IEC 60068-2-83: Environmental Testing — Solderability Testing

Solderability Testing: The First Line of Defense Against Dry Joints

IEC 60068-2-83:2011 specifies solderability testing for electronic component leads — using the Wetting Balance method to quantitatively measure how well a component termination is wetted by molten solder. This is the first line of defense in electronics assembly quality control.

Test principle: Immerse the component lead into molten solder (typically 235 °C, Sn96.5Ag3.0Cu0.5) at a controlled speed, measuring wetting force over time. Key criterion: time to 90% of maximum wetting force must be under 2 seconds. Longer than 2 seconds indicates severe lead surface oxidation, making dry joints highly probable during soldering.

Lead-free challenge: SnPb eutectic solder inherently wets better than SAC lead-free alloys. RoHS compliance makes solderability testing more critical than in the leaded-solder era — lead-free process windows are narrower, demanding higher component solderability.

TN Lab — The reliability of one solder joint determines the fate of an entire circuit board.