To live up to the task and have a long way to go

 　　Tianjin Xinyue team fully cooperate with customers and third parties in 2600 tons anti-corrosion pile pipe project in South America, and from leadership to quality control, it makes every effort to cooperate with the third party inspection, and each production is strictly in accordance with the standard. The third party shall supervise the whole process, from raw materials to anti-corrosive products to port, and the third party shall pass 100% full inspection and pass the signature before the next step can be pushed forward. From the raw material physical and chemical inspection, dimension checking, UT inspection, welding record and corrosion protection sand blasting level 2.5, anti-corrosion inspection are strictly in accordance with ITP, even higher than the production standard, but Tianjin Xinyue can meet the requirements of customers and meet the requirements of customers. At the same time, Tianjin Xinyue has learned the spirit of perseverance and excellence from customers through this project.

　　According to the original contract plan, November bulk carriers are scheduled. However, due to the outbreak of global epidemic, the original scheduled bulk carrier changes its sailing schedule and does not leave for Tianjin port. In order to meet the urgent demand of the project site, Xinyue exchanges high prices for other cargo ships, so as to catch up with the customer's delivery schedule. However, affected by the epidemic again, the crew on the cargo ship went on strike. In addition to the new cases in China, many ports refused to exchange crew members. Fortunately, after changing crew members, everything began to go smoothly. According to the actual situation, Tianjin Port was heavily under pressure, and many bulk carriers were waiting at the anchorage for 10 days and a half months, which was normal. Due to the customer's urgent project, Tianjin Xinyue's Logistics Department Actively communicate and cooperate with forwarders and shipowners for many times, and must berth and load immediately.

　　Tianjin Xinyue has rich experience in operation of project list. We believe that the team is not afraid of difficulties, perfect to overcome every link of the problem. From the third party, it is required to conduct 100% UT test at the weld of each steel pipe, and it is required to wait 24 hours for cooling before UT test. Every link is carried out in strict accordance with ITP, from steel pipe production to anti-corrosion, shipping and port loading, the third party is in the whole process, and customers are involved in the whole process.

　　Xinyue actively cooperates with the third party to inspect every production link. Although it is hard in the process, it has been recognized by professional TUV inspectors and satisfied by customers. Everything is worth it.

　　At the same time, Tianjin Xinyue technical team and document team actively cooperated with customers to make project documents, and completed the most comprehensive pile pipe project documents in Xinyue's history, with more than 2000 pages of project documents.

　　At the beginning of February, the customer flew to Xinyue Changsha branch to make a project summary, and the customer put forward many valuable opinions. At the same time, through this cooperation, Xinyue and the customer have established a deeper understanding and cooperation. I believe that through this project operation, it has done a strong foundation for the follow-up new projects.

　　In early March, the bulk vessel successfully arrived at the port of destination, and the steel pipe was directly unloaded to the barge designated by the customer at the port of destination. Xinyue has rich experience in the operation of bulk carrier's main management, requiring that the cooperative bulk carrier must have unloading equipment and professional operators. At the same time, because of the difficulty and long time of unloading operation due to the epidemic situation, Xinyue considered the unloading time of 5 days in advance in order to save the cost of customers. I believe that through this cooperation, the customers are very sure of Xinyue's operation ability, believe that this is only the beginning of a project, and look forward to a steady stream of new projects in 2021.

　　http://www.tjxysteel.com/news/To-live-up-to-the-task-and-go-long-way-1754.html

Seamless Steel Pipe for Bearings

 　　Bearing seamless steel pipes are also called high-carbon chromium seamless steel pipes. The carbon content Wc is about 1%, and the chromium content Wcr is 0.5%-1.65%. Bearing seamless steel tubes are divided into six types: high-carbon chromium bearing seamless steel tubes, chromium-free bearing seamless steel tubes, carburized bearing seamless steel tubes, stainless bearing seamless steel tubes, medium and high temperature bearing seamless steel tubes, and antimagnetic bearing seamless steel tubes.

　　High-carbon chromium bearing seamless steel pipe GCr15 is the world’s largest production of bearing seamless steel pipe. The carbon content Wc is about 1%, and the chromium content Wcr is about 1.5%. Since its birth in 1901, it has basically no main components for more than 100 years. Change, with the progress of science and technology, research work continues, product quality continues to improve, accounting for more than 80% of the world's total production of seamless bearing steel pipes. So if there is no special description for bearing seamless steel pipe, it refers to GCr15.

　　Bearing seamless steel tubes are steel used to make balls, rollers and bearing rings. Bearing seamless steel pipes have high and uniform hardness and wear resistance, as well as high elastic limit. The requirements for the uniformity of the chemical composition of the bearing seamless steel pipe, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict. It is one of the most stringent steel grades in all steel production.

　　In order to meet the above requirements for the performance of dynamic bearings, the following basic performance requirements are proposed for bearing seamless steel pipe materials:

　　1) High contact fatigue strength

　　2) After heat treatment, it should have a high hardness or a hardness that can meet the performance requirements of the bearing

　　3) High wear resistance, low friction coefficient

　　4) High elastic limit

　　5) Good impact toughness and fracture toughness

　　6) Good dimensional stability

　　7) Good anti-rust performance

　　8) Good cold and hot processing performance

　　Main standards for bearing steel pipe:

　　ASTM A 295: wearable high-carbon bearing steel pipe

　　ASTM A 534: wearable and cementite bearing seamless steel pipe

　　JIS G 4805: high-carbon chromium bearing seamless steel pipe

　　DIN 17230: ball bearing steel pipe

　　NF A 35-565: steel product

　　Steel grades of bearing steel Pipe:GCr15 (52100, SUJ2, SUJ3, 100Cr6, SKF3, SKF3S), 20CrNiMo (8620H, 4118H).

　　http://www.xysteelpipe.com/info/Seamless-Steel-Pipe-for-Bearings-1988-1.htm

Production technology of straight seam welded pipe

 　　Straight seam welded pipes, steel pipes made of hot-rolled or cold-rolled steel plates or steel strip coils welded on welding equipment, are all called straight seam welded pipes. (The name is given because the welds of the steel pipe are in a straight line).

　　Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. Straight seam steel pipes can be divided into high-frequency straight seam steel pipes (ERW tube) and submerged arc welded straight seam steel pipes (LSAW tube) according to the production process. Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development.

　　Description of the main production process of large diameter straight seam welded pipe:

　　1. Plate inspection: After the steel plate used to manufacture the large-diameter submerged arc welded straight seam steel pipe enters the production line, the full plate ultrasonic inspection is first carried out;

　　2. Edge milling: double-sided milling of the two edges of the steel plate by a milling machine to achieve the required plate width, plate edge parallelism and bevel shape;

　　3. Pre-bending: Use a pre-bending machine to pre-bend the edge of the board so that the edge of the board has a curvature that meets the requirements;

　　4. Forming: On the JCO forming machine, first half of the pre-bent steel plate is pressed into a "J" shape through multiple stepping steps, and then the other half of the steel plate is also bent and pressed into a "C" shape, and finally an opening is formed "O" shape

　　5. Pre-welding: Join the formed longitudinally welded steel pipes and use gas shielded welding (MAG) for continuous welding;

　　6. Internal welding: use longitudinal multi-wire submerged arc welding (up to four wires) to weld on the inner side of the straight seam steel pipe;

　　7. External welding: use longitudinal multi-wire submerged arc welding to weld on the outside of the longitudinal submerged arc welded steel pipe;

　　8. Ultrasonic inspection I: 100% inspection of the inner and outer welds of the longitudinally welded steel pipe and the base materials on both sides of the weld;

　　9. X-ray inspection I: 100% X-ray industrial TV inspection of the inner and outer welds, using an image processing system to ensure the sensitivity of flaw detection;

　　10. Diameter expansion: expand the total length of the submerged arc welded straight seam steel pipe to improve the dimensional accuracy of the steel pipe and improve the distribution of the internal stress of the steel pipe;

　　11. Hydraulic test: The expanded steel pipes are inspected one by one on the hydraulic testing machine to ensure that the steel pipe meets the test pressure required by the standard. The machine has automatic recording and storage functions;

　　12. Chamfering: Process the pipe ends of the steel pipes that have passed the inspection to meet the required pipe end groove size;

　　13. Ultrasonic inspection Ⅱ: Perform ultrasonic inspection again one by one to check the possible defects of the longitudinally welded steel pipe after the diameter expansion and water pressure;

　　14. X-ray inspection Ⅱ: X-ray industrial television inspection and pipe end weld filming of the steel pipe after the expansion and hydraulic test;

　　15. Tube end magnetic particle inspection: carry out this inspection to find tube end defects;

　　16. Anti-corrosion and coating: Qualified steel pipes are anti-corrosion and coating according to user requirements.

　　http://www.xysteelpipe.com/info/Production-technology-of-straight-seam-welded-pipe-1895-1.htm

Casing Pipe Quality Control Procedure

 　　1. In order to ensure that the original and auxiliary materials used are qualified products, the company evaluates and selects qualified suppliers according to GB/T19001-2000-ISO9001:2000 and API standards. Inspected by the raw material inspector of the Quality Management Department, unqualified raw materials and accessories may not be put into use.

　　2. Casing pipe diameter test: This test is used to detect the straightness of the pipe body and detect whether there is a bump in the pipe wall.

　　3, Quality inspection is for the finished product testing, quality inspection staff need to check to ensure that the product has no obvious defects and all the tubes are in compliance with the required parameters and length.

　　4. Tubing collar size and appearance inspection: QC staff inspects the size and surface of the steel pipe to ensure compliance.

　　5. Hydrostatic test: The pipe body will be rolled into the hydrostatic tester and water will be injected into the pipe body to ensure that the pipe body can withstand the internal water pressure and ensure that the pipe body does not leak.

　　6. Physical and chemical analysis of casing collar: This test is used to analyze the chemical composition, mechanical properties, and metal structure of the raw materials in the pipe.

　　7. Casing pipe thread test: The production personnel will physically inspect the thread after the yarn stage in the production process to ensure compliance.

　　http://www.xysteelpipe.com/info/Casing-Pipe-Quality-Control-Procedure-1896-1.htm

Special Thread for API Casing Pipe

 　　API casing threads are not suitable for the development of high-pressure gas fields, so many manufacturers have developed special joints with their own characteristics. Among them, the gas-sealed special joint thread types suitable for the development of gas fields are:

　　1. NS-CC thread (developed by Nippon Steel), its main features are:

　　1.1 The thread adopts improved API partial trapezoidal thread. High tensile strength of the joint;

　　1.2 Cone surface and cone surface metal main seal and inner shoulder metal secondary seal, so that the joint has good air tightness;

　　1.3 The stepped double straight shoulder structure makes the joint have good anti-torsion and bending ability, and is beneficial to protect the main seal;

　　1.4 The circumferential stress on the joint is lower, which helps prevent stress corrosion cracking.

　　2. Fox thread (co-developed by Kawasaki Steel in Japan and Hunting in the UK).

　　3. TM thread (Japan Sumitomo Metal's improved design based on VAM thread)

　　4. SEC thread (designed and produced by Siderca, Argentina)

　　http://www.xysteelpipe.com/info/Special-Thread-for-API-Casing-Pipe-1897-1.htm

Why does Hot-dip Galvanized Seamless Steel Pipe Cause Chromatic Aberration?

 　　Why does hot-dip galvanized seamless steel pipe cause chromatic aberration?

　　Mainly due to the violent reaction of iron and zinc. The violent reaction of Fe-Zn makes the original complete coating composed of alloy layer and pure zinc layer become the phenomenon of only alloy layer and no pure zinc layer. Gray or dark gray is the color of iron-zinc alloy. In addition, if the quality of the zinc solution deteriorates, the iron content in the zinc solution will increase, and the pure zinc layer on the surface after galvanizing will appear gray due to iron content, causing color difference.

　　Specific reasons:

　　(1) The material of the plated parts contains more elements such as carbon, silicon, sulfur, and phosphorus. The electrochemical reaction between iron and zinc is due to the inert electrode formed by this type of element, and the relative potential becomes higher, which causes the iron and zinc reaction to intensify.

　　(2)The content of aluminum and other metal elements in the zinc solution is too small, and for active steel and other materials galvanizing, the iron-zinc reaction cannot be effectively inhibited.

　　(3) The increase in iron content in the zinc liquid deteriorates the quality of the zinc liquid.

　　Improvement measures:

　　⑴ According to the material, choose the appropriate galvanizing temperature;

　　⑵ Adjust the composition of zinc liquid to control the content of aluminum and nickel in an appropriate range;

　　⑶ Shorten the zinc immersion time as much as possible;

　　⑷ After being out of the pot, add water as soon as possible to cool down.

　　⑸ Purify the zinc liquid in time to ensure the quality of the zinc liquid.

　　http://www.xysteelpipe.com/info/Why-does-Hot-dip-Galvanized-Seamless-Steel-Pipe-Cause-Chromatic-Aberration-1987-1.htm

How to Carry Out the Pickling Process of Seamless Steel Tube？

 　　In the rolling process of seamless steel pipes, especially precision seamless steel pipes, the pickling process is very important to remove the oxide scale and rust on the surface. How is pickling performed?

　　The method of using acid solution to remove oxide scale and rust on the surface of steel is called pickling. Iron oxides such as scale and rust (Fe3O4, Fe2O3, FeO, etc.) react chemically with the acid solution to form salts that are dissolved in the acid solution and removed. Acids for pickling include sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid and mixed acids.

　　Commonly used media for pickling of precision seamless steel pipes:

　　Sulfuric acid, nitric acid, phosphoric acid, hydrofluoric acid. When pickling, be sure to add a pickling corrosion inhibitor to prevent the acid from corroding the metal.

　　Pickling process of precision seamless steel pipe:

　　There are mainly immersion pickling method, spray pickling method and acid paste derusting method. Generally, the dipping and pickling method is generally used, and the spray method can be used in mass production. Steel parts are generally pickled in a 10%-20% (volume) sulfuric acid solution at a temperature of 40°C. When the iron content in the solution exceeds 80g/L and ferrous sulfate exceeds 215g/L, the pickling solution should be replaced. At room temperature, the steel is pickled with 20% to 80% (volume) hydrochloric acid solution to prevent over-corrosion and hydrogen embrittlement. Since acid has a great corrosive effect on metals, corrosion inhibitors need to be added. After cleaning, the metal surface becomes silvery white, and at the same time, the surface is passivated to improve the corrosion resistance of stainless steel.

　　In order to eliminate the adsorption on the surface of the diatomaceous earth carrier and reduce the tailing of the chromatographic peak, the carrier needs to be acid washed or alkali washed before use. Pickling is to soak the carrier with 6mol/L hydrochloric acid for 2 hours or heat and soak with concentrated hydrochloric acid for 30 minutes, filter, wash with water to neutrality, and dry. Pickling can remove iron, aluminum, calcium, magnesium and other impurities on the surface, but cannot remove silanol groups. The pickling carrier is suitable for the analysis of acidic samples.

　　The role of precision seamless steel pipe pickling:

　　Degreasing and derusting the surface of precision seamless steel pipes to prepare for the next process. In the production process, the pickling process is to remove the surface oxide scale, and then go through lubrication treatment (carbon steel-phosphorous saponification, stainless steel-butter lime, copper aluminum pipe-oiling), using the old process-copper plating), and then For drawing and deep processing. If the steel pipe is not pickled, there may be oxides and oil stains on the surface, and the nuclear energy of the phosphating solution cannot remove them, and the quality of phosphating will be reduced.

　　http://www.xysteelpipe.com/info/How-to-Carry-Out-the-Pickling-Process-of-Seamless-Steel-Tube%EF%BC%9F-1984-1.htm

Scaffolding Safety Construction

 　　Safety is an important issue while erecting and dismantling the scaffolding, and it needs effective management. Today, we concluded the general principles of safety management of scaffolding as follows:

　　1) The installation and removal personnel of scaffolding must be qualified professional scaffolders. The scaffolder should work with qualified certification.

　　2) The scaffolder who erects and dismantles ringlock scaffolding must wear a safety helmet, safety belt, and non-slip shoes.

　　3) The quality of scaffold components and erection quality shall be inspected and accepted in accordance with the specification and shall be confirmed qualified for use.

　　4) Drilling on the steel pipe is strictly prohibited.

　　5) The construction load on the working floor shall meet the design requirements and shall not be overloaded. Formwork support, cable wind rope, pumping concrete and mortar conveying pipe, etc. shall not be fixed to the frame body. It is strictly prohibited to remove or move the safety protection facilities on the frame.

　　6) During the using of ringlock scaffolding, professionals should be arranged to monitor the construction. Construction shall be stopped when abnormal conditions occur. Personnel on the operating surface should be evacuated promptly. Safety measures should be taken to identify the cause, make a judgment and deal with it.

　　7) The actual load on the top of the ringlock scaffolding shall not exceed the design specification.

　　8) Scaffolding erection and removal should be stopped when there are strong winds, fog, rain or snow. After the rain or snow, anti-slip measures should be taken and the snow or water on the scaffolding should be cleaned.

　　9) Scaffolding construction and demolition operations should not be carried out at night.

　　10) Scaffolding safety inspection and maintenance shall be conducted in accordance with the relevant specifications.

　　11) Scaffolding planks should be laid solid, and the use of double safety netting. The safety netting shall be closed every 10 m below the construction floor.

　　12) Single-row and double-row scaffolds, cantilevered scaffolds shall be completely closed along the periphery of the wall with a dense mesh safety netting. The dense mesh safety netting shall be arranged on the inside of the pole outside the scaffold and shall be bound firmly with the frame.

　　13) During the use of scaffolding, it is strictly prohibited to remove the member bar:

　　14) When excavating the equipment or pipe trench under the scaffolding foundation during the use of the scaffolding, measures must be taken to reinforce the scaffolding.

　　15) The scaffold should be installed in the process of temporary measures to prevent overturning.

　　16) When the scaffold is erected in front of the street, protective measures should be taken outside to prevent falling objects from injuring people.

　　17) When conducting electric welding and gas welding on the scaffold, there should be fire prevention measures and specialized person to guard.

　　18) The erection of temporary power lines on the site, grounding of scaffolding and lightning protection measures shall be implemented in accordance with the relevant provisions of the construction industry construction standard “technical code for the safety of temporary power consumption on the construction site”.

　　19) When erecting and dismantling scaffolding, the ground should be set up the fence and warning signs and should be assigned to guard, strictly prohibited non-operators inside.

　　http://www.xysteelpipe.com/info/Scaffolding-Safety-Construction-1907-1.htm

Anticorrosion treatment method for inner and outer wall of seamless steel tube

 　　Compared with traditional pipes, seamless steel pipes have lighter raw materials, high strength, good durability, can withstand higher internal pressure, are sensitive in production and use, and can be used in messy or harsh geological conditions. However, there are disadvantages in the use process, mainly because the internal and external anti-corrosion treatment is more troublesome.

　　The first is the problem of outer wall anti-corrosion. The quality of outer wall anti-corrosion directly affects the service life. At present, the outer wall anti-corrosion of domestic steel pipes is mainly: concealed method, steel pipes are required to be reinforced or specially reinforced outer wall anti-corrosion, and cathodic protection is promoted in some areas. The common anti-corrosion methods for outer walls include coatings such as petroleum pitch and epoxy coal pitch. The latter is not easy to solidify at low temperatures, and there are many problems during field welding. In the past, chlorosulfonated polyethylene was used because of the large amount of solvents. , Prone to pinholes, unqualified resistance to breakdown, and no longer used in some areas. The anticorrosion effect of cathodic protection is better, but because the method of sacrificial anode is selected, the anode needs to be replaced regularly in the future operation, which increases the operating cost and operation.

　　There are three commonly used methods for the inner wall treatment of seamless steel pipes (astm a106 seamless): anti-corrosion paint, resin mortar, and cement mortar. But the three methods have two problems: one is the bond strength of the anti-corrosion layer and the steel pipe. Regarding the two methods of anti-corrosion coating and resin mortar, both the inner and outer walls of the steel pipe need to be derusted before construction, but this is difficult to achieve. Therefore, the rust spots will form the source of delamination in the future, which constitutes corrosion and scaling. The second is that most of the steel pipes are butt-welded on site, and anti-corrosion is performed after welding. It can only be done manually, and the quality is not easy to control. For steel pipes with small diameters, because personnel cannot enter the construction, they cannot perform anti-corrosion treatment, which also creates a hidden danger of future weld damage.

　　http://www.xysteelpipe.com/info/Anticorrosion-treatment-method-for-inner-and-outer-wall-of-seamless-steel-tube-1908-1.htm

Analysis of crack reason of seamless steel tube

 　　What are the main factors that cause seamless steel pipe cracking? There are mainly the following points:

　　1. Raw material selection

　　In order to save costs, some seamless steel pipe manufacturers will use round steel produced by small steel plants for processing, but the round steel produced by these small steel plants will contain many impurities, bubbles, interlayers, pores, etc., which will easily cause cracks after post-processing. problem.

　　2. Inadequate heat treatment temperature control

　　Small manufacturers do not have professional production experience and technology. Workshop workers cannot guarantee whether the heat treatment of the steel pipe is in place based on the heating temperature and duration alone, and the heat treatment will change the mechanical properties of the steel pipe. However, general manufacturers do not have clear indicators for different steel grades, wall thicknesses, mechanical properties, etc., and no testing equipment to determine whether the pipe has reached the performance indicators required by the customer.

　　3. Straightening strength

　　Straightening is equivalent to secondary deformation. Two-way force is applied during straightening. If the operator is not experienced enough, the straightening force is too strong, and the thick-walled pipe will cause internal damage and cracks if the strength of the thick-walled pipe is not well controlled. This is also the reason for the cracking of the steel pipe in the later stage.

　　4. Drawing deformation

　　If the drawing deformation is too large, steel pipe cracks will also be formed, causing the steel pipe to crack during the later processing. Bright tube has low elongation, generally 7-8%, large deformation, low elongation; small deformation, high elongation. Some small manufacturers cut corners and cut corners to save craftsmanship. The three deformations were changed to two, which expanded the deformation and caused excessive stress to cause cracking.

　　http://www.xysteelpipe.com/info/Analysis-of-crack-reason-of-seamless-steel-tube-1909-1.htm

Common problems and solutions of deburring electric welded pipes

 　　Common problems in the removal process of internal burrs include eccentric, deep, shallow, etc., which of them will affect the quality of weld detection and reduce the yield of welded pipes. In particular, the internal burr is deeply scraped and the wall thickness of the weld is up to If the requirements are not met, the bearing capacity is insufficient here. In severe cases, the welded pipe may burst. The methods for removing burrs in ERW welded pipes are generally divided into two types: online and offline. The on-line removal method is to use the inner burr trimming blade on the inner burr trolley on the traction rod to carry out, and use the relative movement of the tool to plan off the burrs.

　　1. Internal burrs shaved biased

　　When the internal burrs are shaved very biased, there will be steps on the inner wall of the welded pipe at the weld, and the online flaw detection of the weld will alarm and affect the weld quality of the welded pipe. The reason for the internal burr is that the internal burr on the drawbar is scraped from the internal burr on the trolley. The center line of the blade does not coincide with the center line of the burr in the welded pipe, resulting in deviation. Through the inspection of the welded pipe opening, it can be found that the internal burr removed is obviously scraped. The internal burr blade has scratched the base material. Check the position of the tow bar, adjust the position of the tow bar to ensure that the mechanical connection of the tow bar is good, so as to ensure that the tow bar will not shake during work, which will affect the quality of the internal burr. It is also necessary to check whether the internal burr trolley on the tow bar is Place it in the correct working position and check whether the blade screws on the inner burr trolley are loose.

　　2. Internal burr shaved deep

　　When the internal burr is scraped deeply, the wall thickness of the weld will not meet the requirements, resulting in insufficient pressure-bearing capacity, and in severe cases, the pipe may burst.

　　Through the inspection of the physical burr, it is found that the inner burr is too deep, and part of the substrate has been scraped off. When the inner burr blade is working, its working height is relatively high to the inner wall of the welded pipe. If the height of the inner burr blade does not meet the requirements, it will cause Deep inner burr scraping or shallow scraping, at this time, you need to adjust the working height of the inner burr blade to ensure that its height is within the standard range. In addition, check the fasteners on the inner burr trolley to ensure that they are tightly fitted to avoid Loose when working.

　　3. Shallow shaving of internal burrs

　　When the inner burr is shallow, it will cause the inner burr to protrude, which will seriously hinder the transportation of oil and gas. In addition, the inner burr will seriously affect the inspection quality of the weld. The fastening screw of the burr blade to ensure that it will not deviate from the correct working position due to uneven force during work, and the fixing seat of the traction rod needs to be checked to ensure that the traction rod will not be caused by looseness during work In the process of shaving internal burrs, the traction rod is not in the correct working position due to the force.

　　When the internal burr is shallow, since it can no longer be removed online, it needs to be removed offline by the internal burr removal device. After the offline internal burr removal is completed, offline inspection is required to ensure the quality of the weld. In addition, if the offline inspection is not Qualified, further manual inspection of the weld is required to ensure the quality of the weld and avoid the unqualified welded pipe due to the quality of the weld.

　　When removing internal burrs of ERW welded pipe(astm a53 erw), there are mainly problems such as offset, deep scraping, shallow scraping, etc. Each problem will affect the weld quality of the welded pipe. Therefore, in the production process of welded pipe, it is necessary to pay attention to removing the internal burr to ensure that it is removed. The subsequent internal burr meets the standard.

　　http://www.xysteelpipe.com/info/Common-problems-and-solutions-of-deburring-electric-welded-pipes-1983-1.htm