Butt Welding 48 Inch ANSI B16.9 Pipe Fittings Cross

Hot Selling Asme B16.9 Stainless Steel Cross Butt Welding Cross

Butt-welded cross is a kind of pipe fittings used at pipeline branches. Butt-welded crosses are divided into equal diameters and reducing diameters. The ends of equal diameter crosses are all the same size; the main pipes of the reducing crosses have the same size, while the branch pipes are smaller than the main pipe.

Basic introduction

Butt-welded crosses are pipe fittings made of steel by hot pressing or forging. Its connection form is to directly butt-weld the crosses with steel pipes. The main manufacturing standards for butt-welded crosses are generally GB/T12459, GB/T13401, ASME B16.9, SH3408, SH3409, HG/T21635, HG/T21631, SY/T0510.

Currently, the commonly used processes include hydraulic bulging and hot pressing.

a. Hydraulic bulging The hydraulic bulging of the butt-welded cross is a forming process in which the branch pipe is expanded by the axial compensation of the metal material. The process is to use a special hydraulic press to inject liquid into the tube blank with the same diameter as the butt-welded spool, and to squeeze the tube blank through the two horizontal side cylinders of the hydraulic press. The volume of the tube blank becomes smaller after being squeezed. The liquid in the billet increases as the volume of the billet becomes smaller. When the pressure required for the butt-welded four-way branch pipe to expand is reached, the metal material flows along the cavity of the mold under the dual action of the side cylinder and the liquid pressure in the billet. Expand the branch pipe. The hydraulic bulging process of the butt-welded cross can be formed at one time, and the production efficiency is higher; the wall thickness of the main pipe and the shoulder of the butt-welded cross are increased. Due to the large tonnage of equipment required for the hydraulic bulging process of seamless butt-welded crosses, it is currently mainly used in the manufacture of standard wall thickness crosses less than DN400 in China. The applicable forming materials are low-carbon steel, low-alloy steel, and stainless steel with a relatively low tendency of cold work hardening, including some non-ferrous metal materials, such as copper, aluminum, and titanium.

b. Hot-press forming butt-welded four-way hot-press forming is to flatten the tube blank larger than the diameter of the butt-welded four-way, and open a hole in the stretched branch tube; the tube is heated , Put it into the forming die, and insert a die for stretching the branch pipe into the tube blank; the tube blank is radially compressed under the action of pressure, and the metal flows in the direction of the branch tube during the radial compression process and is stretched by the die Form a branch. The whole process is formed by the radial compression of the tube blank and the stretching process of the branch tube.