Purpose

The purpose of this paper is to find a theoretical reference to adjust the unsymmetrical arc shape and plasma flow of overlapping deposition in wire arc additive manufacturing (WAAM) and ensure the effect of the gas shielding and stable heat and mass transfer in deposition process. The multiphysical numerical simulation and physical experiment are used for validation.

Design/methodology/approach

In this study, welding torch tilt deposition and external parallel magnetic field–assisted deposition are presented to adjust the unsymmetrical arc shape and plasma flow of overlapping deposition, and a three-dimensional numerical model is developed to simulate the arc of torch tilt overlapping deposition and external parallel magnetic field–assisted overlapping deposition.

Findings

The comparison of simulated results indicate that the angle of welding torch tilt equal to 20° and the magnetic flux density of external transverse magnetic field equal to 0.001 Tesla are capable of balancing the electric arc and shielding gas effectively, respectively. The arc profiles captured by a high-speed camera match well with simulated results.

Originality/value

These studies of this paper can provide a theoretical basis and reference for the calibration and optimization of WAAM process parameters.

中文翻译：

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电弧电弧增材制造重叠沉积过程中焊炬倾斜度和外部磁场对电弧的影响研究

目的

本文的目的是找到理论参考，以调整电弧增材制造（WAAM）中不对称的电弧形状和重叠沉积的等离子流，并确保气体屏蔽效果以及沉积过程中稳定的传热传质。使用多物理场数值模拟和物理实验进行验证。

设计/方法/方法

在这项研究中，提出了焊炬倾斜沉积和外部平行磁场辅助沉积来调节重叠沉积的不对称电弧形状和等离子流，并建立了三维数值模型来模拟焊炬倾斜重叠沉积和分离的电弧外部平行磁场辅助的重叠沉积。

发现

模拟结果的比较表明，焊枪倾斜角度等于20°，外部横向磁场的磁通密度等于0.001 Tesla，能够分别有效地平衡电弧和保护气体。高速摄像机捕获的电弧轮廓与模拟结果非常吻合。

创意/价值

本文的研究可以为WAAM工艺参数的标定和优化提供理论依据和参考。