Metal fabricating and welding glossary - L

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Lap weld

Coil ends are “lapped” over one another and welded, doubling the thickness of the steel at the weld and are then marked by a hole punch.

Lap-welded joint

Welded seam in which the two metal pieces to be joined overlap one another.

Load up

Accumulation and compaction of metal particles between the abrasive grit of a grinding belt disc or wheel rendering it ineffective.

Lock seam tube

A hollow (closed) roll form shape mechanically fastened using the roll form tooling.

Locking bead

A bead or projection designed to prevent metal flow in a forming operation.

Loose wrap

A coil that is not wound tight. Winding using too little tension causes this condition.

Lubricant

Any substance interposed between two surfaces in relative motion for the purpose of reducing the friction and/or wear between them.

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