Metal oxide nanoparticle-based coating as a catalyzer for A-TIG welding : critical raw material perspective

Baloš, Sebastian (author), Dramićanin, Miroslav D. (author), Janjatovic, Petar (author), Zabunov, Ivan (author), Klobčar, Damjan (author), Bušić, Matija (author), Grilli, Maria Luisa (author)

Besides a wide application in corrosion protection, wear resistance increase, providing thermal properties and power conversion, oxide coatings have found an alternative application in welding technology as catalysts of the tungsten inert gas (TIG) welding process. In this paper, the novel approach of fabricating a coating containing nanoparticles based on nanosized SiO$_2$ and TiO$_2$ and their mixtures was applied to the austenitic stainless-steel base metal. It was found that coatings increased depths of penetration, enabling a consumable-free welding. Using this method, the use of several critical and near-critical raw materials (e.g., Si and Cr), as well as the relatively expensive Ni can be completely avoided. The most effective coating in terms of weld penetration consisted of a mixture of nanoparticles, rather than unary oxide coatings based on nanoparticles. A model for liquid weld metal flow is proposed based on the metallographic examination of recrystallized grains and microhardnesses measured near the weld metal, supporting the reversed Marangoni convection theory.

• Language: English
• Keywords: oxide coating, nanoparticles, TIG welding, penetration depth
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2019
• Number of pages: 12 str.
• Numbering: Vol. 9, iss. 5, art. 567
• PID: 20.500.12556/RUL-132329
• UDC: 621.791(045)
• ISSN on article: 2075-4701
• DOI: 10.3390/met9050567
• COBISS.SI-ID: 16623131
• Publication date in RUL: 21.10.2021

Record is a part of a journal

• Title: Metals
• Shortened title: Metals
• Publisher: MDPI AG
• ISSN: 2075-4701
• COBISS.SI-ID: 15976214

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 15.05.2019

Secondary language

• Language: Slovenian
• Keywords: oksidne prevleke, nanodelci, varjenje TIG, globina penetracije

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: COST
• Name: Solutions for Critical Raw Materials under Extreme Conditions