Mechanical agitation is another possibility for disrupting the oxide layer. In the presence of metal oxides coating, the solder will not effectively wet a joint. Do not touch the tip of the soldering iron or the completed solder until it is completely cool. In metallurgy, a flux (derived from Latin fluxus meaning "flow") is a chemical cleaning agent, flowing agent, or purifying agent. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. It will only be a small amount, so it shouldn't replace other flux, but it will increase the flux coating of your wires. Getting the perfect temperature with a blowtorch may take more practice than when working with a soldering iron. Mechanical rubbing of a heated surface with molten solder can be used for coating the surface. The heat from the engine melts these salts which then can flux the passivating oxide layers on the metal components of the engine, allowing corrosion to occur at an accelerated rate. Common weak acids are used in organic acid flux, including citric, lactic, and stearic acids. All Rights Reserved. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Make sure the tubing is as small as you can get it, to ensure it shrinks tightly to the wires. Tall oil rosin finds increased use due to its higher thermal stability and therefore lower tendency to form insoluble thermal decomposition residues. Flux-less techniques are therefore desirable there. 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