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                      Brand:   Tengdi Machinery
                      Model Number: 
                      Max Pipe Diameter: 
                      Maximum Dhickness:
                      Lead Time: 
                      Est. Time(days) 60
                      Comprehensive scheme customization of equipment
                      1 Year warranty

                      Are you looking for high-quality steel pipe mill that will provide exceptional performance? 

                      Tengdi Machinery is an excellent steel pipe making machine manufacturer with whom to explore collaborating. Tengdi provide a large selection of various steel pipe making machine choices that are intended to meet your unique requirements. We can be sure that you will get the finest steel pipe making line option for your needs. Tengdi collaborate with skilled specialists who contribute their years of experience and guarantee that all of our works meet the highest standards.


                      The straight seam welded pipe unit sends the strip steel into the welded pipe unit, and after being rolled by multiple rollers, the strip steel is gradually rolled up to form a circular tube billet with an opening gap. Adjust the reduction of the extrusion roller to control the weld seam gap at 1~3mm, and make both ends of the welding port flush. If the gap is too large, the proximity effect will be reduced, the heat of the eddy current will be insufficient, and the intergranular bonding of the weld will be poor, resulting in lack of fusion or cracking. If the gap is too small, the proximity effect will increase, and the welding heat will be too large, causing the weld to burn; or the weld will form deep pits after extrusion and rolling, which will affect the surface quality of the weld.

                      The welding temperature is mainly affected by the high-frequency eddy current thermal power. According to the formula (2), the high-frequency eddy current thermal power is mainly affected by the current frequency, and the eddy current thermal power is proportional to the square of the current excitation frequency; The influence of voltage, current and capacitance and inductance.

                      The formula for excitation frequency is: f=1/[2π(CL)1/2]...(1) where: f-excitation frequency (Hz); C-capacitance (F) in the excitation circuit, capacitance=electricity/ Voltage; L-inductance in the excitation circuit, inductance = magnetic flux / current

                      It can be seen from the formula above that the excitation frequency is inversely proportional to the square root of the capacitance and inductance in the excitation circuit, or proportional to the square root of the voltage and current. As long as the capacitance, inductance or voltage and current in the circuit are changed, the excitation frequency can be changed. Size, so as to achieve the purpose of controlling the welding temperature. For low carbon steel, the welding temperature is controlled at 1250~1460°C, which can meet the penetration requirements of the pipe wall thickness of 3~5mm. In addition, the welding temperature can also be achieved by adjusting the welding speed.

                      When the input heat is insufficient, the heated weld edge cannot reach the welding temperature, and the metal structure remains solid, forming incomplete fusion or incomplete penetration; when the input heat of the straight seam welded pipe unit is insufficient, the heated weld edge exceeds Welding temperature, resulting in overheating or molten droplets, so that the weld forms a molten hole.

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                      Q: Are you manufacturer?

                      A: Yes. We are manufacturer. We have our own technical team. Welcome to visit us.

                      Q: What payment terms do you accept?

                      A: We are flexible on payment terms, please contact us for details!

                      Q: What info you need before you make the proposal?

                      A: The pipe diameter and thickness range which you need or the profile drawings material information, your special requirements and speed of the machine.

                      Q: How do you do QA?

                      A: We have special team do strict QA, this is our strengths:  

                      (1)Every gear box will be tested for 8 hours with oil inside to guarantee there is no leak.

                      (2)Every shaft will be inspected for the centering jumpiness.

                      (3)Every roller will be checked to make sure it is in the range of tolerance critical parts will be inspected for all dimensions.


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                      Shijiazhuang Tengdi Machinery Co., LTD.,

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                      Iris Zhang
                      ? WhatsApp: +86-13831146634
                      ? E-mail: iris@tengdimc.com
                      Bonnie Zhang
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                      ? WhatsApp: +86 17733291540
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                      ?  Add : No.298 of Zhonghua North Street, Shijiazhuang City, Hebei P.R. China
                      ?  Tel: +86-311-68032581
                       Fax: +86-311-68003887
                      ?  Skype: iriszhang888
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