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Solder is a fusible metal alloy used to create a permanent bond between metal workpieces. It is used in electrical and electronics work to attach components to printed circuit boards (PCBs). Traditional solder is made of lead and tin, but due to concerns about the health and environmental effects of lead, lead-free solder alloys are becoming more common. These alloys typically contain tin and other metals such as silver, copper, nickel, and antimony. Lead-free solders have higher melting points, which can cause increased stress on components during assembly and weaker joints.
| Characteristics | Values |
|---|---|
| Definition | Solder is a fusible metal alloy used to create a permanent bond between metal workpieces |
| Composition | Solder is made of lead, tin, and/or flux. Lead-free solders are also available and are made of an alloy of other metals, such as silver, copper, nickel, and antimony. |
| Melting Point | Soft solder typically has a melting point range of 90 to 450 °C (190 to 840 °F; 360 to 720 K). Alloys that melt between 180 and 190 °C (360 and 370 °F; 450 and 460 K) are the most commonly used. |
| Uses | Solder is used in electrical and electronics work, plumbing, and sheet metal work. In electronics, it is used to attach components to printed circuit boards (PCBs) and fuse wires for circuit components. In plumbing, it is used for leak-free connections. |
| Types | Tin-antimony solder, copper-tin solder, silver-bearing solder, lead-based solder, and lead-free solder are some common types. |
| Flux | Flux is used to reduce oxidation and improve the wetting properties of the solder. Rosin flux is commonly used for electronics due to its low corrosiveness, while acid flux is used for metal joining and plumbing. |
| Advantages | Solder provides a strong bond between metals and has favourable conductive properties. |
| Disadvantages | Lead-based solder can be harmful to health and the environment, leading to regulatory restrictions and the development of lead-free alternatives. |
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What You'll Learn
Traditional solder is made from lead and tin
The use of lead and tin in solder dates back many years and has been the standard used across the electronics industry. Lead-based solder was what kicked off the electronics revolution. The most common mixture is a 60/40 blend of tin and lead, with a melting point of around 180-190°C. This is known as soft solder. Tin is selected for its lower melting point, and lead is used to inhibit the growth of tin whiskers.
The higher the concentration of tin in the alloy, the better the tensile and shear strengths of the solder. Lead-free solders have higher melting points, which can cause increased stress on components during assembly. They also do not flow as well as lead-based solders, and joints tend to be weaker. However, due to concerns about the health and environmental effects of lead, the use of lead-free solder has become more common.
Today, lead-free solder is available to comply with regulations such as the Safe Water Drinking Act, which restricts the amount of lead used in portable water systems. Tin-antimony solder, for example, contains 95% tin and 5% antimony and is lead-free. It is safe for water supply lines and designed for use in plumbing applications where extreme temperature changes and vibrations occur.
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Lead-free solder is now common, made from an alloy of metals
Solder is a fusible metal alloy used to create a permanent bond between metal workpieces. It is a blend of tin, lead, and/or flux. Lead-based solder was the industry standard in electronics manufacturing for several decades. However, due to concerns about the health and environmental effects of lead, the use of lead-free solder alloys has become common.
Lead-free solder is now widely used in consumer electronics. It is made from an alloy of metals, with tin as the most common base. Tin provides strength to the alloy and has favourable conductive properties. Other metals that may be included in lead-free solder alloys include silver, copper, nickel, and antimony.
The increased use of lead-free solder is partly due to regulatory requirements, such as the EU's Restriction of Hazardous Substances directive (2006), which restricts the use of lead alloy solder in consumer electronics. In the US, manufacturers may also receive tax benefits for using lead-free solders.
Lead-free solders have higher melting points than lead-based solders, which can cause increased stress on components during assembly. They also do not flow as easily, resulting in weaker joints. To address these issues, manufacturers have developed solders with unique properties, such as the addition of nickel to mitigate the formation of tin whiskers.
Overall, the shift towards lead-free solder alloys made from an alloy of metals reflects a balance between regulatory compliance, health and environmental considerations, and the need for effective soldering properties in various applications.
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Tin is the most common base metal
Solder is a fusible metal alloy used to create a permanent bond between metal workpieces. It is a blend of tin, lead, and/or flux. Tin is the most common base metal in lead-free solders, which have become more common due to regulatory requirements and the health and environmental benefits of avoiding lead-based products. Lead is a poisonous substance that is very harmful to humans and the environment.
Tin is chosen for its lower melting point, which makes it especially easy to work with. The higher the tin concentration, the better the tensile and shear strengths. For example, a 60/40 blend of tin and lead is a common mixture with a melting point of around 180-190°C. This blend is known as a soft solder.
Tin-antimony solder, which contains 95% tin and 5% antimony, is lead-free and safe for water supply lines. It is designed for use in plumbing applications where frequent extreme temperature changes and vibrations occur, such as refrigeration, cooling equipment, and heat ducts. It is also used to solder electronics. Copper-tin solder, which contains 97% tin and 3% copper, is another lead-free option that is safe for water supply lines and is designed for sweating copper and brass plumbing joints.
Tin-lead solders are still commercially available with tin concentrations between 5% and 70%. Lead is used to inhibit the growth of tin whiskers, although the precise mechanism for this is unknown. Today, there are many techniques used to mitigate the problem of tin whiskers, including changes to the annealing process, the addition of elements like copper and nickel, and the application of conformal coatings.
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Other metals used include silver, copper, nickel and antimony
Solder is a fusible metal alloy used to create a permanent bond between metal workpieces. It is a blend of tin, lead, and/or flux. Traditional solder is made of lead and tin. Lead-free solder alloys are also available, made of an alloy of lead and other metals.
Other metals used include silver, copper, nickel, and antimony. Silver provides mechanical strength but has lower ductility than lead. Silver soldering, or brazing, is performed using alloys with a melting point above 450 °C (840 °F; 720 K). Silver was first added to solders made of lead-based alloys to avoid silver migration. Silver-bearing solder contains silver, copper, bismuth, and tin.
Nickel in solder alloy can protect the under-bump metallization (UBM) layer from dissolution. It is also added to mitigate the problem of tin whiskers, along with changes to the annealing process, conformal coatings, and the addition of copper. Antimony increases mechanical strength without reducing wettability and prevents tin pest.
Copper is also used in copper-tin solder, which is designed for sweating copper and brass plumbing joints.
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Lead-free solders have higher melting points
Traditional solder is made of lead and tin. Lead-free solder, on the other hand, is an alloy of tin and other metals such as copper, silver, nickel, and zinc. Tin with copper is the most commonly used combination. Lead-free solder generally has a higher melting point than conventional solder. While leaded solder has a fixed melting point of around 180-190°C, the melting point of lead-free solder may range from 50°C to 200°C or higher, with some sources giving a range of 50°C to 218°C.
The higher melting point of lead-free solder has several implications. Firstly, it introduces increased stress on components during assembly. Secondly, it affects the components on the circuit board and can cause the tearing of tracks. Lead-free solder is not suitable for use with low dielectric components as they cannot withstand heat damage. Additionally, the higher melting point can lead to rapid oxidation of the solder joints.
To address these challenges, manufacturers have developed solders with unique properties. For example, tin whiskers, which are a concern with lead-free solder, can be mitigated by using newer annealing techniques, incorporating additives such as nickel, and using conformal coatings. Bismuth can also be added to lower the melting point and improve wettability. Rosin-containing solders tend to perform better with lead-free solders, and more aggressive and longer-lasting fluxes are required to keep the surfaces being soldered clean and free from oxidation.
While lead-free solder offers advantages in terms of health and environmental concerns, it lacks some of the desirable physical properties of lead-containing alloys. It has lower wettability, which can lead to more defects and poorer contact resistance performance. Lead-free solder is also harder than lead solder, which can affect joint reliability.
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Frequently asked questions
Solder is a fusible metal alloy used to create a permanent bond between metal workpieces.
Traditional solder is made of lead and tin. Lead-free solders are now more common, and these are made of an alloy of tin and other metals such as silver, copper, nickel and antimony.
Lead-free solders have a higher melting point than lead-based ones. This can cause increased stress on components during assembly and they do not flow as well.
Alloys commonly used for electrical soldering are 60/40 Sn-Pb (tin-lead) and 63/37 Sn-Pb.
