What is the meaning of Puddling?

The action of forming a puddle.

The process of working clay, loam, pulverized ore, etc., with water, to render it compact, or impervious to liquids.

The act of lining a canal with puddle to make it watertight.

The first true industrial process to produce steel from pig iron.

A group of mallards (ducks).

A behaviour in which animals like butterflies seek out moist substances to obtain nutrients.

present participle and gerund of puddle

Source: wiktionary.org