Some metals are classified as "unsolderable" in air, and have to be either coated with another metal before soldering or special fluxes or protective atmospheres have to be used. Such metals are beryllium, chromium, magnesium, titanium, and some aluminium alloys.

Conductivity – some fluxes remain conductive after soldering if not cleaned properly, leading to random malfunctions on circuits with high impedances. Different types of fluxes are differently prone to cause these issues.Harren, Natilee. Fluxus Forms: Scores, Multiples, and the Eternal Network. Chicago: University of Chicago Press, 2020. Harren, Natilee. "La cédille qui ne finit pas: Robert Filliou, George Brecht, and Fluxus in Villefranche". Getty Research Journal, no. 4 (2012), pp. 127–143. Deterioration of electrical properties of printed circuit boards, as soldering temperatures are above the glass transition temperature of the board material and flux components (e.g. glycols, or chloride and bromide ions) can diffuse into its matrix; e.g. water-soluble fluxes containing polyethylene glycol were demonstrated to have such impact [10]

Fluxus is intermedia. [131] Fluxus creators like to see what happens when different media intersect. They use found and everyday objects, sounds, images, and texts to create new combinations of objects, sounds, images, and texts. Top: Three field lines through a plane surface, one normal to the surface, one parallel, and one intermediate. The activity of the activator generally increases with temperature, up to a certain value where activity ceases, either due to thermal decomposition or excessive volatilization. However the oxidation rate of the metals also increases with temperature. Fluxus events included audience participation as a way of involving the public in the making of art. Such was the 1970 Fluxfest Presentation of John Lennon and Yoko Ono, where Maciunas made paper masks of John Lennon and Yoko Ono for the audience to wear. With this act, Maciunas shifted the role of the viewer from observer to performer .The use of the audience as the focus of the piece was a logical extension of his idea that, "anything can substitute for art and anyone can do it...the value of art-amusement must be lowered by making it unlimited, mass-produced, obtainable by all and eventually produced by all."Common fluxes are ammonium chloride or resin acids (contained in rosin) for soldering copper and tin; hydrochloric acid and zinc chloride for soldering galvanized iron (and other zinc surfaces); and borax for brazing, braze-welding ferrous metals, and forge welding.

A protective atmosphere with chemically reducing properties can be beneficial in some cases. Molecular hydrogen can be used to reduce surface oxides of tin and indium at temperatures above 430 and 470°C; for zinc the temperature is above 500°C, where zinc is already becoming volatilized. (At lower temperatures the reaction speed is too slow for practical applications.) Very low partial pressures of oxygen and water vapor have to be achieved for the reaction to proceed. [ citation needed] In soldering metals, flux serves a threefold purpose: it removes any oxidized metal from the surfaces to be soldered, seals out air thus preventing further oxidation, and by facilitating amalgamation, improves wetting characteristics of the liquid solder. [6] Some fluxes are corrosive, so the parts have to be cleaned with a damp sponge or other absorbent material after soldering to prevent damage. Several types of flux are used in electronics. [7] Bombardment with atomic particle beams can remove surface layers at a rate of tens of nanometers per minute. The addition of hydrogen to the plasma [ which?] augments the removal efficiency by chemical mechanisms. [ citation needed] Stewart Home, The Assault on Culture, The origins of Fluxus and the movement in its 'heroic' period, Chapter 9". Archived from the original on 2 June 2009 . Retrieved 16 June 2012. The flux most commonly used in iron and steel furnaces is limestone, which is charged in the proper proportions with the iron and fuel.

Bloch, Mark. "The Boat Book: Alison Knowles" ". Archived from the original on 3 July 2017 . Retrieved 7 July 2015. Laynor, Gregory (2016). The Making of Intermedia: John Cage to Yoko Ono, 1952 to 1972. Vol.78-03A. University of Washington. English, Brian Reed. Ann Arbor. pp.(94). ISBN 978-1-339-94191-2. OCLC 1257952914. {{ cite book}}: CS1 maint: location missing publisher ( link)

Other reactive atmospheres are also in use. Vapors of formic acid and acetic acid are the most commonly used. Carbon monoxide and halogen gases (for example carbon tetrafluoride, sulfur hexafluoride, or dichlorodifluoromethane) require fairly high temperatures for several minutes to be effective. [ citation needed] Tate Archive and Public Records Catalogue". Archived from the original on 23 April 2021 . Retrieved 8 July 2015.

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Fluxus und Freunde: Sammlung Maria und Walter Schnepel, Katalog zur Ausstellung Neues Museum Weserburg Bremen; Fondazione Morra, Napoli; Kunst Museum Bonn 2002. Paull, Silke, and Hervé Würz, eds. "How We Met or a Microdemystification". AQ 16 [Special Issue], (1977) The name was defined by Lithuanian / American artist George Maciunas in 1961, derived from the Latin word Fluxus, which means flowing, a reference the ever-changing nature of the group and its varying activities. He described the group as ‘the fusion of Spike Jones, vaudeville, gag, children’s games and Duchamp.’ Among the various group members were Joseph Beuys, Nam June Paik, John Cage, Daniel Spoerri and Yoko Ono. The Origins of Fluxus Organic fluxes are unsuitable for flame soldering and flame brazing, as they tend to char and impair solder flow. The name Fluxus, meant to suggest both “flow” and “effluent,” was coined by Fluxus founder George Maciunas (1931–78), a Lithuanian American designer and “cultural entrepreneur.” Maciunas used the word fluxus to describe a wide range of his activities, from a published call for a common front of artists against culture to a New York artists’ housing association, as well as a publishing concern that produced ephemeral interactive multiples and staged live events called Happenings that were precursors to performance art, video art, and other progressive art forms.