Welding elbow is "shrimp bends", which can be in or on a steel plate welded pipe after cutting stock from the system, its specifications can be great. The number of sections with a bending radius bend freely determined by the producer. Welding is not very round bend along both bend radius are not large, usually about 1 times the pipe diameter. As for the appearance of weld elbow, then we talk about it the appearance of welding elbow. After welding elbow looks are fixed, of course, the general appearance of the welding elbow are depending on the selection of welding steel pipes and elbows different knowledge, therefore, in order to protect the weld elbow appearance, usually come in steel If there is no rain is washing over into the yard, then after high temperature welding elbow to push the system, general appearance are welded elbow appeared blue, of course, if the rain washed over, we conduct high temperature heating , out of the heating surface colors are red welding elbow. But on the whole, we do not guarantee rain wash pipe is difficult, because the yard is among the summer rain had rinsed after fog, then the surface of the elbow to push the system out of the welding is red. Since most of these fittings for welding, in order to improve the quality of welding, to the ends of both drive groove, leaving a certain angle, with a certain side, which require a relatively stringent, more thick side, the number and angle deviation range there are provisions on the geometry of the tube a lot more than the items. Surface quality and mechanical properties of basic and tubes is the same. In order to facilitate welding, and the steel pipe is connected is the same. The fourth is that all the fittings go through a surface treatment, the inner and outer surfaces of the oxide scale spraying out by shot peening, and then coated with anti-corrosion paint. This is required in order to export, moreover, in the country but also for the convenience of transportation to prevent corrosion oxidation, have to do this work. Fifth, is the packaging requirements for small pipe fittings, such as export, you need to make a wooden box, about one cubic meter, the provisions in this case is not about the number of bends over one ton, the standard allows suits, namely large set small, but the total weight is generally not more than 1 ton. For large should a single package, like 24〃 a single package must.