2021 Volume 60 Issue 1 Pages 202-206
Brass has excellent ductility and workability. Lead–free brass containing Bi and Si has been put into practical use in order to comply with environmental regulations such as water quality standards. For actual use, brass soldering with lead–free solder is required. On the other hand, on–site soldering is generally done using a torch as a heat source. In this torch soldering, a pure Cu pipe is inserted into a brass valve to heat the torch. At this time, heating is performed only from the brass valve side. As a result, the heating becomes uneven, which is different from the general soldering process of furnace brazing.
The purpose of this study was to develop a new test piece and analyze the behavior of molten solder and molten brazing material during joining through in–situ observation experiments.
In this investigation, we proposed a test piece called a groove specimen. The behavior of the molten solder was analyzed using the groove specimen. By installing solder on one side of the groove specimen and heating it, the solder melted and entered the groove. The movement of the molten solder at this time was observed and summarized.
As a result of the experiment, it was confirmed that the behavior of the molten solder differs depending on the base material. Also, there was a difference in the wetting of the solder between the upper part, the middle part, and the lower part in the groove specimen. This was suggested to be different because the shape of the groove specimen was different in each part.
