Investigation of changes in geometrical parameters of GMAW surfaced specimens under the influence of longitudinal magnetic field on electric arc

Metal Working and Material Science Pub Date : 2024-03-15 DOI:10.17212/1994-6309-2024-26.1-6-21

V. Kuts, A. Oleshitsky, Alexander Grechukhin, I. Grigorov

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Abstract

Introduction. The paper presents the results of research of additive manufacturing process by electric arc with axial feeding of steel filler wire in protective gas environment (GMAW technology) with additional influence of external longitudinal magnetic field on electric arc. Purpose of work: an experimental study of the effect of a longitudinal magnetic field during additive manufacturing by an electric arc with axial feed of filler wire made of structural steels in a protective gas environment on the change in the geometrical characteristics of the layers being surfaced. Research Methods. The manufacturing of specimens was carried out on a 5-axis additive machine based on a CNC machine. Surfacing was carried out in the following modes: voltage 17.5 V; current 55–65 A; wire diameter 1.2 mm; wire material Sv-08G2S; wire feed rate 2,267 mm/min; approximate roll diameter 3.0 mm; roll length 50 mm; number of wires per one roll 312.5 mm; number of layers when surfacing the wall 5; magnet operation mode: alternating current with frequency 50 Hz, voltage 30 V; measured magnetic induction 5.7 mTl; initial height of the magnet above the substrate 10 mm; electrode stickout 10 mm; shielding gas: welding mixture CO2-Ar; gas pressure (flow rate) 0.15 MPa. Results and discussion. The conducted experimental study showed that the effect of longitudinal magnetic field had a statistically significant effect on the change in the dimensions of the singular, namely an increase in the width of the layers being surfaced by 34.1 %, with a calculated significance index close to zero, and a decrease in height by 20.2 %, with a calculated significance index equal to 2.7105. The effect of longitudinal magnetic field had a statistically significant effect on the change of the overall dimensions of the specimens consisting of five layers, namely, the width of the specimens increased by 11.2 % with a calculated significance index of 4.3103, and the height of the specimens decreased by 10.3 % with a calculated significance index of 6.3105. The effect of longitudinal magnetic field had no statistically significant effect on the change of the vertical deviation from straightness for the side walls of the specimens, with a calculated significance index of 0.3277, and had no statistically significant effect on the change of the error of the width of the walls of the specimens, with a significance index of 0.098.

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电弧纵向磁场影响下 GMAW 表面试样几何参数变化的研究

引言本文介绍了在保护气体环境（GMAW 技术）下通过电弧轴向送入钢填料丝进行快速成型工艺的研究成果，以及外部纵向磁场对电弧的额外影响。工作目的：在保护性气体环境下，通过电弧轴向送入结构钢填充丝进行快速成型过程中，纵向磁场对堆焊层几何特征变化的影响的实验研究。研究方法。试样的制造是在一台基于数控机床的五轴快速成型机上进行的。堆焊在以下模式下进行：电压 17.5 V；电流 55-65 A；金属丝直径 1.2 mm；金属丝材料 Sv-08G2S；金属丝进给速度 2,267 mm/min；轧辊近似直径 3.0 mm；轧辊长度 50 mm；每辊金属丝数量 312.5 mm；堆焊墙面时的层数为 5；磁铁运行模式：频率为 50 Hz 的交流电，电压为 30 V；测得磁感应强度为 5.7 mTl；磁铁在基体上方的初始高度为 10 mm；电极偏移 10 mm；保护气体：CO2-Ar 焊接混合物；气体压力（流速）为 0.15 MPa。结果与讨论实验研究表明，纵向磁场对奇异体尺寸变化的影响具有统计学意义，即堆焊层的宽度增加了 34.1%，计算出的显著性指数接近于零；高度降低了 20.2%，计算出的显著性指数等于 2.7105。纵向磁场效应对由五层组成的试样的整体尺寸变化有显著的统计学影响，即试样的宽度增加了 11.2%，计算的显著性指数为 4.3103，试样的高度降低了 10.3%，计算的显著性指数为 6.3105。纵向磁场对试样侧壁垂直偏离直线度的变化没有显著的统计学影响，计算的显著性指数为 0.3277；对试样壁宽误差的变化也没有显著的统计学影响，显著性指数为 0.098。

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Metal Working and Material Science

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