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With these units, the temperature is held to a specific value, whether the iron is in use or at rest. Temperature-controlled irons are those which have "thermostatically-controlled" mechanisms for sensing and maintaining the temperature of the tip. To protect the "tinned" surface of the tip from oxidizing, at these high temperatures, it is crucial that fresh solder be always present on the tip. Their tip temperature may approach 1,000 dg F, (about 450 dg C) while the iron is in the rest stand.
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Their main disadvantage is that while they are not in contact with a work piece, they must dissipate all their heat energy in free air, which means that they reach fairly high temperatures between soldering operations. Their heating element is a simple power resistor which is energized continuously. There are two basic classes of continuous-heat soldering irons, simple garden variety constant-power irons, and "temperature-controlled" irons.Ĭonstant-power units are comparatively inexpensive. Please submit your suggested additions and improvements to this Editor, so that they can be shared with the rest of us. Take each stated technique as a seed from which you can "grow your own". Many of the statements to follow are refutable. Much of what follows is a clean break from theory it is a highly subjective discussion of the techniques I use when soldering with a continuously hot iron. There will be a pop quiz on Friday.) Continuous - Heat Soldering Irons Feeding solder to the work alone maximizes the effectiveness of the flux, and provides a good indication as to whether or not the metals being joined have reached soldering temperature. Its flux will be used up cleaning the iron and not the work it will not be able to get through the oxides onto the bare metal surfaces.
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Solder which is applied to the iron alone and which subsequently runs down into the work will generally not involve itself in bonding. After this initial melting of solder, the application of additional solder should primarily be fed to the work pieces and not to the tip of the iron. Flux-core solder is put in contact with the work and the tip of the iron which causes a column of molten solder to flow between the iron and the work. Given ideal conditions, soldering is done in the following manner: The tip of the hot iron is put in contact with all the adjoining metals.Its resistance to chemical interaction after the solder has cooled makes it ideal for electrical work its residue is non-corrosive. Rosin Flux (used in electrical soldering) is a fairly active reducing agent when heated, but remains inert at temperatures below soldering temperatures.A chemical "reducing agent" known as flux, must be applied to all the surfaces during soldering to strip these surfaces bare of oxides, allowing the formation of pure metallic alloys. Furthermore, oxides build up very rapidly at high temperatures, insulating the hot iron from the work. Oxides on the metallic surfaces prevent wetting by the molten solder the solder cannot reach clean surface metal to alloy with it.The iron and the metals being joined must all have their surfaces in solution with the molten solder this is known as "wetting". In fact, the iron itself must be involved in the continuity of alloys. In order for heat to be efficiently transferred to the metals from a hot iron, a complete metallic path must be established between the iron and the work.If the transfer of heat is done inefficiently, a long time will elapse before the adjoining metals reach the alloying temperature during this time, considerable energy will be absorbed by the components and damage may result. Heat transfer from the hot iron to the joint of the metals must be extremely efficient to afford good soldering and to prevent damage to connected components of the work.The metals must be in firm contact with each other so that they all reach this alloying temperature. All the metals being joined must reach the "alloying temperature" in order to be soluble in molten solder.Molten solder acts as a solvent-it dissolves metal from the surface of the pieces being joined, forming a bridge of alloys from one metal to the other.In the previous discussion, we covered the principles of forming a solder bond. Smith-Kettlewell Universal NiCad Battery Charger
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Questions about this archive can be sent to TABLE OF CONTENTSĪuditory Volume Level Indicators Old and New (Part 1) Details regarding products, suppliers, and other contact information are original and may be outdated. Note: This archive is provided as a historical resource. Original support provided by: The Smith-Kettlewell Eye Research Institute and the National Institute on Disability and Rehabilitation Research
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A Quarterly Publication of The Smith-Kettlewell Eye Research Institute’s Rehabilitation Engineering Research Center