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Manufacturing process of ERW steel pipes and tubes

 Manufacturing process of ERW steel pipes and tubes

1.uncoiling

2.flattening

3.shearing and butt welding

4.loop storing

5.plate UT

6.trimming

7.forming

8.high frequency welding

9.removal burrs

10.on line ultrasonic tesing

11.annealed by medium frequency

12.air cooling

13.water cooling

14.sizing

15.straightness

16.cutting off

17.dimension & initial surface inspection

18.pipe ends plaining

19.hydrostatic test

20.ultrasonic testing of entire tube

21.off line ultrasonic testing

22.ultrasonic testing for pipe ends

23.dimension & final surface inspection

24.warehousing