The raw materials of spiral steel pipe are strip steel coil, welding wire and flux.Before production, it must pass strict physical and chemical inspection.
2. Single wire or double wire submerged arc welding shall be adopted for butt joint of strip head and tail, and automatic submerged arc welding shall be adopted for repair welding after rolled into steel tubes.
3. Before the model, the strip is treated with leveling, trimming, planing, surface cleaning, conveying and edge bending.
4, weld gap control device to ensure that the weld gap to meet the requirements of welding, pipe diameter, the amount of wrong side and weld gap are strictly controlled.
5, after a single steel pipe, each batch of the first three steel pipe to carry out a strict first inspection system, check the mechanical properties of the weld, chemical composition, the state of fusion, the surface quality of steel pipe and through non-destructive inspection inspection, to ensure that the pipe process qualified before the formal production.
6. For the parts marked by continuous acoustic wave inspection, manual ultrasonic wave and X-ray examination shall be conducted. If there are defects, they shall be repaired and then undergo non-destructive examination again until they are confirmed to be eliminated.
7, mechanical processing, so that the end of the vertical, bevel and blunt edge to be accurately controlled.
Q : Are you trading agency or manufacturer?
A: We are producer of duckbill check valve, expansion joint,rubber joint, bellow, dismantling joint, flange and pipe fitting.
Q: Do you've got merchandise catalog?
A: Yes, we have. Please tell me your email or immediately messager, we are able to send our catalog.
Q: Can you offer drawings and technical data?
A: Yes, our expert technical branch will layout and offer drawings and techical data.
Q: Do you offer samples? Is it loose or charged?
A: Yes, we can offer sample free but shipping costs covered by customer.
Q: Can the products be manufactuered via customer's requirement?
A: Yes, the specifications stated above are the standard ones, we are able to layout and manufacture as requirement.