摘要：Welding quality significantly impacts the safety of large-diameter, long-distance pipelines. The molten pool flow, influenced by gravity, results in variations in the girth weld seam at different circumferential orientations. A three-dimensional transient computational fluid dynamics model was developed to study the multi-layer, multi-pass welding process of X80M pipeline, incorporating arc heat, droplet heat, gravity, and fluid flow in the molten pool. The model also simulates dual-torch automatic welding to examine heat transfer and flow characteristics. Notably, it reveals the morphological evolution of the girth weld seam from the 2 to 3 o'clock positions during continuous welding, an area lacking prior research. The results, validated by experiments, show good agreement between the simulation and thermal cycle curves. The weld pool solidifies from the sides toward the center, creating a concave shape due to downward metal flow, with dual-torch welding intensifying this effect. The second torch increases the concavity of filler layers, with depths rising by 21.81% and 32.20%. These findings offer new insights into pipeline girth welding.

ISSN号：1070-6631

卷、期、页：卷36期12

发表日期：2024-12-01

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：PHYSICS OF FLUIDS

通讯作者：云泽,吴娟慧

第一作者：李岩,刘啸奔,王昊,张宏

论文类型：期刊论文

论文概要：云泽,李岩,吴娟慧,刘啸奔,王昊,张宏，A computational fluid dynamics-based girth welding model for large-diameter pipeline to reveal vertical weld formation mechanism，PHYSICS OF FLUIDS，2024，卷36期12

论文题目：A computational fluid dynamics-based girth welding model for large-diameter pipeline to reveal vertical weld formation mechanism