Development of a fundamental technology for repairing products made of CuZn37 brass through TIG welding

Abstract

Comprehensive research was conducted to assess the feasibility of repairing CuZn37 brass products using the Tungsten Inert Gas (TIG) welding process. Standard welding wires designed for copper and its alloys (4 wire grades) were used as filler materials. The research on the macro- and microstructure of the weld joints revealed that the recrystallization region did not exceed 2 mm. The single-phase α-solid solution structure was characteristic of the welds made with CuSn4Zn3 filler wire. Microhardness measurements of the welds and the heat-affected zone showed significant softening up to 22-25 mm from the weld axis due to the thermal influence of the welding process on cold-rolled brass.

As a result of the comprehensive research, a fundamental technology for repairing CuZn37 brass products using TIG welding with CuSn4Zn3 filler wire was developed. This approach ensures high-quality defect-free weld joints, dense welds with satisfactory mechanical properties, and a minimal zone of softening.