Classification of the soldering process by energy carrier s. 68 Until 450°C soft-soldering Above 450°C hard-soldering 900°C high temperature-soldering (in vacuum or inert gas) The stability of hard-soldering components is often not as good as the stability of bonding-connections but it´s still higher than the stability of soft-soldering work pieces. Solder The material you need to get a soldering connection is called solder. solders are often alloys as a wire or as a soldering paste. They often include fluxes. Fluxes In order for the above-described diffusion process to take place, all metal surfaces must be bright and free of oxides and soiling. Almost without exception, air is used for heating the solder joint, which is an oxidation of the surfaces, which compromises a reliable and thus successful soldering. Therefore, in such cases, a flux is applied before the brazing operation. The flux reduces (deoxidizes) the surface during soldering and is intended to prevent the reoxidation before and during the soldering process, which otherwise would greatly reduce the flow and wetting properties and also to reduce inclusions of foreign substances. Another effect is the reduction of the surface tension of the
Classification of the soldering process by energy carrier s. 68 Until 450°C soft-soldering Above 450°C hard-soldering 900°C high temperature-soldering (in vacuum or inert gas) The stability of hard-soldering components is often not as good as the stability of bonding-connections but it´s still higher than the stability of soft-soldering work pieces. Solder The material you need to get a soldering connection is called solder. are often alloys as a wire or as a soldering paste. They often include fluxes. Fluxes In order for the above-described diffusion process to take place, all metal surfaces must be bright and free of oxides and soiling. Almost without exception, air is used for heating the solder joint, which is an oxidation of the surfaces, which compromises a reliable and thus successful soldering. Therefore, in such cases, a flux is applied before the brazing operation. The flux reduces (deoxidizes) the surface during soldering and is intended to prevent the reoxidation before and during the soldering process, which otherwise would greatly reduce the flow and wetting properties and also to reduce inclusions of foreign substances. Another effect is the reduction of the surface tension of the solders