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Why are "carriers and fixtures" used in SMT welding?

1. Usage scenarios of carriers and fixtures

Carrier: It is mainly used to assist production during printing and placement. It is also needed if the board is broken due to unreasonable splicing.

scenes to be used

1. Thin PCB: When the PCB thickness is 0.4mm, 0.6mm, or 0.8mm, a carrier is needed to hold the PCB for printing and mounting. The fully automatic printer also needs a certain amount of support to keep it coplanar with the steel mesh and fit it. When mounting, the mounting machine needs the PCB to maintain parallel coplanarity to ensure mounting accuracy. Thin boards are also prone to bending and deformation during reflow soldering due to high temperature and fall off the track.

2. Double-sided patch: For double-sided patch, if there are heavy components on both sides or they are arranged densely, a carrier is required to ensure the production quality of each process.

3. SMD components extend out of the PCB board: If the SMD components extend out of the PCB board, the center of gravity of the components is not on the board surface or on the process edge, and the normal transportation of the track cannot be guaranteed. The components will be unstable and deviate and fall during the movement, and a carrier is still needed.

Why are "carriers and fixtures" used in SMT welding?

Fixture: Mainly used in wave soldering of plug-in. Used for auxiliary welding.

scenes to be used

1. Thin PCB: PCB thickness is 0.4mm, 0.6mm, and a carrier is needed to hold the PCB for wave soldering. The wave soldering track cannot position and tighten the thinner board and is easy to deform, resulting in poor soldering. Also, due to the influence of temperature, the board bends and falls into the tin furnace, resulting in scrapped products.

2. Double-sided welding: The welding side of the plug-in has a solder paste board that has been reflow soldered. In order to prevent the SMD components from falling into the tin furnace, a clamp is needed to protect the SMD components.

3. The plug-in extends out of the board. If there are inserted devices extending out of the PCB board, the center of gravity of the components is not on the board surface or on the process edge, and the normal transportation of the track cannot be guaranteed. In order to prevent the device from shifting or falling during wave soldering, a clamp protection is needed.

Why are "carriers and fixtures" used in SMT welding?