Forming method: Hydraulic forming
9 types of joints : 1, both ends are external joints WW type
2, both ends are internal joints NN type
3, one end is external joints , the other with bottom WDtype
4, both ends are side cut from the trough QdQd type
| effective area cm2 | OD(MM) | ID(MM) | pitch(mm) thickness | waves | thickness(mm) |
| 11.34 | 45 | 31 | 3.6 | 12 | 0.12-0.14 |
| 14.73 | 51 | 35.6 | 3.6 | 16 | 0.12-0.14 |
| 16.62 | 55 | 37 | 4.2 | 12 | 0.14-0.16 |
| 20.03 | 60 | 41 | 4.5 | 15 | 0.14-0.18 |
| 35.26 | 79 | 55 | 5.4 | 13 | 0.16- 0.18 |
| 60.13 | 100 | 75 | 6 | 9 | 0.16-0.20 |
