Thermal Relief Design for Through-Hole Pads A thermal relief is a pad that is connected to a plane by a small number of narrow spokes rather than by a full connection. It exists so that a through hole joint can be soldered without the plane drawing the heat away, and…

Solder Beading on Chip Components After Reflow A solder bead is a small sphere of alloy that has formed beside a chip component, usually attached to the termination or to the mask. It is a defect because it can move during later handling, because it can bridge to a neighbouring…

PCB Placement Nozzle Control: Holding It Steady Placement nozzles pick small parts and set them on pads at speed. A nozzle that drifts, clogs or wears changes the result without stopping the line. Control means knowing which nozzle ran, how it was checked and what the machine actually placed. This…

PCB Placement Nozzle Environment: A Factory-Floor Review Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article explains PCB…

Solderability and Storage Conditions A board that soldered perfectly last month may not solder today, and nothing about the process has changed. What changed was the surface. Solderability decays with time and with the conditions the board has been stored in, and the decay is invisible until the first defect…

Reflow Zones: Reflow Zone Tuning for Consistent Joints A reflow oven is a series of temperature controlled zones and a belt, and the profile a board experiences is the result of all of them together. Tuning the zones is how a specification on paper becomes a repeatable result on the…

Solder Paste Slump Causes and Control Slump is the change in shape of a paste deposit between printing and reflow, and it is measured as the spread of the deposit beyond the aperture footprint. A paste that slumps bridges two pads before the alloy ever melts, and the defect appears…

PCB Placement Nozzle Traceability: Design, Process, and Quality Notes Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB placement nozzle traceability from the perspective of a PCBA factory…

PCB Placement Nozzle Improvement: Design, Process, and Quality Notes Modern electronics depend on boards that are assembled correctly the first time. Every product – a phone, a charger, a medical instrument or an industrial controller – relies on thousands of solder joints that must conduct current for years. This article…

Chip Tombstoning and Paste Print Balance Tombstoning is the failure where a two terminal chip component stands on one end after reflow instead of lying flat. It is a visible defect, easily detected, and it is caused by an imbalance in the forces acting on the two terminations during melting.…