QPE Blog: Solder paste printing: the foundation of reliable PCB assembly
Before components are placed on a PCB, solder paste must be applied accurately. The amount of paste deposited and its position on the board both influence the quality of the solder joints formed later in production.
At QPE, we use our DEK Horizon solder paste printer for this first stage of the surface-mount assembly process, helping us achieve consistent, repeatable printing before boards move on to component placement.
Why accuracy matters
Solder paste printing involves aligning a stencil with the PCB and depositing paste through its apertures onto the board’s solder pads. During reflow, the solder melts to form the connections between the components and the PCB.
Getting the print right helps reduce the risk of problems later in the process:
Too much paste can contribute to solder bridging, creating unwanted connections between adjacent pads or component leads.
Too little paste can result in insufficient solder joints, potentially affecting their strength and reliability.
Misalignment can leave paste incorrectly positioned, increasing the risk of assembly defects.
These issues can lead to rework and affect production yields. Controlling the printing process helps prevent defects at their source.
The role of our DEK Horizon printer
Our DEK Horizon printer aligns the stencil with the PCB and applies controlled deposits of solder paste where they are needed.
Repeatability is particularly important across a production run. Each board needs a consistent print to support the component placement and reflow stages that follow.
The printer plays an important role, alongside the stencil design, solder paste and process settings. Together, these factors help establish a controlled printing process suited to the assembly being manufactured.
What this means for customers
Accurate solder paste printing supports consistent solder joint formation and reduces the risk of printing-related defects further down the production line.
For customers, this contributes to improved production yields, less avoidable rework and reliable finished assemblies.
At QPE, this is part of our approach to building quality into each stage of manufacture. Final inspection matters, but so does controlling the processes that determine the quality of the assembly from the outset.
Planning a new PCB assembly project? Contact QPE to discuss your manufacturing requirements.
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