Solder Paste Flux Activation In Reflow Solder paste is a mixture of metal powder, flux and a solvent, and the flux is there to remove the oxide that covers both the powder and the surfaces being joined. The chemicals that do that work are the activators, and they only function…

PCB Supplier Qualification Guide Supplier qualification is the work of establishing, before the first production order, that a supplier can make what is required, repeatedly, and that there is a written basis for expecting it to continue. It is often treated as a purchasing formality, and it is more accurately…

PCB Selective Solder Setup: From Prototype to Volume Production Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB selective solder setup gives you a practical advantage…

PCB Selective Solder Limits: From Prototype to Volume Production 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…

PCB Selective Solder Maintenance: From Prototype to Volume Production 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 selective solder maintenance from the perspective of a PCBA factory…

Nozzle Crash and Placement Head Damage Prevention on SMT A nozzle crash is the moment when the placement head drives a nozzle into something that should not be there, and it is usually the most expensive event of the week. The nozzle bends or breaks, the head may be knocked…

PCB Incoming Inspection: Verifying Materials Incoming inspection is the last point at which a defect can be stopped before it enters the production flow, and the first point at which supplier quality becomes visible as a number. The temptation is to inspect everything, which is impossible, or to inspect nothing,…

PCB Selective Solder Standards: Practical Process Controls 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 selective solder standards from the perspective of a PCBA factory floor, covering…

PCB Selective Solder Defects: Practical Process Controls 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…

Annular Ring Calculation and Breakout Limits in PCB Design The annular ring is the ring of copper that surrounds a drilled hole on a printed circuit board. It is what connects the barrel of the hole to the trace and what holds the pad together, and its width is the…