Key points of grid structure construction

       I、 The joint forms of grid structure include bolt ball, welding ball, etc. Bolt ball is composed of steel ball, high-strength grid bolt, pin, sleeve, cone head and sealing plate. Generally, it is produced by a professional factory and assembled on site. The drawing and processing of bolt ball need a series of technologies such as plane processing, angle division, drilling, tapping and inspection. The bolt ball shall be hot forged, and the appearance quality shall be free of cracks, wrinkles and overburning, and the oxide skin shall be removed.

       II. The welding ball is a hollow ball, which is made of two hemispheres by butt welding. There are two kinds of welding balls: non ribbed and ribbed. The important nodes of the steel grid are generally stiffened welded joints, and the stiffened forms include single rib, vertical double rib, etc. Therefore, before assembling the stiffened ball, it should be stiffened and welded. Note that the height of the rib should not exceed the inner surface of the ball, so as not to affect the assembly.

       1. When cutting the welding ball, the size shall be controlled and appropriate allowance shall be made.

       2. The welding ball material shall be heated to a proper temperature of 600-00 in a heating furnace, placed in a semicircle inspection tool, and gradually pressed into a semicircle ball to take measures of uniform heating. During pressing, the oxide skin shall be cleaned in time, and the semicircle ball can change its position in the mold,

       3. After the semicircle ball is corrected and cut,

       4. After the semicircle ball is formed, take it out from the tire County for cooling, bevel the joint, correct the semicircle ball with the sample plate, and leave the splicing allowance. The angle and form of groove shall meet the design requirements.

       5. During ball assembly, there shall be mould to ensure assembly quality.

       6. The welding ball splicing is full penetration weld, and the weld quality grade is grade II. Put the assembled ball on the welding face tool, make a small hole on both sides of the tool to fix the ball, and rotate it slowly. Rotate the ball for one circle, adjust the welding parameters, and weld the ball in multiple layers and passes with burai welding (or gas shielded welding) until the weld is filled.

       7. The weld appearance shall be smooth without cracks and wrinkles, and the weld reinforcement shall meet the requirements. After the inspection is qualified, ultrasonic flaw detection shall be carried out for the steel ball weld after 24 hours.

       Pay attention to Ningbo Shengdu fastener Technology Co., Ltd. and learn more about grid structure products!