LSAW Steel Pipe

　　Flat weld flanges are flanges that are welded directly to equipment or piping by fillet welds. The structure is simple and the processing is convenient. The force characteristics are between the integral flange and the looper flange. The flat weld flange is divided into a plate type flat weld flange and a neck flat weld. The flat weld flange has low cost and short production cycle, which is the most commonly used. A flange type that is widely used in various fluid lines. 　　Flat welding flange has a beautiful shape and a smooth and smooth appearance. It is mainly used for the connection of carbon steel pipes , and its nominal pressure does not exceed 2.5 MPa. 　　Flat welding flange is resistant to acid and alkali, anti-corrosion, and strong in texture. It is made of i-oxygen furnace, and the whole forging or forging product is forged and formed by high-precision CNC lathe turning and CNC rocker drilling. 　　The joint method of the flat welding flange includes single-sided welding ...

　　Welded neck flange generally use forging or forging process is made. Elected with steel or steel production, it is necessary to meet the following requirements: 　　1. Welded neck flange should be ultrasonic flaw detection, no delamination defects; 　　2. Should be cut along the direction of the steel strip into a bar, butt welded into a ring, and the surface of the steel ring cylinder. Shall not be machined directly into the plate with a neck welded flange; 　　3. Ring butt weld should be used fully welded weld; 　　4. Ring butt weld should be post-weld heat treatment, and for 100% ray or ultrasonic flaw detection and ray inspection meet JB4730 class II requirements, ultrasonic flaw detection meet JB4730 class I requirements.