Hi.. Everyone.
I am developing one tungsten inert gas (TIG) cladding for high temperature oxidation and wear conditions. I would like to perform the high temperature oxidation test of TIG weld clad surface. I am puzzled to resolve this matter. Due to some limitations, I am unable to coat all the 6 surfaces of a rectangular steel specimen with TIG cladding process. However, I am still interested to determine the oxidation performance of this one sided clad surface. As I can imagine that all other 5 faces will also be exposed to the oxidation environment and hence provide a clear path for the oxygen to diffuse in the clad-substrate interface. This may lead to the debonding of the cladding and inconsistencies in the test results.
Please help me to resolve this issue. Is there any method to perform the localized high temperature oxidation test? Which would allow me to test my cladding.
Thanks in advance
With Regards
Dr. Lalit Thakur
dear Lalit Thakur;
in MIG welding, when the flat characteristic power source is used, any contact with the workpiece surface would damage the electrode tip or fuse the electrode to the workpiece surface. In DC, because arc heat is distributed approximately one-third at the cathode (negative) and two-thirds at the anode (positive), the electrode is always negative polarity to prevent overheating and melting. However, the alternative power source connection of DC electrode positive polarity has the advantage in that when the cathode is on the workpiece, the surface is cleaned of oxide contamination. For this reason, AC is used when welding materials with a tenacious surface oxide film, such as aluminum.
it is also possible to form intermetallic and nitride claddings on steel surfaces by in situ melting of preplaced titanium and aluminum powder mixture under Tungsten Inert Gas (TIG) torch.
for more details can read these references;
https://www.twi-global.com/technical-knowledge/job-knowledge/tungsten-inert-gas-tig-or-gta-welding-006
Article Surface Modification of Mild Steel Using Tungsten Inert Gas ...
Dear Dr. Hameed,
Thanks for your reply. I request you to carefully read my question and it's description. I am facing problem in the oxidation test of cladding. There is no problem in doing TIG cladding. I am only able to cladding one surface of the specimen. Other five faces are open and cladding interface formed between the edges of these five faces are now open for oxidation. I need to test the oxidation of only cladded face while keeping other faces unaffected. Moreover, the second reference have also coated on two sides of a rectangular specimen. Technically their results are also not reliable as they are considering the combined oxidation of cladding surfaces and open surfaces.
what about using steam it will reduce released heat
see page 47 in this reference;
Evaluate the contribution of the fuel cladding oxidation process on the hydrogen production from the reflooding during a potential severe accident in a nuclear reactor/171
https://tel.archives-ouvertes.fr/tel-01519349/document
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