LRF

Lack of Root Fusion 

LRFLack of Root Fusion is a welding defect, where the weld material does not fuse with the parent material at the root of the weld joint. LRF on one side of a weld joint is also referred to as incomplete root fusion. LRF on both sides of a weld joint is also referred to as incomplete root penetration.

For more information on LRF see:
https://www.twi-global.com/technical-knowledge/job-knowledge/weld-defects-imperfections-incomplete-root-fusion-or-penetration-040

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