| 1 | This paper introduces a simple method of curving angle steel arc. | |
| 2 | It's ideal equipment for bend angle iron flange. | |
| 3 | Main material for installing: all kinds of channel steel , angle iron and plate iron. | |
| 4 | In suitable, thick type and the welding of building steel plate and angle iron etc... | |
| 5 | Therefore, two channels were placed underneath the switchboard to facilitate the sliding motion. |