrees to 60 degrees positional range, process stability can be enhanced by synergistically increasing welding current, reducing travel speed, and applying water-cooling to both the upper and lower surfaces of the workpiece, thereby achieving high-quality welds. Beyond this range, loss of base metal support disrupts the force equilibrium in the rear molten pool, ultimately resulting in keyhole collapse and process instability. This study elucidates the physical mechanism by which torch position governs welding stability, providing a theoretical basis for the development of all-position K-TIG welding procedures for pipelines.
Keywords:
numerical simulation
K-TIG
molten pool
keyhole
welding stability zone
Journal
IF:
2.4
Papers:
121
Citations:
7.7K