Simulation study on underwater wet welding DC arc discharge

LI Zhigang; HUANG Wei; LI Yang; XU Xiang; YE Jianxiong

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Simulation study on underwater wet welding DC arc discharge
Vol. 49, Issue 9, Pages: 119-123(2019)
Published：2019
DOI：
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DOI：

LI Zhigang, HUANG Wei, LI Yang, et al. Simulation study on underwater wet welding DC arc discharge[J]. Eletric Welding Machine2019, 49(9): 119-123. DOI：

摘要

水下湿法焊接电弧是在液体电介质中产生的电弧

与陆地气体环境电弧存在很大差异。从静电学和粒子物理学的角度建立了水下湿法焊接的电弧模型。该模型将水下介质分为电离气泡、过渡层和液体层。考虑采用Sommerfeld公式描述的饱和电流密度下的热发射

对水下焊接直流电弧放电进行了仿真分析。分析结果得出由电子束所形成电弧的形状及其电弧速度图

并且考虑了在水下湿法焊接过程所伴随的高能量和高电流密度作用下

电弧自身磁场对电子束轨迹的影响

电弧轨迹形状将收缩为"铃形"。

Abstract

Underwater wet welding arc is an arc produced in liquid dielectric and is very different from that in terrestrial gas environment arc. In this paper

an underwater wet welding arc model are created from the angles of electrostatics and particle physics

and it divides the underwater medium into ionized bubbles

transition layer

and liquid layer. Considering the heat emission at the saturation current density described by Sommerfeld’s formula

the underwater DC arc discharge is simulated. The analysis results show the shape of the arc formed by the electron beam and its arc velocity map

and the influence of the arc’s own magnetic field on the electron beam trajectory under the effect of high energy and high current density accompanying the underwater wet welding process.The shape of the arc track is shrunk to a "bell shape".