How to Say "welt" in Spanish
The Spanish word for “welt” is “filete” — B2 level.
English → SpanishB2
nounB2
a strip of leather in shoemaking

Examples
La portada del libro tiene un filete de oro.
The book cover has a gold border.
El sofá tiene un filete blanco que resalta el color azul.
The sofa has white piping that highlights the blue color.
Abstract use
Think of this meaning as a 'thin strip' of something, which helps connect it to the food meaning (a thin strip of meat).
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