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By ginkgo | 10 August 2022 | 0 Comments

What is the difference between solder paste, solder wire and solder bar? How should we choose?

First ,The difference between solder paste, tin bar, and tin wire
1. From the appearance

In terms of appearance, the three are well differentiated - solder paste is a paste-like product made of solder alloy, which is gray-white. Solder paste is generally sold in cans, 500g a can; tin bars are strip-shaped products, one by one, mainly in boxes, about 20kg per box; tin wires are rolled up and shaped like iron wires.
2. From the perspective of composition
Solder paste is mainly composed of tin powder, flux and activator, which can be directly used in the welding process; tin wire was not added with flux in the early days, and today's tin wire is also added with flux, which can be directly welded; Unlike solder paste and solder wire, tin bar is made of pure tin without adding flux, so when wave soldering, flux should be added in front.
Second, the use of solder paste, tin bar, tin wire
Solder paste, tin wire and tin strip are all important materials required in welding, and they all play an important role in their respective fields, and there is no substitute for them.
Solder paste is generally wettable and contains flux components, which can isolate the air to prevent oxidation. There are two types of lead solder paste and lead-free solder paste, which are mainly used in SMT, hot air, hotbar, and laser welding;
Tin bars can be divided into lead tin bars and lead-free tin bars. They are generally used for dip soldering, DIP and wave soldering. They have good wettability, good fluidity, easy tinning, bright and full solder joints, and oxidation resistance. strong characteristics. Since the tin bar is made of pure tin, there is less tin dross, which can improve the utilization rate;
Solder wires generally do not contain flux, and different types of tin wires have different fluxes. It is mainly used in soldering iron, hotbar, laser welding, etc. It is especially suitable for heating while feeding tin. It should be noted that tin wire without additives cannot be directly used for welding electronic components, because it has no wettability and expansion. Welding produces spatter and the solder joints are not well formed.
Today, solder paste, tin bars and tin wires have been widely used in SMT, communication equipment, computers and other electronic equipment, whether it is spot soldering, wave soldering, reflow soldering or printing, ranging from major brands of electronic equipment factories to small We can all see them in mobile phone repair shops. They are the most widely used welding consumables on the market today. It is believed that in the future development, solder paste, solder bars and solder wires will also be used in the soldering operations of more electronic devices.

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