Flux: a chemical substance that can help and facilitate welding process in the welding process, and has protective effect and prevents oxidation reaction. The flux can be divided into solid, liquid and gas. There are mainly “auxiliary heat conduction”, “removing oxide”, “reducing the surface tension of the welded material”, “removing the surface oil of the welded material, increasing the welding area”, “preventing the reoxidation” and so on. In these aspects, two key roles are: “removing oxide” and “reducing the being” Surface tension of welding material.
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