ОСОБЛИВОСТІ ЗВАРЮВАННЯ НЕПЛАВКИМ ЕЛЕКТРОДОМ МІДІ МАЛИХ ТОВЩИН.

Products of thin-sheet copper are widely used in radio electronics, instrumentation, power engineering, etc. This article considers micro-plasma and TIG welding of copper with a thickness of 0.2 mm in argon and helium. As a result of the conducted research, it was established that in case of using helium as a shielding gas, the welding speed increases by more than 2 times compared to the microplasma process and by almost 5 times compared to TIG welding in argon. At the same time, the width of the weld and heat-affected zone (HAZ) decreases to 1.4…1.6 mm and 1.0…1.5 mm, respectively. Metallographic examinations of the welds did not reveal defects such as pores, cracks or lack of fusion. The weld microstructure consists of a set of equiaxed crystallites with a grain size of 4…8 μm without clearly expressed crystallization direction and with a smooth transition of the fusion line. The mechanical properties of the welded joints such as temporary resistance and microhardness were determined. Ref. 8, Fig. 7, Tab. 2 [ABSTRACT FROM AUTHOR]