🚨 What is Lack of Fusion (LOF) in Welding & How to Prevent It? Lack of Fusion (LOF) – also called Incomplete Fusion – is one of the most critical welding defects. It occurs when the weld metal fails to fuse properly with the base metal or previous weld bead, leaving an unbonded gap. 🔍 Why is it dangerous? LOF acts like a sharp crack in the weld, drastically reducing strength and making the joint prone to failure under stress. 🔷️It can happen at: ✔ Sidewall – arc misses the joint edges ✔ Inter
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