Tips on Solder Paste Application to a PCB

Posted by Alphaassembly on January 27th, 2017

Solder paste is a crucial aspect of a PCB assembly, especially when reflow soldering techniques are used. It is typically a mixture of specially formulated flux and solder spheres. Hence, the solder creates a type of paste that can be integrated onto the surface of a PCB without causing problems with how the board should function. There are different types of solder pastes for different applications, but the best one for PCB assembly is something that can be printed onto the surface of the product in the place where it is needed. To use solder paste properly, you need to follow certain steps for accurate application. Here are tips on using solder paste on a PCB:

•    Apply paste only on the required areas– Make sure that the solder paste is applied only to areas where the solder is needed. To ensure proper application, use a solder paste stencil.
 
•    Apply the components right after the paste has been applied to the PCB – Once the solder paste is on the board, start adding the components. The surface tension of the paste will keep the components in place.,

•    Make sure the board is stable – Use tools and accessories like clamps to hold the board in place. Otherwise, the components may fall off or become out of place. The board must be soldered within a few hours of placement to prevent the solder paste from deteriorating.

•    Make sure the solder paste is not expired – Reputable manufacturers indicate the ‘use by’ date on the packaging of their solder pastes. Be sure that the paste is still in good condition and has not passed its expiration date. Old solder will make your PCB defective.

•    Store the solder paste properly– Proper storage is essential to ensure that the solder paste will provide the highest performance for any PCB assembly. Store it in an airtight container to avoid oxidation. Solder spheres have a large surface area, so they are very prone to oxidation. Moreover, make sure that the paste is stored in low temperatures to reduce the rate of oxidation and the rate of the flux’s degradation. Just make sure the temperature is not below freezing.

About the Author:

Alpha Assembly Solutions Inc. is a premier company engaged in the development and manufacture of high quality electronics assembly materials. Since the year of its inception, way back in 1872, the company has played its role on the frontline of innovation, bringing many first-to-market products to the fore thereby, creating a premier niche for itself in the market.