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2021 №07 (01) DOI of Article
2021 №07 (03)

The Paton Welding Journal 2021 #07
TPWJ, 2021, #7, 7-12 pages

Influence of oxygen concentration in argon of the protective nozzle on the properties and colour of weld surface in TIG welding of titanium

V.P. Prilutskyi and I.K. Petrichenko
E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

The paper presents the results of investigations of the process of formation of a gas-saturated layer on the weld surface at accidental violation of the conditions of argon protection (under the nozzle) in TIG welding of VT1-0 titanium. It was found that the change of oxygen content in argon of the protective nozzle in the range from 0.024 to 1.18 vol.% leads to a change of the colour of a region of forming weld surface. It is shown that each colour corresponds to a certain depth of the gas-saturated layer that can be up to 0.25 mm. A correlation dependence of weld surface colour–gas-saturated layer thickness–oxygen content in the protective nozzle was established. Results of gas analysis and mechanical testing of the welds show that oxygen and nitrogen from the air in the argon of the protective nozzle practically do not interact with the molten metal of the weld pool during welding. Therefore, the quantitative characteristics of the metal of welds are on the level of those of the welds produced under standard conditions. To increase the operational reliability of welded assemblies with a coloured surface of a weld region, it is proposed to remove it, depending on its colour, to the depth in the range from 0.10 up to 0.25 mm. 9 Ref., 2 Tables, 6 Figures.
Keywords: argon-arc welding (TIG), VT1-0 titanium alloy, weld surface colour, violation of argon protection, weld metal properties

Received 05.05.2021


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