Every electronic product begins with a bare printed circuit board, but that board becomes valuable only after components are placed, soldered, inspected, and tested. assembling circuit boards is the stage where electrical schematics become tangible hardware. It is not simply a matter of dropping parts onto a substrate. It is a controlled sequence of metallurgical, thermal, and mechanical steps that determine whether a device works reliably for years or fails in the field. Modern boards push assembly far beyond traditional through-hole and surface-mount work. Engineers now specify HDI boards with laser-drilled microvias, high-frequency RF materials, rigid-flex constructions, heavy copper, metal cores, and packages such as 0.4 mm pitch BGAs and…