What is the difference between lead-free and lead based processes in PCBA processing?
Release time：2025-12-19
Click count： 582
What is the difference between lead-free and lead based processes in PCBA processing? Customers often ask what the difference is between lead and lead-free PCBA processing, and whether the widespread use of non heavy metal soldering materials means that all PCBA boards are free of heavy metals. In practice, not all SMT processing techniques use non heavy metal soldering materials. Due to cost considerations or other difficulties, many PCB manufacturers may resort to lead processing techniques again. So how do you know if the spot welding of PCBA boards sold in the market is free of heavy metals or heavy metals? This issue can be divided into three levels of dividends. Content from: www.yidasmt.com Welding Surface Appearance: On the circuit board, the surface of the lead welding material is bright milky white, while the non heavy metal welding material is light yellow (due to the presence of copper in the non heavy metal welding material). The general term for Printed Circuit Board Assembly (PCBA) in English, which refers to the PCB blank board that has undergone SMT surface mount or DIP software manufacturing, is commonly known as PCBA. It is a common writing style in China and is referred to as the official internet slang. Assuming that the welding material is rubbed vigorously, the non heavy metal welding material will leave a light yellow mark in the hand, while the lead welding material will leave a gray black mark.
Solder material composition: Lead welding materials are the two main components of tin and lead, while non heavy metal welding materials have a composition of less than 500PPM. Non heavy metal welding materials generally contain tin, silver, or copper elements. Main use: Lead products are welded with lead welding materials, and commonly used special tools and components are lead. The special tools and components used for exporting heavy metal free welding materials to foreign countries must be free of heavy metals. By integrating these three aspects, we can clearly distinguish PCB boards that use metal free soldering methods from many PCBA boards. PCBA processing SMT and DIP processing are methods of integrating parts on PCB boards. The key difference is that SMT does not require drilling holes on the PCB, while DIP requires inserting the PIN pins of the parts into the already drilled holes.
Home