【 JJY 】 The melting point of solder paste is closely related to the composition of the soldering alloy

Solder pasteissmtSolder auxiliary materials indispensable in the surface mount technology (SMT) process. According to environmental protection standards, it can be divided into lead-free solder paste and leaded solder paste. The melting point of solder paste is closely related to the composition of the soldering alloy. The following solder paste manufacturers have summarized the melting points of solder pastes made of different alloys as follows:

The melting point of solder paste for tin-copper alloy is227℃;

Tin, silver, copper3.0The melting point of silver alloy solder paste is217℃;

Tin, silver, copper0.3The melting point of silver alloy solder paste is227℃;

The melting point of tin-bismuth alloy solder paste is138℃;

Tin lead6337The melting point of alloy solder paste is183℃

The melting point of tin-bismuth-silver alloy solder paste is172℃;

The above melting points all refer to the melting points of solder products with conventional alloy proportions in the market. The melting point refers to the temperature at which a certain substance changes from a solid to a liquid state. However, in the use of soldering products, we need to adjust the temperature of the heating tool to a temperature much higher than this.

Melting point217℃-227℃When using the solder paste, the reflow soldering temperature should be adjusted to240℃-260℃;

Melting point172℃When using the solder paste, the reflow soldering temperature should be adjusted to210℃-230℃;

Melting point138℃When using the solder paste, the reflow soldering temperature should be adjusted to165℃-185℃;

Melting point280℃When using the solder paste, the reflow soldering temperature should be adjusted to320℃Left and right;

The melting point of lead-containing solder paste is183℃When in use, the reflow soldering temperature should be adjusted to210℃-230℃;

The operating temperature of soldering is several tens or even hundreds of degrees higher than its melting point to reach the melting point and achieve complete melting. The operating temperature of solder paste is also closely related to the equipment used for soldering operations, the size of the soldered parts, and the material of the soldered parts.

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