Butt welding elbow can also be called the big elbow, stainless steel elbow, carbon steel elbow, are steel hot-pressing molding or bend forging forming, its connection form is directly to the elbow and steel pipe butt welding.

Butt welding elbow after completion of the welding operation need according to the actual situation to rust or corrosion resistance or pipe external environment, to avoid a bend in the weld, rust or corrosion caused by bend too short service life.

The butt welding is a kind of resistance welding method that USES the resistance heat to weld the two parts together at the same time. The high productivity and easy automation of welding are widely used.

Application scope of welding elbow:

1. The length of the workpiece shall be welded with steel, profile, wire, steel, rail, boiler tube, oil and natural gas pipeline.

2. The butt welding of the circular workpiece, such as the butt welding of the car rim and the bicycle, the cycle of the motorcycle, the welding of various links, etc.

3. The welding of parts shall be simple rolling, forging, stamping or machining parts to be welded into complex parts to reduce costs. For example, the welding of the car orientation shaft shell and the rear axle housing, the welding of various connecting rods and rods, and the welding of special parts.

4. Welding of foreign metals can save precious metals and improve product performance. Such as work part of the tool (HSS) and tail (medium carbon steel butt welding, internal combustion engine exhaust valve head (heat resistant steel) and tail (steel) butt welding, butt welding of aluminum copper conductive coupling, etc. Butt welding is divided into two kinds: resistance butt welding and flash butt welding.

Welded elbow is steel hot-pressing molding or bend forging forming, its connection form is directly to the elbow and the steel pipe butt welding, butt welding elbow generally main manufacturing standards GB/T12459, GB/T13401, ASMEB16.9, SH3408, SH3409, HG/T21635, HG/T21631, SY/T0510.

Classification of welding elbow:

1. The welding elbow is divided into the radius of curvature, which can be divided into long radius butt welding elbow and short radius butt welding elbow. Radius of curvature of long radius is equal to 1.5 times the diameter of pipe, namely R= 1.5d. The curvature radius of the short radius is equal to the diameter of the pipe, which is R= 1D. D is the diameter of the welding elbow and R is the radius of curvature.

2. If according to the pressure level, there are about 17, and the pipe standards in the United States are the same, including: sch-5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS, which are commonly used are STD and XS.

3. According to the Angle of the bend, 45 degrees butt welding elbow, 90 degrees butt welding elbow and 180 degree welding elbow.

4. Materials: carbon steel, alloy steel and stainless steel.