Abstract No.:
7194

 Scheduled at:
Tuesday, June 21, 2022, Saal Brüssel 12:00 PM
Furnace brazing


 Title:
Effect of specimen joint design on wetting phenomenon by in-situ observation method

 Authors:
Hikaru Tajima* / Tokai University, Japan
Yasuyuki Miyazawa / Tokai University, Japan
Kyohei Furihata/ Kitz Metal Works Corporation, Japan
Kazuhito Kurose/ Kitz Metal Works Corporation, Japan

 Abstract:
When lead-free brass is used, joining by brazing or soldering is necessary.
On the other hand, the effect of added Bi and Si on brazing and soldering ability is unknown.
Therefore, it is necessary to investigate in detail the effect of Bi and Si additions on the brazing and soldering 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 and soldering 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.
Therefore, analysis of the complex penetration phenomena is essential to obtain a sound brazed part.
From previous studies, it has been shown that the in-situ observation method is effective for investigating the penetration phenomena. So far, the appropriate specimen joint design has not been clarified. In this study, a new specimen joint design was devised to simulate an actual brazed joint, and in-situ experiments were conducted to analyze the behavior of the molten brazing material in detail.
We proposed a specimen called the groove specimen and conducted experiments.
The results showed that the behavior of the molten solder was different depending on the base material. In addition, it was confirmed that the way the solder wets varied depending on the joint design of the specimen.


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