1. Welding process: In the welding process, the welding method of the spiral steel pipe and the straight seam welded pipe is the same, but the straight seam welded pipe will inevitably have many T-shaped welds, so the probability of welding defects is greatly increased. The welding residual stress i

Push-made steel elbow: the process of pushing steel elbow with machinery + mold inner tube + intermediate frequency heating method, but later it is probably difficult to control the inner and outer wall thickness, and it is rarely used in practice. Socket weld elbows: most are forged. Sockets are us

The seamless steel pipe is a tubular section or hollow cylinder. It is formed by drawing a solid billet over a piercing rod to create a hollow shell, without welding or seam. It can withstand higher pressure resistance. So seamless steel pipe can use to transport flow liquid, gas, and other material

Steel elbows are divided into welded and seamless. The main difference lies in the raw materials. Seamless steel elbows are made of seamless pipes. Welded steel elbows refer to butt-welded steel elbows and straight seam steel elbows.The difference between the butt-welded steel elbow and the seamless

The processing of the outer anti-corrosion layer of the steel pipe must strictly follow the design requirements and relevant national standards. Rust removal must reach Sa2.5 level, and the primer must be applied within 2 hours after the rust removal is completed. After the primer is dry, the anti-c

Galvanized steel pipe, commonly known as cold-galvanized pipe, adopts an electroplating process, only the outer wall of the steel pipe is galvanized, and the inner wall of the steel pipe is not galvanizedThe hot-dip galvanized steel pipe adopts the hot-dip galvanizing process, and the inner and oute

Causes and preventive measures of single-sided undercut:In the production process of submerged arc welded steel pipes, especially in high-speed welding, the undercut has become the main defect in the production process of spiral submerged arc welded steel pipes. The defect of undercut mainly has the

Large diameter spiral steel pipe in big size. It is the steel belt bending molding and then welded up, made into a specified size of large-caliber spiral steel pipe, and processed into a pipe, to carry out hydraulic testing, bending, flattening, and other tests, and according to the customer's requi

(1) When the pipes of the fire hydrant water supply system adopt hot-dip galvanized steel pipes with inner and outer walls, welding should not be used. When the system pipeline adopts a non-corrosion inner wall, it can be welded, but the welding of the pipeline should meet the relevant requirements.

Large-diameter steel pipes are also called large-diameter galvanized steel pipes, which refer to welded steel pipes with hot-dip or electro-galvanized layers on the surface of large-diameter steel pipes. Galvanizing can increase the corrosion resistance of steel pipes and prolong their service life.