As the backbone of process industries such as petroleum, chemical, pharmaceutical, and environmental protection, the manufacturing quality of metal towers directly affects the safety, stability, and efficiency of the entire production facility. Every towering tower is forged from steel plates through a series of interlocking and precise processes.

2024Dier Chemical Packing Co., Ltd., Pingxiang City, Jiangxi ProvinceThe company has successfully achieved national recognitionThe A2 level pressure vessel manufacturing license signifies that the company's compliance, technical strength, and management level in the field of special equipment production have been recognized by national departments. BelowLet usGo deep into the Dilta manufacturing workshop and gain a panoramic understanding of the birth journey of this' industrial backbone '.

Phase 1: Precision cutting and forming - shaping the "skeleton" of the tower

The starting point of production is raw materials. Deere Company strictly follows the design drawings and process requirements to pre treat and accurately shape the high-quality steel plates entering the factory.

1Intelligent cutting and groove processingDeere uses high-precision CNC cutting equipment for cutting. For conventional carbon steel, a laser cutting machine can be used, with a cutting speed of up to50m/min， The accuracy is controlled within ± 0.05mm, and it can achieve "one cut forming" of V-shaped grooves, greatly improving efficiency and groove quality. For special materials such as stainless steel, plasma cutting and other processes are used. The shape of the groove is the key to determining the quality of subsequent welding, and its machining accuracy requirements. Taking the segmented head as an example, Deere draws on cutting-edge laser vision measurement technology to achieve automatic layered cutting of grooves by measuring the depth of the curved surface in real time. The cutting error is controlled within the millimeter level, ensuring the accuracy and consistency of complex curved surface grooves.

2、Roll forming and head manufacturingThe cut steel plate is cold rolled or hot rolled by a large plate rolling machine to form a cylindrical "tube section". This is the core step in controlling the roundness of the tower foundation, and the operational accuracy directly affects the difficulty of subsequent pairing. The head is formed through mold stamping or spinning process to ensure that its curved shape meets the design standards.

Phase 2: Millimeter level assembly and welding - constructing the "torso" of the tower

This is the core stage of connecting individual components into a whole, and Deere has invested high-precision in this processequipmentAnd strict process discipline.

1Longitudinal seam welding and roundingThe longitudinal weld seam of a single cylinder section is first spot welded and assembled, and then welded on the welding roller frame. After welding, the cylinder section may deform, and it is necessary to use a plate rolling machine or specialized rounding equipment for precise rounding to ensure that its roundness meets the requirements of the next process.

2Circular seam pairing: a battlefield for precision victoryMultiple cylinder sections and heads are docked section by section on a large assembly fixture. This stage is of utmost importance in quality control, and Deere strictly follows the precision standards of manufacturing fields such as nuclear industry for control:

（1）Misalignment: Control within thinner and thicker sheetsWithin 1/10 and usually not greater than 3 millimeters.

（2）straightness/CoaxialityMonitor the verticality and centerline deviation of the entire tower within a very small range through instruments such as laser ranging.

（3）Group gap: Use gap plates and other tools to precisely control the gap between the ring seams within the required range of the process.

The strict control of these parameters is the foundation for ensuring the quality of subsequent circumferential welding and the overall load-bearing capacity of the tower.

3Circumferential welding: the longest lifelineThe circumferential seam is the "waistband" that connects the various sections of the tower, and it is also the longest and most complex weld seam on the tower. Dier uses a welding roller frame to drive the tower body to rotate, and the internal and external welders perform welding synchronously. For important welds, processes such as "single-sided welding double-sided forming" are used, and principles such as "welding the circumferential seam first, then welding the vertical seam" are followed to control welding stress and deformation. The welding method is selected based on material and process evaluation, including manual arc welding, submerged arc automatic welding, argon arc welding, etc.

4、Attachment weldingAfter completing the main body welding, accurately weld the skirt, connecting pipe, flange, manhole, platform and other accessories. Among them, the flatness and levelness requirements of the flange surface often require secondary machining or calibration after welding to ensure the tightness of the connection with the external pipeline.

Phase Three: Full Dimensional Non Destructive Testing - Performing "Whole Body CT" for Tower Equipment

After welding is completed and the appearance inspection of the weld seam is qualified, it enters the non-destructive testing stage. According to design standards and regulatory requirements, Deere adoptsThe technology conducts a 'physical examination' of the weld seam to ensure that there are no internal defects.

Stage 4: Stress Relief and Testing - Empowering the Tower with a "Resilient Soul"

1、Post Weld Heat TreatmentFor thick walled towers, materials with a tendency towards stress corrosion, or situations where standards require it, Deere will perform post weld stress relief heat treatment. Send the tower as a whole into a large heat treatment furnace for slow heating, insulation, and cooling to eliminate welding residual stress, improve material mechanical properties, and enhance the long-term safety of the equipment in harsh environments.

2、Stress Test: The Final 'Coming of Age Ceremony'This is the most comprehensive strength and tightness test of the tower before leaving the factory. Deere strictly follows the "Safety Technical Supervision Regulations for Fixed Pressure Vessels".

（1）Hydrostatic test: method. Slowly increase the pressure to the design pressure after filling with water1.25-1.5 times, maintain pressure for sufficient time, check for leakage, abnormal deformation, and pressure drop. There are strict requirements for the water quality used in experiments, and austenitic stainless steel equipment needs to control the chloride ion content in the water to prevent stress corrosion.

（2）Air pressure test: For equipment that is not suitable for water filling due to structural or foundation reasons, or that is not suitable for water sensitive environments, an air pressure test is conducted under strict safety measures. The test pressure is usually the design pressure1.1-1.15 times.
The successful completion of the pressure test is the ultimate proof of the qualified manufacturing quality of the tower, and it is also the result of Deere CompanyThe concentrated manifestation of A2 level manufacturing qualification strength.

summarySystem engineering, crafted with ingenuity

The production of metal towers is far from simple metal processing. It is a complex system engineering that integrates materials science, welding engineering, non-destructive testing technology, and strict quality management. From cutting a steel plate to erecting a giant tower, every step embodies Deere's commitment to "craftsmanship" and "compliance". The A2 level pressure vessel manufacturing license owned by the company is not only a qualification, but also a responsibility and commitment that runs through every process and inspection mentioned above.

We believe that through this in-depth journey of the manufacturing process, you will not only understand how the tower is manufactured, but also gain a better understandingDier Chemical Packing Co., Ltd., Pingxiang City, Jiangxi ProvinceProfessional expertise and value pursuit as a reliable partner in the industry. Welcome to visit the Dier production base in Pingxiang and experience the power and precision of modern industrial manufacturing firsthand.