PSI - Issue 59

T. Maydanchuk et al. / Procedia Structural Integrity 59 (2024) 399–406 405 T. Maydanchuk, Y. Lukianchenko, S. Kozulin, V. Porohonko, S. Marynenko / Structural Integrity Procedia 00 (2019) 000 – 000 7 CuSn4Zn3 wire was selected as the main filler material. The microstructure of the weld joint using this material is shown in Fig. 6.

Fig. 6. Microstructure of the weld joint using CuSn4Zn3 wire.

As seen from Fig. 6, the structure of the base metal - CuZn37 brass consists of α+β phase (β phase - dark inclusions) by Freudenberger and Warlimont (2018) and Davis (2001). When CuSn4Zn3 wire was used as the filler material, the weld metal exhibited a single- phase structure of α solid solution. Macroscopic and microscopic studies of the weld joints revealed that the recrystallization zone does not exceed 2.0 mm. 4. Conclusions Based on the conducted research, the following conclusions can be drawn: 1. Restoration of brass products made of CuZn37 brass using TIG welding is possible by utilizing wires specifically designed for welding copper and its alloys. 2. According to visual inspection and radiographic examinations, the best results (absence of pores and undercut, satisfactory weld formation) were achieved when using CuSn4Zn3 and CuNiFeSiTi wires, while the worst results were obtained when using CuZn37 brass wire. 3. The results of the study showed that the strength and microhardness of all welds are lower compared to the base metal, with the greatest reduction in microhardness observed when using CuNiFeSiTi, CuSi3Mn1, and CuZn37 wires (44%, 47%, and 66.6%, respectively), and the lowest reduction when using CuSn4Zn3 wire (33%). 4. Microhardness measurements of the welds and the heat-affected zone demonstrated significant softening within a distance of up to 22-25 mm from the weld axis, which is attributed to the thermal impact of the welding process on cold-rolled brass. References Auwal, S., Ramesh, S., Yusof, F., Manladan, S.M., 2018. A review on laser beam welding of copper alloys. Int. J. Adv. Manuf. Technol. 96, 475 – 490. Davis, J.R., 2001. Copper and Copper Alloys. ASM International: Materials Park, OH, USA. DSTU 15527:2005 Copper-zinc alloys (brass) processed by pressure. Stamps. DSTU 492:2007 Nickel, nickel and copper-nickel alloys processed by pressure. Stamps.

DSTU 18175-78 Tin less bronzes processed by pressure. Stamps. DSTU 5017:2007 Tin bronzes processed by pressure. Marks.