base metal fusion zone的意思|示意

The joint which is connected by welding method is called the welding joint, which is composed of welding seam, fusion zone, heat affected zone and its adjacent base metal.

用焊接方法连接的接头称为焊接接头，它由焊缝、熔合区、热影响区及其邻近的母材组成。

Compared with base metal, the microstructure in fusion zone is finer, and the hardness is higher. The hardness difference exists at various places in fusion zone.

与母材相比，焊缝区组织细小，硬度较高，焊缝区不同部位的硬度存在一定差异。