When performing straight seam steel pipe cutting, there are several important considerations to know and follow to ensure quality and safety of the cut. The following are some of the precautions

LSAW steel pipe is a kind of welded steel pipe. Steel pipe parallel to the longitudinal direction of the steel pipe. After the hot rolled steel coil is formed by forming machine, the said coil is converted into a cylinder and welded by using high frequency current skin effect and proximity effect or arc combustion under the flux layer, so that the edge of the pipe billet is heated, melted, fused and cooled to form under a certain extrusion pressure, correct, petroleum, metallurgy, construction, coal mine, port, machinery, and other industries are widely used in the transportation of oil and gas, low-pressure water and gas transportation, mine fluid transportation , belt conveyor, automobile drive shaft and other industries.

First, the premise should be polished However, the galvanized layer of the weld must be polished off, otherwise it will produce bubbles, trachoma, false welds and so on. It will also make the weld brittle and less rigid.

Spiral pipe, also known as spiral steel pipe or spiral welded pipe, is a low carbon structural steel or low alloy structural steel steel strip according to a certain angle of the helix (called molding angle) rolled into a billet, and then welded the pipe joints made of it, it can be used to produce large diameter steel pipe with a narrower strip.

Steel pipe can be divided into two categories according to the production method: seamless steel pipe and seamed steel pipe. Seamed steel pipe is referred to as straight seam pipe. 1.Seamless steel pipe can be divided into two categories according to the production method: hot rolled seamless pipe, cold drawn pipe, precision steel pipe, hot expanded pipe, cold rolled pipe and extruded pipe. Seamless steel pipe is made of high-quality carbon steel or alloy steel, hot rolled, cold rolled (drawn).

1, tungsten can improve the red hardness and thermal strength of spiral steel pipe, and can improve the wear resistance of spiral steel pipe. 2, silicon; it can improve the hardness of spiral steel pipe, but plasticity and toughness decline, electrician spiral steel pipe contains a certain amount of silicon, can improve the soft magnetic properties.

Welding current In LSAW pipe multi-wire submerged arc welding, all the wire welding current increases, the height of the weld will increase, but different wires increase to different degrees. Usually the first wire of the welding current in all the wire in the largest, it changes relative to other wires will cause a large change in the height of the residual, and the middle of the wire relative to the last wire to be a little stronger. Similarly, the first wire welding current on the weld depth of fusion also has the greatest impact, the middle wire as a weld filler on the weld depth of fusion is relatively small, the last wire has almost no effect on this. This point in the automation forum has also seen related reports. Therefore, in the preparation of multi-wire submerged arc welding welding process, should be the first wire welding current is the largest, followed by the middle, the last one is the smallest.

First, how to categorize spiral steel pipe according to the working method? Hot expanded steel pipe pipeline irrigation system based on the work in the method can be divided into portable, semi-fixed and fixed.

Seamless steel pipe hot dip coating surface in the solidification of the coating metal crystallization pattern, this crystallization pattern of galvanized seamless pipe is particularly obvious, showing the appearance of beautiful zinc crystals, and thus become an important feature of the appearance of hot-dip galvanized seamless pipe, usually referred to as this crystallization pattern for the “zinc flower”. When the galvanizing solution contains other metal impurities, zinc flower is produced. Zinc flower size and shape depends on the type and amount of impurities contained in the galvanizing solution, common impurities are lead, aluminum, antimony, bismuth, tin and other metals.

(A) rolling groove weld cracking 1, will be the mouth of the pressure groove part of the inner wall of the weld rib grinding, reduce the rolling groove resistance. 2, adjust the axis of the steel pipe and rolling groove equipment, and require the steel pipe and rolling groove equipment level. 3, adjust the pressure groove speed, pressure groove molding length can not exceed the provisions of the uniform, slow application of force.

Double-sided submerged arc welding straight seam steel pipe main process description (1)Check the raw materials in various ways. Raw materials generally refer to the strip coil, welding wire, flux and so on. Before put into the strict physical and chemical inspection, in order to ensure the quality.

Why steel pipe should be anticorrosion? As the name suggests, steel pipe anticorrosion is to prevent corrosion of steel pipe, reducing the service life. pe anticorrosive steel pipe processing transmission of petroleum, water, natural gas and other pipeline projects, will use the steel pipe as an economic transmission material, but some of the material and chemical elements of the steel pipe decide that it does not have a long term resistance to corrosion, which greatly shortens the service life, regardless of whether it is buried or overhead, will be faced with the problem, then, how to Solve this problem? Later, people invented to the outer wall or inner wall of the steel pipe to do coating anti-corrosion, to effectively control and prevent steel pipe corrosion method.

For the installation and use of straight seam steel pipe, there are strict technical requirements, according to the actual situation, but also in accordance with the operating procedures to ensure safety and quality. In the general use process, LSAW steel pipe needs to pay attention to the following points:

Carbon tool steel ① steel number is crowned with “T”, so as not to be confused with other steels. ② steel number in the number of carbon content, the uniform carbon content of a few thousandths. For example, “T8” indicates that the uniform carbon content of 0.8%. ③ manganese content is higher in the steel number marked at the end of the “Mn”, such as “T8Mn”. ④ high-quality carbon tool steel phosphorus, sulfur content, lower than the general quality of carbon tool steel, in the steel number at the end of the letter “A”, to show the difference For example, “T8MnA”.

Steel pipe appearance, seamless steel pipe and welded steel pipe difference in the welded pipe inside wall has welded rib, while the seamless does not.