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<p>The influence of the chemical composition of Cu-Ni alloys (with a&#xa0;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. The Cu-Ni alloys (with a&#xa0;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 the reduction of the welding speed from 21&#xa0;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 (CН4), in an amount of up to 4%, practically did not cause pores both during the penetration of samples and during the 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 of up to 5% nitrogen and up to 0.5% oxygen.</p>

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

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • T. B. Maydanchuk,
  • A. M. Bondarenko,
  • Ye. P. Lukianchenko,
  • S. Yu. Marynenko,
  • V. M. Ilyushenko,
  • D. M. Stepchenko

摘要

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. The Cu-Ni alloys (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 the reduction of the welding speed from 21 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 (CН4), in an amount of up to 4%, practically did not cause pores both during the penetration of samples and during the 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 of up to 5% nitrogen and up to 0.5% oxygen.