Main beam for wind turbine blade and manufacturing method thereof

A main beam for wind turbine blade, comprising:

• one or more carbon fiber pultruded bodies, each of the one or more carbon fiber pultruded bodies comprising one or more carbon fiber pultruded sheets, the one or more carbon fiber pultruded sheets are stacked along a thickness direction of the one or more carbon fiber pultruded bodies, wherein the one or more carbon fiber pultruded sheets are formed by curing a first infusion material;
• one or more inlays, which are arranged adjacent to the one or more carbon fiber pultruded bodies in a direction perpendicular to a thickness direction of the main beam;
• one or more overlays, which cover the one or more carbon fiber pultruded bodies and/or the one or more inlays on both sides in the thickness direction of the main beam;
• and
• a second infusion material, which impregnates the one or more carbon fiber pultruded bodies, the one or more inlays and the one or more overlays,
• wherein the one or more carbon fiber pultruded sheets comprise a plurality of carbon fiber pultruded sheets, and a glass fiber infusion material is provided between at least two of the plurality of carbon fiber pultruded sheets,
• wherein the glass fiber infusion material and the second infusion material are the same material.