The aim of this study was to assess the possibility of improving control of small-scale resistance spot welding (SSRSW) of the Ni-15 %Fe-4 %Mo-1 %Mn permalloy in the production of low-noise ring cores for fluxgate magnetometers. It was found that the range of the optimal current–time parameters (weld lobe) was within current amplitudes of 1–2 kA and pulse durations of 6–14 ms, which allowed to form sound nuggets with sufficient diameters but without expulsions in most cases. A preheating stage (a pulse with an amplitude of about 1 kA and a duration of 3–4 ms) had a positive effect on the stability of both dimensions and mechanical characteristics of the investigated nuggets. A decrease in the solidification rate slightly improved the stability of tensile shear strength values of the SSRSW joints despite the absence of fundamental differences in the microstructure and phase composition of the weld metals. To determine the reliability of predicting the quality of the SSRSW joints by assessing dynamic resistances measured during the formation of nuggets, a comparative statistical analysis of their diameters and the tensile shear strength values was carried out. The obtained results did not reveal any strong correlation between these parameters.

中文翻译：

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Ni-15%Fe-4%Mo-1%Mn坡莫合金小尺寸电阻点焊在磁通门磁力计低噪声环形磁芯生产中的进展

本研究的目的是评估在磁通门低噪声环形磁芯生产中改进 Ni-15 %Fe-4 %Mo-1 %Mn 坡莫合金小规模电阻点焊 (SSRSW) 控制的可能性磁力计。结果发现，最佳电流-时间参数（焊缝波瓣）的范围在电流幅度 1-2 kA 和脉冲持续时间 6-14 ms 内，这允许形成具有足够直径的健全熔核，但在大多数情况下不会发生喷射。 。预热阶段（幅度约为 1 kA、持续时间为 3-4 ms 的脉冲）对所研究的熔核的尺寸和机械特性的稳定性具有积极影响。尽管焊缝金属的微观结构和相组成不存在根本差异，但凝固速率的降低略微提高了 SSRSW 接头拉伸剪切强度值的稳定性。为了通过评估熔核形成过程中测量的动态阻力来确定预测 SSRSW 接头质量的可靠性，对熔核直径和拉伸剪切强度值进行了比较统计分析。获得的结果并未显示这些参数之间存在任何强相关性。