本文選題：鎢極惰性氣體保護(hù)焊 + 金屬蒸汽��； 參考：《物理學(xué)報(bào)》2015年10期

【摘要】：基于局域熱平衡狀態(tài)假設(shè)并考慮金屬蒸汽的作用,建立了鎢極惰性氣體保護(hù)焊電弧與熔池交互作用的三維數(shù)學(xué)模型.電弧等離子體的熱力學(xué)參數(shù)和輸運(yùn)系數(shù)由溫度和金屬蒸汽濃度共同決定,并使用第二黏度近似簡(jiǎn)化處理金屬蒸汽在氬等離子中的輸運(yùn)過(guò)程.在考慮熔池流動(dòng)時(shí),主要考慮了浮力、電磁力、表面張力和等離子流拉力的作用.通過(guò)對(duì)麥克斯韋方程組、連續(xù)性方程、動(dòng)量守恒方程、能量守恒方程和組分輸運(yùn)方程的耦合求解,得到了金屬蒸汽在電弧中的空間分布、電弧和熔池的溫度場(chǎng)、速度場(chǎng)和電流密度分布等重要結(jié)果.通過(guò)與未考慮金屬蒸汽的結(jié)果對(duì)比,研究了熔池上表面產(chǎn)生的金屬蒸汽對(duì)電弧等離子體行為的影響,以及電弧等離子對(duì)熔池行為的影響.結(jié)果表明,金屬蒸汽主要富集在熔池上表面附近;金屬蒸汽對(duì)電弧等離子體有明顯的收縮作用,而對(duì)等離子速度和電勢(shì)影響較小;金屬蒸汽的出現(xiàn)對(duì)熔池上表面速度分布和剪切力分布以及熔池形貌并無(wú)明顯影響.求解結(jié)果與已有的實(shí)驗(yàn)結(jié)果和計(jì)算結(jié)果符合良好.
[Abstract]:Based on the assumption of local thermal equilibrium and taking into account the effect of metal vapor, a three-dimensional mathematical model of the interaction between arc and pool of tungsten inert gas welding is established. The thermodynamic parameters and transport coefficients of arc plasma are determined by temperature and metal vapor concentration, and the second viscosity is used to simplify the transport process of metal vapor in argon plasma. The effects of buoyancy, electromagnetic force, surface tension and plasma current tension are considered in the consideration of molten pool flow. By coupling the Maxwell equations, the continuity equations, the momentum conservation equations, the energy conservation equations and the component transport equations, the spatial distribution of metal vapor in the arc, the temperature field of the arc and the melting pool are obtained. Some important results, such as velocity field and current density distribution, are obtained. The effect of metal vapor on the behavior of arc plasma and the effect of arc plasma on the behavior of molten pool were studied by comparing with the results without taking into account the metal vapor. The results show that the metal vapor is mainly concentrated near the upper surface of the molten pool, and the metal vapor has obvious shrinkage effect on the arc plasma, but has little effect on the plasma velocity and potential. The appearance of metal vapor has no obvious influence on the surface velocity distribution, shear force distribution and weld pool morphology. The results agree well with the experimental results and the calculated results.
【作者單位】： 蘭州理工大學(xué)材料科學(xué)與工程學(xué)院;省部共建有色金屬先進(jìn)加工與再利用國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):51074084,51205179) 甘肅省自然科學(xué)基金(批準(zhǔn)號(hào):1010RJZA037)資助的課題~~
【分類(lèi)號(hào)】：TG444.74

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 董文超;陸善平;李殿中;李依依;;微量活性組元氧對(duì)焊接熔池Marangoni對(duì)流和熔池形貌影響的數(shù)值模擬[J];金屬學(xué)報(bào);2008年02期

2 王小杰;武傳松;陳茂愛(ài);;等離子弧定點(diǎn)焊熔池穿孔過(guò)程的數(shù)值分析[J];金屬學(xué)報(bào);2010年08期

3 蘆鳳桂,姚舜,錢(qián)偉方;基于TIG焊電弧-熔池統(tǒng)一模型分析焊接電弧[J];機(jī)械工程學(xué)報(bào);2004年05期

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

1 Hidetoshi Fujii;Kiyoshi Nogi;;Weld Shape Variation and Electrode Oxidation Behavior under Ar-(Ar-CO_2) Double Shielded GTA Welding[J];Journal of Materials Science & Technology;2010年02期

2 姜澤東;;鉭薄板小間隙TIG氦弧對(duì)接焊熔池形成機(jī)理的研究[J];電焊機(jī);2009年07期

3 石s，

本文編號(hào)：1982845