When lead-free brass is used, joining by brazing or brazing is necessary. On the other hand, the effect of added Bi and Si on brazing ability is unknown. Therefore, it is necessary to investigate in detail the effect of Bi and Si additions on the brazing wetting ability. In general, the wetting phenomenon is studied by placing molten metal on a metal sheet and measuring and investigating the wetting spread area after treatment. In this case, the specimen design (joint design) is limited to a thin metal plate. In addition, it is assumed that homogeneous wetting spread occurs. On the other hand, the penetration of molten metal into gaps during brazing in actual production is complex. Therefore, there are many cases where excessive brazing material or flux is attached, and it is desirable to analyze the penetration phenomenon and install appropriate brazing material or flux based on the analysis results.
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