等离子弧焊中金属蒸气的影响机理

IF 2.2 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Welding Journal Pub Date : 2022-06-01 DOI:10.29391/2022.101.012

Zihan Li, Jianwen Xin, Xueming Hua, Dongsheng Wu, S. Tashiro, Manabu Tanaka, Huan Wang

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引用次数: 0

摘要

建立了三维耦合的钨电极-等离子弧-金属气相-焊池模型，研究了导电等离子弧搭接焊接过程中等离子弧和金属气相的特性、焊池对流和能量传递。计算了电弧能量效率。结果表明:在传导型等离子弧搭接焊中，小收缩喷嘴、等离子体气体和电磁力对等离子弧的约束作用较强，焊池内不形成锁孔，焊池表面热流密度高，焊池温度高，焊池表面铁蒸气摩尔分数高;电弧中高浓度的铁蒸气降低了等离子体电弧到熔池的传导能，降低了电弧的能量效率。计算出的电弧能量效率仅为50.2%。在不考虑Fe汽相的情况下，计算得到的焊缝熔池接头熔透完全。考虑铁蒸气时，计算的焊缝几何形状与实验结果吻合较好。

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Influence Mechanism of Metal Vapor in Plasma Arc Lap Welding

A three-dimensional coupled tungsten electrode–plasma arc–metal vapor– weld pool model was developed to investigate plasma arc and metal vapor characteristics, weld pool convection, and energy transfer in conduction plasma arc lap welding. The arc energy efficiency was also calculated. The numerical results showed that in conduction plasma arc lap welding, the constraint effects of the plasma arc by a small constricting nozzle, plasma gas, and electromagnetic force were strong, and no keyhole was formed inside the weld pool, so the heat flux on the weld pool surface was high as well as the weld pool temperature and mole fraction of Fe vapor above the weld pool surface. The high concentration of Fe vapor in the arc decreased the conduction energy from the plasma arc to the weld pool along with the arc energy efficiency. The calculated arc energy efficiency was only 50.2%. Without considering Fe vapor, the calculated weld pool had complete joint penetration. When considering Fe vapor, the calculated weld geometry agreed well with the experimental result.

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来源期刊

Welding Journal 工程技术-冶金工程

CiteScore

3.00

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： The Welding Journal has been published continually since 1922 — an unmatched link to all issues and advancements concerning metal fabrication and construction. Each month the Welding Journal delivers news of the welding and metal fabricating industry. Stay informed on the latest products, trends, technology and events via in-depth articles, full-color photos and illustrations, and timely, cost-saving advice. Also featured are articles and supplements on related activities, such as testing and inspection, maintenance and repair, design, training, personal safety, and brazing and soldering.