The repair welding method comprises the following steps: firstly, preparing a protectant for repair welding and deposited metals according to material compositions of a large forged piece;

本发明的补焊方法，包括以下步骤：首先根据大型锻件的材质成分，制备补焊用保护剂和熔敷金属；

In a 100-year-old workshop in the centre of Berlin stands a gleaming piece of forged metal, four storeys high.

在柏林市中心一间有着百年历史的车间里，矗立着一件泛着光泽的金属锻件，足有四层楼高。