How to effectively prevent defects in solder paste?

In the production process of SMT surface mount processing, there will be many different processing defects. Different environments and operating methods can lead to different processing defects. SMT surface mount is also precision processing, and some problems are normal. What needs to be done is to control the quality during processing.

Solve all these possible problems, and solder paste defects are quite common in SMT processing. Solder paste defects involve various processing steps, such as BOM and Gerber, component procurement, storage and retrieval control, solder paste printing, SPI solder paste testing, reflow soldering, etc. Below, Suzhou Nofel solder paste manufacturer will briefly introduce how to prevent the occurrence of solder paste defects:

In the SMT surface mount processing, it is necessary to strictly comply with the requirements of the ISO9001 quality management system.

1、 In large-scale SMT surface mount processing, the processing cycle is usually relatively long. At this time, there may be factors such as dry solder paste, template openings, and misaligned circuit boards on the steel mesh that can easily lead to poor soldering, which need to be dealt with in a timely manner.

2、 Fix the printing cycle in a specific mode during the solder paste printing process. Ensure that the template is located on the solder pad to ensure cleanliness during the solder paste printing process. For micro templates, if damage occurs between the thin pins due to the bending of the template cross-section, it may lead to printing defects and short circuits.

3、 After printing solder paste in SMT packaging materials, the improperly printed board should be immediately immersed in a solvent because the solder paste is easy to remove before drying.

4、 To prevent solder paste and other contaminants from remaining on the surface of the circuit board, a clean cloth can be used for wiping. After soaking, scrub with mild spray and dry with hot air blower. If using a horizontal template cleaner, the cleaning side should be facing downwards to prevent the solder paste from falling off the template.

Nofel solder paste manufacturers produce various tin solder products, including lead-free solder paste, halogen-free solder paste, silver containing lead solder paste, syringe solder paste, nickel plated environmentally friendly tin wire, tin bar, etc. We can provide technical support. If you have any soldering needs or technical problems, you can consult our technical team and develop free solutions!