Company introduction: Hangzhou Debao Electromechanical Manufacturing Co,. Ltd was founded in 2003. It's a professional manufacturer in communication tower, electrical tower, galvanizing process and decorative antenna and so on. With 163.8 million RMB registered capital and 700 employees, Debao has become the largest hot-dip galvanizing production base around East China( total 780 tons production capacity). Also, it is the manufacturing base of Zhejiang University Chemistry Laboratory galvanizing products and enterprise credit AAA company with ISO certificate. We have 10000 square meter office building and 46000 square meter workshop equipped with high-level production lines for communication tower and hot-dip galvanizing, which constitute a strong guarantee for the company's high operation efficiency. Per market demand, Debao launched a series of landscaped tower, bionic tower, decorative antenna, portable mobile base station, which have been widely used by operators now.
Qualification: Business license, tax registration certificate and organization code certificate, quality management system, occupational health management system, environmental management system, enterprise credit AAA.
Construction Process: 1. Raw material inspection Check steel specification, grade and heat number when coming, and then send sample to the laboratory for testing. Welding material needs re-rest of welding; Purchased tower attachments also need retest. Any non-conforming material should be avoided to enter into the production line.
2. Mark sample number After sample plate and rod made, all the samples need to be approved by customers, then reviewed and marked number. Marked number with digital control, steel tower needs to retain head margin when cutting according to process requirement, diameter of both tube ends need the conformance with matching welding tube. The deviation is not more than ± 1.5D/1000, the total height deviation is no more than H/1500.
3. Rolling tube After marked number and qualified, then turn to roll tube. To keep the ellipticity of the sheet plate, rolling on rolling machine where roller can move horizontally, then weld the connecting line and recheck. Visual inspection after rolling, the roundness should not exceed 3mm.
4. Welding After tube bending, inspection and approval, it goes to automatic welding. Before welding, bevel angle is 25 degrees, also welding edge needs removing rust, burrs and dirt, electrode must be dried, coating drops or rust core are not allowed, and damp solder is also not allowed. Clean each welding line and inspect, then re-weld after clear defects. After welding slag and spatter need to be cleaned up. Select T-joints and 20% nearby welding line on main tower UT test to achieve GB11345-1989BII.
5. Flange installation The flange needs automatic welding and UT test qualified. After installation and appearance inspection, inspect the angle dimension, so as to make sure the tower get installed smoothly.
6. Test assembly Each section of the tower needs assembly test. The technical department will make a complete inspection, including the welding line mechanical property, the tower dimensions (length deviation, connection flatness and straightness, tower tube ovality, tube diameter deviation) must comply with requirement before turning to next stage.
7. Galvanizing After tower assembly test galvanizing will apply. Hot dip galvanizing coating thickness needs 86um <M<200um and anti-corrosion more than 30 years. Visual inspection after galvanizing, residual point will be not more than 1 cm2, smooth surface, no zinc tumor and thorns.
8. Inspection after galvanizing Test assembly again after galvanizing qualified, and the requirements are the same with previous test assembly. If there is deviation it needs correction, then turn to next stage.
9.Painting Grinding zinc coating by sand blasting or abrasive paper to make the surface flatness and smoothness but not to damage zinc coating, then spay 6 layers painting to make sure the tower's service life.
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angle steel or tubular steel
Q235, Q345 (A36, A572 Gr.50) or others
CO2 welding or Submerged arc auto methods
Parts for connection or installation will be provided