To help the corrosive action

Cleaning before soldering the joint

To break down the acid within the joint

Remove residual flux and prevent corrosion

Poor wetting

Pits and voids

Dry solder joint

Dull grainy surface

Apply flux

Clean normally

Use abrasive method

Use Isopropyl Alcohol

To melt the solder quickly

To help the joint to be soldered

To prevent clogging of the nozzle

To remove the flux collected in chamber