1原材料 material

2 平板 flat material

3剪板 cutting

4折弯 bending

5割法兰， cutting flange

6收口 welding

7 组装 assemble

8 手工焊 welding by hand

9 打磨polish

10 整形 reshaping

11镀锌 galvanization

12 检测镀锌厚度， testing zinc thickness

13拉力测试testing for yield strength

14包装  package

15装箱 delivery