Weldability of Cu–Ni alloys with nickel content up to 6%

Keywords

Cu–Ni alloys, welding, heat affected zone (HAZ), mechanical properties, structure, cracks, pores.

Cite as

Maydanchuk T. B., Bondarenko A. M., Lukianchenko Ye. P., Marynenko S. Yu., Ilyushenko V. M., and Stepchenko D. M. Weldability of Cu–Ni alloys with nickel content up to 6%. Physicochemical Mechanics of Materials. 2025. 61(2), 089-094.

https://doi.org/10.15407/pcmm2025.02.089

Abstract

The influence of the chemical composition of Cu–Ni alloys (with a nickel content of up to 6%) and gas impurities in the shielding gas (argon) used for TIG welding on the crack growth resistance and porosity of the metal was investigated. It was found that Cu–Ni alloys growth (with a nickel content of up to 6%) containing 0.9% aluminum and more than 0.02% phosphorus were most susceptible to cracking. It was found that reduction of the welding speed from 21 m/h to 12 m/h led to an increase in the susceptibility of alloys to cracking, re­gardless of the composition of the alloys under study. The natural gas (СН₄), in an amount of up to 4%, practically did not cause pores both during the penetration of samples and during welding of joints. The alloys containing 0.9% aluminum or 0.9% manganese demonstrated the highest resistance to pore formation at the protective gas (argon) concentration up to 5% nitrogen and up to 0.5% oxygen.

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