Home Kovove Materialy-Metallic Materials 2019 Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 4, pp.247–265

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Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 4, pp.247–265

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.

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

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