Construct · 1 fields · 1 citations

tombstoning: a standalone construct

One name. One construct. A landmark on the map.

● anchor · a standalone construct Nearest construct by meaning·not indexed
tombstoning1 CONSTRUCTTombstoningREFLOW · STANDS UP

A single standalone construct; nearby constructs are located against it in the Collider. Tap a field for its definition, unit, and measures.

Electronics assembly

A chip part stands upright during reflow

In electronics assembly, tombstoning (also drawbridging or the Manhattan effect) is a reflow-soldering defect in which a small two-terminal chip component lifts off one pad and stands on end like a grave marker, because the solder on its two ends melts and pulls at different times, so the surface-tension force on the first-wetting end overpowers the other and rotates the part upright. Lee's Reflow soldering processes and troubleshooting traces it to unbalanced wetting forces from asymmetric heating, pad design, or paste, and lays out the fixes. The referent is a physical misalignment failure of a soldered joint, counted as a defect rate, and it has nothing to do with a financial notice beyond both being named for the shape of a headstone.[1]

Unit
The incidence of components lifted to a vertical, one-terminal-open position
Recovery means
Not applicable
Measured by
Counted as a defect rate by inspection and traced to heating balance, pad geometry, and paste through designed trials

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Nearby constructs

assembly1 fields · 1 citationsanchor · a standalone constructbeing3 fields · 3 citationsjingle · one word, three constructs

References

  1. Lee, N.-C. (2002). Reflow soldering processes and troubleshooting: SMT, BGA, CSP and flip chip technologies. Newnes. ISBN 9780750672184

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