Lead-free solder bars mainly have the following properties: high strength, good mechanical properties and solder joint reliability, low sensitivity to impurities, stable performance, in line with the requirements of EU directives, suitable for various welding processes, and can be widely used in various copper pipes, Welding of copper components.
Precautions for the use of lead-free tin bars:
1. Melting point of tin bar: The melting point of tin bar is related to the operating temperature, which is determined by the alloy composition itself. For example, the melting point of the commonly used tin-copper alloy is 227 degrees, and the operating temperature is generally between 270-300, while the melting point of 3.0 silver lead-free tin bars is 217 degrees, and the operating temperature is generally between 260-280.
2. Soldering furnace:—Be sure to use lead-free environmentally friendly soldering furnaces, and cannot be mixed with leaded furnaces.
3. Lead-free flux: Lead-free tin bars should be used together with lead-free flux. Lead-free flux is required to be able to withstand high temperature conditions, with good activity, and no-clean lead-free flux.
4. Liquid level height: After the tin is melted in the soldering furnace, the height of the liquid level should be maintained. There should not be too little tin in the tin bath. If necessary, lead-free tin bars should be added to the tin bath.
The difference between lead-free tin bars and leaded tin bars
In terms of appearance gloss: lead-free tin bars are light yellow; leaded tin bars are bright white.
2. From the packaging: the aluminum-free tin bar is generally a green box, and there is a ROHS logo on the box. The leaded tin bar is a gray box, and the box is marked with electrolytic tin bar or anti-oxidation leaded solder bar.
3. Differences from ingredients:
a. The composition of aluminum tin bar is composed of tin and lead. The commonly used components are Sn63Pb37. The melting point of 6337 tin bar: 183° is suitable for wave soldering and hand furnace. After selected electrolytic purification and special refining and melting special process, it is extremely The impurity elements and micro-oxidizing substances in the solder are largely removed, and a small amount of anti-oxidizing elements are added to the 6337 solder bar to ensure that the solder products have excellent quality.
b. The composition of lead-free tin bar is composed of tin, copper and silver, and the commonly used composition is Sn99.3Cu0.7. Lead-free tin bars (EU ROHS standard is less than 100OPPM lead content, Japanese standard is less than 50OPPM). Melting point of lead-free tin bar: 227°.
The difference between the use of leaded tin bars and lead-free tin bars
1. Leaded tin bars are used for the welding of leaded products.
2. Lead-free tin bars are used for welding of environmental protection or export electronic products
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