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Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 4, pp.247–265 |
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Title: Effect of shielding gas on the properties of CP titanium Grade 2 laser weld joints | ||
Author: M. Vyskoc, M. Dománková, M. Sahul, M. Vyskocová | ||
Abstract: The paper deals with the evaluation of the shielding gas influence on the properties of titanium Grade 2 weld joints produced with disk laser. Butt weld joints were produced under different shielding gas types, namely Ar, He, Ar + 5 vol.% He, Ar + 30 vol.% He, and without shielding weld pool. Light and electron microscopy, microhardness measurements, computed tomography, and tensile testing were used for evaluation of weld joint properties. He-shielded weld joints were the narrowest ones. On the other hand, Ar-shielded weld joints exhibited the largest weld width. The choice of shielding gas had a significant influence on the porosity of welds. The lowest porosity was observed in the weld joint produced in Ar with the addition of 30 vol.% He shielding atmosphere (only 0.03 %), while the highest level of porosity was detected in weld joint produced without shielding gas (0.76 %). Except for unshielded titanium Grade 2 weld joint, the lowest tensile strength was recorded in Ar-shielded weld joints. On the contrary, the highest average microhardness, except unshielded weld joint, was measured in He-shielded weld joints. |
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Keywords: disk laser, laser welding, commercially pure titanium Grade 2, shielding gas, porosity | ||
Published online: 25-Jun-2019 | ||
Year: 2019, Volume: 57, Issue: 4 | Page From: 247, Page To: 265 | |
doi:10.4149/km_2019_4_247 |
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