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Manladan et al provided an overview of RSW in aluminum alloys, discussing challenges like intermetallic compound formation and the importance of surface preparation and post-weld cleaning in achieving good weld quality [15].
A review on resistance spot welding of aluminum alloys.
Resistance Spot Welding of 7075 Aluminium Alloy.
Journal of Materials Engineering and Performance, 21(5), 748–755. doi:10.1007/s11665-012-0189-0
International Journal of Advanced Manufacturing Technology, 76(9-12), 1993-2003.

The aluminum scrap of 6xxx series alloys was collected from a machining workshop in Norway.
It can be seen that the scrap sample from the workshop contains different aluminum alloys (Fig. 5).
This heterogeneous characteristic of the present aluminum scrap, i.e. mixture of aluminum alloys, results in obvious challenges for the solid state recycling process.
Noda: Journal of Electron Microscopy Vol. 51 (2002), p.
Korevaar: Journal of Materials Science Vol. 26 (1991), p. 1431

Producers of secondary raw materials composed of salts, halide compounds and oxides are metallurgical enterprises, including those producing aluminum and silicon.
The composition of melted alloys, the furnace gas cleaning technology and the exhaust fume capture technology influence the properties of waste products.
The TIG welding makes it possible to obtain high quality joints from steels of various grades, including high-alloyed ones, as well as non-ferrous metals and their alloys [17-25].
The third composition - nanosilica – was composed of silicon compounds of an ultrafine fraction with a particle size of 40-80nm.
Méndez, Surface modification of ductile iron produced by an innovative in-situ casting technique, International Journal of Cast Metals Research. 33(23) (2020) 103111

Thus, the aim of this study was to investigate on the influence of Nd2O3 doped boro-tellurite glasses and the role of alkaline metal oxide.
The compounds were mixed together and milled for an hour in order to produce a homogeneous mixture before being placed in porcelain crucible.
Journal of Luminescence, 183, 79-88
Journal of Luminescence, 175, 57-66
Journal of Alloys and Compounds, 465(1-2), 333-339

Zhong: Journal of Electronic Materials, Vol. 37 (2008), 469-476
Ye: International Journal of Solids and structures, Vol. 40 (2003), 7315-7327
Chan: Journal of Alloys and Compounds, Vol. 392 (2005), 237-246
Mittermeijer: Journal of Electronic Materials, Vol. 34 (2005), 137-142
Kao: Journal of Electronic Materials, Vol. 34 (2005), 27-33

At the same time, research directions №2 and №4 are actual since they are aimed at wastelessness of engineering and metallurgical enterprises, but for welding of critical structures these welding materials are allowed only in rare cases.
Thus, welding fused flux compounds manufactured by granulation with electric arc of favorable spherical shape has homogenous chemical composition, it is not hygroscopic with strong granules.
In addition, if carbides or ferro-alloys of metals are added to the rock furnace burden, it is possible to dope granules thus to produce doped fused welding flux, but it requires inert atmosphere and further investigation.
Festus, Mixture experiments and their applications in welding flux design, Journal of the Brazilian Society of Mechanical Sciences and Engineering, 30 (2008)
Atuanya, Formulation of a Metal Arc Welding Flux with a Potash Enriched Sodium Silicate Binder, Journal of Emerging Trends in Engineering and Applied Sciences, 3 (2012) 497-501

Conclusion After studies performed, in the laboratory stage, the following conclusions were drawn: - processing of sideritic waste studied (those resulting from the processing plant Teliuc), in order to obtain precious metals (particularly gold) requires an elimination in advance of the light fractions (it is considered the much higher heavier of precious metals compared to the others that accompanying the ore); - it is also preferably a magnetic concentration, which aims to eliminate the iron-based compounds; - acids used in the preparation of the royal water must have a proper concentration, preparing the necessary quantities immediately (it was found that in time, the royal water loses its properties); - a future direction of research would be considered the processing of a larger quantity of waste (20kg) by treatment with cyanide, which can be processed in order to achieve the pursued objective: the recovery of precious metals (typically Au, possible Ag).
Cebulski, E-waste as a source of valuable metals, International Scientific Journal, 63 (2013) 87-92
Knödler, Gold, Gold Alloys, and Gold Compounds, Ullmann's Encyclopedia of Industrial Chemistry, 2005.

If no chemical compounds containing A4 are formed on the surfaces which are in contact with the liquid metal, then the values of D1(2) and D2(1) will not depend on x4.
The formation of compounds of this type occurs when the oxygen concentration in Na reaches the so-called threshold concentration for the formation of a complex oxide.
For each compound at a given temperature, there is a strictly defined value for this parameter.
Russier, Liquid Metals for Nuclear Applications, Journal of Non. 353 (2007) 3600
Potapova, Corrosion Resistance of V-4Ti-4Cr Alloy in Convection Flow of Eutectic Na-K Alloy, Inorganic Materials: Applied Research. 6 (2015) 133

This paper is aimed at making an attempt to fill this gap by presenting the results of simulating the magnetic hysteresis loops of X30Cr13 stainless steel.
Ge, Journal of Alloys and Compounds 509 (2011) 1760–1767
Ai, International Journal of solids and Structures 50 (2013) 672–679
Szewczyk, Journal of Physics D – Applied Physics 40 (2007) 4109–4113
Ai, International Journal of Solids and Structures 50 (2013) 672–679

The reductive electropolymerization has been used in on inert substrates, such as Pt, Pd and also as an alternative to corrosion protection of active materials such as Nd-Fe-B magnets, Fe-Ni alloys and stainless steels [1-5].
Were reported binding energies for Ru2+ containing compounds that vary from 279.50 to 281.80 eV for [Ru(en)3]ZnCl4 and Ru(NH3)5CO](PF6)2, respectively [13].
The Ru3+ containing compounds have higher biding energy than that observed to Ru2+ and obviously it is also affected by the coordination environment.
This probably arises from the film acting as a reducing agent, reducing some of the alloy active phase.
Paula, Journal of Materials Chemistry, 8(9), (1998), p. 2049