Globular-to-Spray Transition in Cold Wire Gas Metal Arc Welding

IF 2.2 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
R. A. Ribeiro, P. Assunção, E. B. F. Santos, E. Braga, A. Gerlich
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引用次数: 1

Abstract

The electrical current required for a transition from globular to spray droplet transfer during gas metal arc welding (GMAW) is determined by the specified wire feed speed in the case of constant-voltage power supplies. Generally, in narrow groove welding, spray transfer is avoided, be-cause this transfer mode can severely erode the groove sidewalls. This work compared the globular-to-spray transition mechanism in cold wire gas metal arc welding (CW-GMAW) vs. standard GMAW. Synchronized high-speed imaging with current and voltage samplings were used to characterize the arc dynamics for different cold wire mass feed rates. Subsequently, the droplet frequency and diameter were estimated, and the parameters for a globular-to-spray transition were assessed. The results suggest that the transition to spray occurs in CW-GMAW at a lower current than in the standard GMAW process. The reason for this difference appears to be linked to an enhanced magnetic pinch force, which is mainly responsible for metal transfer in higher welding current conditions.
冷丝气体保护金属弧焊中球形到喷雾的转变
在气体保护金属极电弧焊(GMAW)过程中,从球状熔滴过渡到喷雾熔滴所需的电流由恒压电源情况下的指定焊丝进给速度决定。一般情况下,在窄坡口焊接中,避免喷射转移,因为这种转移方式会严重侵蚀坡口侧壁。本文比较了冷焊丝气体保护焊(CW-GMAW)与标准GMAW中的球状到喷雾过渡机制。采用电流和电压采样的同步高速成像来表征不同冷丝质量进给速率下的电弧动力学。随后,估计了液滴的频率和直径,并评估了球形到喷雾过渡的参数。结果表明,CW-GMAW在比标准GMAW工艺更低的电流下发生向喷雾的转变。这种差异的原因似乎与增强的磁夹持力有关,该力主要是在较高焊接电流条件下金属转移的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Welding Journal
Welding Journal 工程技术-冶金工程
CiteScore
3.00
自引率
0.00%
发文量
23
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.
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