Common causes and solutions for the formation of tin beads

During the production and processing in Shenzhen's surface mount technology (SMT) processing factories, sometimes due to various reasons, some poor production and processing phenomena occur, and solder beads are one of the more common ones, mainly manifested in the completionSMTAfter surface mount processing, small spherical or point-like solder may appear on the solder pads or other places. If not dealt with in a timely manner as required by production, it may affect the service life and reliability of the board. Now, Shenzhen JJYSolder paste manufacturerHere is a brief introduction to the common causes and solutions for the formation of tin beads:

I. Causes of Formation

1Induction cladding

During the welding heating process, solder balls may form inPCBThe main reasons for this are the instability of the molten pool and the temperature inconsistency of the circuit board. When the induction heating in the circuit board is too high, it will cause the melting point of the solder pads or the metal layer on the back to decrease, thereby leading to the formation of solder beads.

2Get involved

During the production and processing,PCBWhen deformation or misalignment occurs, it may cause the solder to enter the wrong position.

3Welding repair

The circuit board isSMTWelding rework is often required during the processing. If the repair is not done properly, it will cause solder beads to appear on the solder pads.

Ii. Solutions

1Mechanical treatment

This is the most commonly used processing method in surface mount technology (SMT) processing plants, usually involving the use of solder absorbers and solder silver wires for processing.

2Optical examination and infrared microscope examination.

For problems that cannot be solved by mechanical processing, optical inspection or infrared microscopy can usually be used to check the position and shape of the solder balls.

3Strengthen control and inspection

Strengthening control and inspection is preventionSMTThe best method for forming solder balls in production.

Shenzhen JJY Industrial Technology Co., Ltd. mainly engages in the production and operation of:SMTSolder paste manufacturers of solder paste, syringe solder paste, lead-free solder wire, wave soldering bar, automatic soldering wire, etc.