No.

Chinese Step Name

English Translation

Notes/Explanation

1

超声波板探

Ultrasonic Plate Testing

Performing non-destructive testing on the raw steel plate.

2

铣边

Edge Milling

Milling the edges of the steel plate to prepare for welding.

3

预弯

Pre-bending

Pre-bending the edges of the steel plate to facilitate subsequent pipe forming.

4

成型

Forming or Shape Bending

Spirally rolling the steel plate into a cylindrical shape.

5

预焊

Tack Welding

Performing initial tack welding to secure the cylindrical form.

6

内焊

Internal Welding

Welding the main seam from the inside of the pipe.

7

外焊

External Welding

Welding the main seam from the outside of the pipe.

8

1#超声波连探

No.1 Ultrasonic Testing (UT)

Conducting the first continuous ultrasonic non-destructive testing on the main weld.

9

1#X光电视检验

No.1 X-ray Inspection (Real-time)

Performing the first real-time internal quality inspection using X-ray imaging.

10

机械扩径

Mechanical Expanding or Sizing

Expanding the steel pipe to the standard diameter and relieving stress.

11

平头

End Facing or Chamfering

Trimming both ends of the steel pipe flat and machining bevels.

12

水压试验

Hydrostatic Test

Conducting a pressure test on the steel pipe to verify its pressure-bearing capacity and sealing performance.

13

倒棱

Beveling

Machining bevels at the pipe ends to prepare for on-site connections.

14

2#超声波连探

No.2 Ultrasonic Testing (UT)

Conducting the second (usually final) ultrasonic non-destructive testing.

15

2#X光拍片检验

No.2 X-ray Inspection (Film)

Performing the second (usually final) X-ray inspection, potentially using radiographic methods.

16

成品检验

Final Inspection

Conducting final inspections on the steel pipe’s dimensions, appearance, and other criteria.