Thread inlay

Japanese: 糸象嵌 - いとぞうがん

...The technique of inlaying other materials (sometimes of the same type) onto the surface of materials such as metal, ceramics, or wood. In the case of metal inlay, the base metal surface of copper or iron is often carved and gold, silver, or copper is inlaid into it. There are various types of inlay, such as thread inlay, flat inlay, cloth inlay, high-pitched inlay, and cut inlay. (1) Thread inlay Also called wire inlay, this technique involves carving patterns or letter shapes into the metal surface with a chisel, and then inlaying thin metal threads to make the surface flat.

From [Engraving]

… Inlay is a technique in which the surface of a metal is engraved and other metals are inlaid to create patterns or inscriptions. Thread inlay is a technique in which thin lines are inlaid to create patterns or letters, and is also called line inlay. Flat inlay is a technique in which metal is inlaid flatly to create a smooth surface. …

*Some of the terminology that refers to "thread inlay" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…金属，陶磁，木材などの材料の表面に，他の材料(同種のこともある)を嵌（は）め込む技術をいう。　金属象嵌の場合，素地となる銅，鉄などの金属面を彫って金，銀，赤銅（しやくどう）などを嵌め込むことが多く，糸（いと）象嵌，平（ひら）象嵌，布目（ぬのめ）象嵌，高肉（たかにく）象嵌，切嵌（きりばめ）象嵌などがある。(1)糸象嵌　針金象嵌ともいい，金属表面に鏨（たがね）で文様や文字の形を彫り，そのあとに糸状の細い金属を嵌め込み表面を平らにする。…