Procurement and installation of carbon steel seamless elbow attention to which

Large carbon steel seamless elbows are usually produced according to detailed project standards or drawings, not only considering the standard of pipeline specifications

We must also consider the details of pipe transfer resistance, fluid viscosity, damage, erosion, fluid transfer temperature, etc. Next, large seamless elbow manufacturers will give you a detailed introduction to the assembly of large seamless elbow need to pay attention to matters.

Matters needing attention when assembling seamless elbow

After the assembly of large carbon steel seamless elbows is completed, it is necessary to carry out anti-rust or corrosion cleaning according to the actual situation of pipelines or environmental factors, so as to prevent corrosion or corrosion of elbows in spot welding, resulting in too short service life of elbows.

To prevent changes in the process of processing, the layer outside both sides of the elbow, tile with stainless steel curved plate and keel to carry out correction structure reinforcement, according to the traditional welding technology, to carry out argon spot welding, considering the cost of spot welding and shrimp waist tube diameter is too large, too difficult to fill argon.

Combined with the above factors, the internal and external welding machines are selected for symmetrical spot welding at the same time, which not only solves the phenomenon of argon filling, but also has excellent formability. Argon spot welding technology is used. Argon arc welding is selected as the bottom layer.

Before the welder operation, brush the chalk powder in the 90mm area before and after the spot welding to avoid splashing and sticking to the surface of the pipeline. Select a small current flow before the spot welding operation. Many layers, multiple paths, continuous spot welding.

In order to avoid corrosion caused by heating, spot welding current should not be too large, less than carbon steel electricity before and after 19%, arc can not be too long, rapid refrigeration between layers, spot welding narrow, until the whole welding is completed

Polish the welding spots and spatters on the surface of large seamless elbows, carry out non-destructive testing on the prefabricated spot welding tiles, and carry out pickling and passivation cleaning on the surface of spot welding inside and outside. The pickling elbow will be transported to the assembly site to carry out the final assembly work.

Purchasing carbon steel seamless elbow notice which

First of all, we must determine the purchase of carbon steel elbow specifications, that is, the caliber of the elbow, and the standard elbow, pressure grade or wall thickness, pressure grade and wall thickness know one can be converted, followed by the material of the elbow, and then is the problem of corrosion, whether the elbow needs to be painted or sandblasted

Some unscrupulous pipe fitting manufacturers use irregular materials, usually judged by nickel content. Although you can use potions to distinguish, but obviously this is a mistake, because small furnace material containing nickel only 7 more is impossible to distinguish, but the price difference of raw materials is very big, this is one of the false.

In particular, 321 high nickel and 316 high nickel false is very serious. So when purchasing elbow, we must pay attention to the material problem of elbow. In order to ensure the quality of elbow, general valve recommends that you find a reliable and regular manufacturer to buy.