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Bare Copper Wire Art Material
Soldering iron
Irons for electrical or electronics work
Electric soldering iron
For electrical work, wires and various electronic components are soldered to printed circuit boards, other wires, and small terminals. A low-power iron (15-30 watts) is suitable for this work. In earlier days wires were frequently soldered to large chassis made of heavy metal, but this high-power requirement is now rare. Higher power is used for non-electrical metal-work.
Small battery-operated or gas soldering irons are useful when there isn a convenient source of electricity.
Some soldering irons have interchangeable tips for different types of work. Pyramid tips with a triangular flat face and chisel tips with a wide flat face are useful for soldering sheet metal. Fine conical or tapered chisel tips are typically used for electronics work.
Stands for irons
Soldering iron station
A soldering iron stand keeps the iron away from flammable materials, and often also comes with a celulose sponge and flux pot for cleaning the tip. Some soldering irons for continuous and professional use come as part of a soldering station, which allows the exact temperature of the tip to be adjusted, kept constant, and sometimes displayed.
Heat the work piece as well as the solder applied to it. This helps to prevent "cold joints", where hot solder is applied by the iron to a relatively cold target, shrouding it in solder to look like a good joint, but without wetting it properly, and without forming a good connection.
Some electrical solder contains flux cores (the purpose of the flux is to clean the oxides off the metals to permit a good joint). If the solder is applied to the iron first then the flux is rapidly burnt off (the wispy white smoke you get from the tip of the iron) and cannot serve its purpose on the joint. In heavier applications, including plumbing, flux is normally applied completely separately.
Temperature-controlled soldering station
Temperature-controlled soldering station
A JBC digital soldering station working on a 0402 component.
A temperature-controlled soldering station is a complete unit usually used for soldering electronic components, and consisting of an electrical power supply, a soldering iron, and is different for lead-based and lead-free solders. Lead-based solder uses 250 C to 280 C or 300 C while lead-free soldering needs a higher temperature, about 350 C to 400 C.
A variety of means are used to control temperature.
The simplest of these is a variable power control, much like a light dimmer, which together with the loss of heat from the iron to the environment roughly sets the temperature.
More complex is some form of thermostat, which is often inside the tip itself, which switches power on and off to the elements.
Another approach to use magnetized soldering tips which lose their magnetic properties at a certain temperature (the Curie point). As long as the tip is magnetic, it clings to the heating element. At the design temperature, it loses contact, cooling down.
Other complex irons similar to those produced under the Metcal brand, circulate a high frequency AC current through the tip, and using magnetic physics to direct heating only where the surface of the tip drops below the Curie point.
The most advanced soldering irons are digital and control temperature via a microprocessor in the station that monitors a thermocouple inside the tip, increasing or decreasing the power on the tip based on the selected temperature. Brands like JBC and a few models from ERSA and Weller use this heating system.
Cleaning
When burnt flux and oxidized material begins to accumulate on the tip, it blocks heat transfer and contaminates the joint, making soldering difficult or impossible. Many soldering stations come with a cellulose sponge which is dampened, and used to wipe the hot iron's tip clean. Wet denim performs the same job but may wear down the tip. A wire brush or wire wheel (mounted on a bench grinder) is sometimes used to carefully remove very severe oxidation, though this may risk damaging the tips protective iron plating. A small amount of fresh solder is usually then applied to the clean tip in a process called tinning. The working surface of the tip is usually kept tinned (coated with wet solder) to minimize oxidation. Oxidation blocks heat transfer, corrodes the tip and contaminates the joint.
Tip design
Unplated
Older and very cheap irons typically use a bare copper tip, which is shaped with a file or sandpaper. This dissolves relatively rapidly into the solder, suffering pitting and erosion of the shape.
Plated
Recent soldering iron tips tend to be plated copper, to increase the lifetime by many times. The plating resists erosion by the molten solder, which is especially severe at high temperatures needed for modern lead-free solders.
Soldering iron tip maintenance
Bare copper tips that are repeatedly resurfaced, as typically found on old high power irons, can last decades in use, and the shaft of the copper tip is prone to corrosion over such long times. It is therefore best practice to remove and wire-brush the bit to remove shaft corrosion about once a decade, to maintain effective thermal contact with the iron.
With the very few irons that use a steel tip, this needs carrying out more frequently, as tip shaft corrosion (rust) is liable to break the iron.
Ready made tips for old irons are not always available. When needed, replacements are made from any suitable piece of copper, or if necessary a copper alloy.
Other uses
Soldering irons can be used for many tasks that require a controlled source of heat. This will often damage the iron, or make it difficult to use for its proper purpose.
These include:
pyrography - Burning designs into wood.
plastic welding - using the iron to melt and join plastics.
hot-wire foam cutter - Cutting foam with a hot wire
See also
Solder
Soldering
Soldering gun
Brazing - Joining metals structurally by the use of a higher temperature joining alloy than solder.
Welding - Melting two objects to be joined into each other.
ColdHeat - A simple 'instant heat' soldering iron
References
External links
Basic Soldering Guide A good portion of this site is devoted to the tools to use while soldering and their care
The Art of Soldering
Categories: Electronics work tools | Brazing and solderingHidden categories: Articles lacking sources from December 2007 | All articles lacking sources | Articles to be merged from January 2010 | All articles to be merged
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