Which sequence correctly represents the general solder procedure abbreviated by CCAACI?

• A. Check Fit, Clean, Apply Flux, Apply Heat And Filler Metal, Clean And Inspect
• B. Clean, Check Fit, Apply Flux, Clean And Inspect, Apply Heat And Filler Metal
• C. Check Fit, Apply Flux, Clean, Apply Heat And Filler Metal, Inspect
• D. Apply Heat And Filler Metal, Check Fit, Clean, Apply Flux, Inspect

Answer: (A)

The sequence tested follows the soldering workflow implied by the acronym CCAACI: Check Fit, Clean, Apply Flux, Apply Heat And Filler Metal, Clean And Inspect. Start by checking fit to confirm parts align and there are no gaps or misalignments that would weaken the joint. Then clean the surfaces to remove oils, oxides, and contaminants that would block wetting and heat transfer. With clean surfaces, apply flux to chemically cleanse further and prevent reoxidation during heating, which helps the solder flow smoothly into the joint. Next comes the actual soldering step: apply heat and the filler metal so the solder melts and flows into the joint by capillary action, creating a sound bond. Finally, clean any flux residue and inspect the finished joint to ensure proper fill, coverage, and absence of defects. This order mirrors the acronym and supports reliable, high-quality joints. Other sequences disrupt this logical flow, such as moving cleaning before or after the wrong steps or skipping the final inspection.