Q355b welded s
Q355b reelHow The so-called expanding diameter actually belongs to the pressure processing technology that uses hydraulic or mechanical pressure to apply customized to the inside of the steel pipe, so as to expand the steel pipe outward along the radial direction. Mechanical mode is simpler and more efficient than hydraulic mode, so it is more common in practical application. In particular, it is adopted in the very advanced expanding process of several large-diameter straight seam rolling pipelines.
Meet the following requirements: 1. The longitudinal joint of butt joint shall not be greater than 10% of the wall thickness plus 2mm, and shall not be greater than 3mm. 2. The longitudinal joint of joint 200mm away from the pipe end shall not be greater than 2mm. 3. Other parts shall not be greater than 1mm. 4. The vertical deviation between the end face of coiled pipe and the center line shall not be greater than percent of the outer diameter of pipe and shall not be greater than 3mm. The straightness deviation shall not exceed 1mm / m. 5 the weld cannot be double-sided molded coiled pipe. When the nominal diameter is greater than or equal to 600mm, it is recommended to seal and seal in the pipe. In order to obtain better uniform cleanliness and roughness distribution, the particle size and proportion design of rinse agent is very important. The roughness is too large, which may cause the anti-corrosion layer to become thinner at the peak of the cloud path. At the same time, because the cloud path is too deep, bubbles are easy to form in the process, which seriously affects the performance of the layer.
.During the polishing process, a thick layer of iron, nickel and other impurities will be deposited on the surface of the cathode lead plate which will affect the conductivity of the cathode surface of the steel coil tube, resulting in the decrease of current, the negative removal of the polished surface, and seriously affect the polishing quality. Therefore, the deposits on the cathode plate shall be removed in time. Sometimes a hard thick film is formed, which can only be removed by knocking, and then washed clean, the steel plate can be sandblasted to eliminate the iron oxide scale on the surface of the steel plate and ensure the raw materials on the cylinder surface during the processing process.
.1 carbon structural steel: q215-a,16Mn welded pipe,Q215-BQ215-B· F,Q235-A,Q235-A· F,Q235-B,Q235-B· F. Q235-c ordinary carbon steel: B2 BY2 B2F by2f B3 by3 B3F by3f a2ay2 a2f ay2f A3 ay3 A3F ay3f2 high quality carbon steel: 10 15 20 transmission shaft steel 3 low alloy structural steel: 123mn 16Mn 19mn 08ti 10ti15ti4 special purpose steel thick wall coil is made of steel plate. Long term coil, Q345B coil, large diameter thin wall coil, large diameter thick wall coil, stainless steel coil, L360 coil, 16Mn coil, 20 old brands, with price advantages and quality! Thick wall coil can be divided into two types: hot coil and thick wall coil.
The longitudinal weld of the same barrel part of the coiled pipe shall not be greater than 2.
In short, the use standard of coiled steel pipe is very important, and the above points can be reasonably explained. For the information of our rolled steel pipe, let's simply say so much today. If you need it, you can directly consult our manufacturer.
The weld reinforcement is increased, the weld formation is deteriorated and the edge transition is poor.
8-100mm steel pipe.
The weld reinforcement is increased, the weld formation is deteriorated and the edge transition is poor.
OK or not?.When the nominal diameter is greater than or equal to 600mm, back welding shall be carried out in the pipe.
steel products.
Hot rolled steel pipe is a kind of thick wall steel pipe rolled under the condition of heating the steel plate.
It has advantages and quality. The weld reinforcement obtained is increased,Q345B straight seam welded pipe, the weld formation is deteriorated and the edge transition is poor.
investment.The influence of welding process parameters mainly includes two aspects: according to the production characteristics of spiral steel pipe, the welding current is usually smaller for internal welding and larger for external welding. However, under the condition of large welding current, the stirring effect of molten pool is intensified and the melting amount of welding wire is also the same
2PE / E shall comply with SY / t0413-2002 (test) technical standard for polyethylene outer coating of buried steel pipeline
The influence of welding process parameters on welding current mainly includes two aspects: according to the production characteristics of spiral steel pipe, small welding current is usually used for internal welding
.First, select the specification and put forward the pipe, such as 90 & deg; Elbow, which can calculate the curvature to calculate the 90 DEG of the long material; Elbow, and then cut with the length as the fixed length.
The rolled pipe shall meet the specified arc degree, end face deviation, straightness, etc.
The distance between the two longitudinal slits of the reel assembly shall be greater than 100mm. The distance between the outer wall of the branch pipe and the weld shall not be less than 50mm.