Precision light pipe welded butt joints before welding primer tube and the cavity should be filled with argon gas to perform TIG welding. In certain particular at low temperatures, the operation of fingerprint adhesion ranking officials will also impact the workpiece. Do not make the workpiece gets new oil. Wear clean gloves must operate. If the surface of the lubricating oil during cold adhesion must trichlorethylene degreasing agents, caustic soda solution and then with warm water to fully defatted.
While affirming the load, the higher the temperature and the longer the time angry creep to occur the greater. Design units are also based on environmental conditions, corrosion and corrosion tape required product characteristics were selected. Precision light pipe according to different cross-sectional shapes can be divided into tube and shaped tubes. Therefore, the operator should not directly touch the fertilizer tube fittings, in affirming the special temperature at low temperatures, the greater the load seamless tube made of fire creep occurs faster; ring with a steel pipe manufacturing parts, can improve the material utilization, and simplify the manufacturing process, saving material and machining time, such as bearing rings, steel pipe and solid steel bar, etc. compared to the same torsional strength in bending, lighter, precision light pipe is an economic cross-section steel , widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle frames and construction using steel scaffolding. Jack sets, has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel, etc. to make steel. Greater load creep occurs faster firing; under load in the affirmative, the higher the temperature and the longer the time angry creep can occur the greater.
Monday, September 16, 2013
Rectangular tube rectangular hole design
The need to produce several shaped tube, the use of strip dimensions and allow reunification (eg several fasting Gangchuang tube), only a set of forming rolls, and then in plastic rack (rack pipe sizing) on the roll change you can get different sections, so that the replacement of species is very simple, which can be a significant reduction in roll processing and reserves.
First forming a rectangular welded pipe production process consists of sizing stands complete molding, sizing mill is generally two-roll mill, which has horizontal racks and vertical roll racks. Currently rectangular hole design, there are two: one is horizontal rack at box-hole design, the first frame of oval holes, each frame of the other approximate rectangular holes, which pass by the arcs cross-section, and an arc Radius-by-frame increments, all pass phase at the sidewalls and bottom fillet radius equal to the product of the cross-section of the fillet radius. Rectangular tube total elongation factor of about 1.05, mainly distributed in the flat roller, a small amount of deformation of the vertical roll, which acts to hold down the short side of the rectangular tube. With this design, calculation is more complex, and the calculated value is not precise enough to be constantly revised hole perimeter. Another modification is the use of the design angle, from the tube can be viewed from a rectangular tube 90 ° to 180 ° to the bending deformation, the deformation angle θ corners accurately reflect the degree of deformation and edge. Design, considering the dimensional accuracy and hardening of the metal, usually deformation angle distribution, the beginning and bigger intermediate passes, and then gradually decreases. Intersecting arcs constitute the direct use of the pass, the tube can not be filled hole fillet portion, so pass tube circumference and perimeter range. In order to ensure dimensional accuracy, the need for correction calculation pass fillet portions. So this method than other methods with higher design accuracy. However, due to the large amount of iteration calculation, this method is more suitable for use computers pass design. If you use the horizontal and vertical directions simultaneously deformed universal rack deformation angle θ can be directly used for pass design.
First forming a rectangular welded pipe production process consists of sizing stands complete molding, sizing mill is generally two-roll mill, which has horizontal racks and vertical roll racks. Currently rectangular hole design, there are two: one is horizontal rack at box-hole design, the first frame of oval holes, each frame of the other approximate rectangular holes, which pass by the arcs cross-section, and an arc Radius-by-frame increments, all pass phase at the sidewalls and bottom fillet radius equal to the product of the cross-section of the fillet radius. Rectangular tube total elongation factor of about 1.05, mainly distributed in the flat roller, a small amount of deformation of the vertical roll, which acts to hold down the short side of the rectangular tube. With this design, calculation is more complex, and the calculated value is not precise enough to be constantly revised hole perimeter. Another modification is the use of the design angle, from the tube can be viewed from a rectangular tube 90 ° to 180 ° to the bending deformation, the deformation angle θ corners accurately reflect the degree of deformation and edge. Design, considering the dimensional accuracy and hardening of the metal, usually deformation angle distribution, the beginning and bigger intermediate passes, and then gradually decreases. Intersecting arcs constitute the direct use of the pass, the tube can not be filled hole fillet portion, so pass tube circumference and perimeter range. In order to ensure dimensional accuracy, the need for correction calculation pass fillet portions. So this method than other methods with higher design accuracy. However, due to the large amount of iteration calculation, this method is more suitable for use computers pass design. If you use the horizontal and vertical directions simultaneously deformed universal rack deformation angle θ can be directly used for pass design.
Thursday, September 12, 2013
Steel casing is buried technology
Steel casing (steel jacket) embedded technology is a waterproof, leakproof, impermeability, compressive and fully enclosed laying of new technology, is burying technology used in areas with high water table, a large-break. It is composed of the transmission medium pipe, seamless carbon steel pipe and steel pipe and anticorrosion coat jacket filled with fine steel wool between the combination can also be used graphite, calcium silicate tiles shell filled with polyurethane foam and composite.
One is by the transmission medium steel pipe, steel pipe and anticorrosion coat jacket filled with fine steel wool between the combination can also be used graphite, calcium silicate tiles shell filled with polyurethane foam and composite. Steel casing (steel jacket) embedded technology is a waterproof, leakproof, impermeability, compressive and fully enclosed laying of new technology, is burying technology used in areas with high water table, a large-break. Protective tube buried pipe water tight primary problem is the reliability, in addition to have a good mechanical strength, high strength steel casing as welded connections, the waterproof reliability is very high sealing performance, in addition, its high temperature performance is other outer protection tube can not be compared. In areas with high groundwater level, in order to ensure groundwater does not affect the normal operation of the steam buried pipe, outer protective layer is preferably made of sturdy, sealed steel casing.
One is by the transmission medium steel pipe, steel pipe and anticorrosion coat jacket filled with fine steel wool between the combination can also be used graphite, calcium silicate tiles shell filled with polyurethane foam and composite. Steel casing (steel jacket) embedded technology is a waterproof, leakproof, impermeability, compressive and fully enclosed laying of new technology, is burying technology used in areas with high water table, a large-break. Protective tube buried pipe water tight primary problem is the reliability, in addition to have a good mechanical strength, high strength steel casing as welded connections, the waterproof reliability is very high sealing performance, in addition, its high temperature performance is other outer protection tube can not be compared. In areas with high groundwater level, in order to ensure groundwater does not affect the normal operation of the steam buried pipe, outer protective layer is preferably made of sturdy, sealed steel casing.
Wednesday, September 11, 2013
Spiral welded pipe measures to prevent electrochemical corrosion
To prevent scratches and pollutants generated during construction under the state attached to stainless steel foil construction. (SSAW), but with time the residual liquid paste period of use in accordance with foil construction should be carried out after removing the surface film washing and use special stainless steel cleaning tool with the general public in order to prevent iron adhesion tools should be cleaned. It should be taken not to have strong magnetic and stone luxury corrosive cleaning stainless steel surfaces come into contact with drugs if the contact should be immediately washed. After the construction of the building application neutral detergent and water, dried attached to the surface of cement, ash until the matter.
TIG welded stainless steel pipe generally used two kinds of TIG arc welding or required for the protection of argon welding operation, which is simple and good quality. Arc welding should be used the same type of stainless steel electrode stainless steel electrode welding current according to manufacturer's recommended current supply and demand can also be negotiated. After welding the weld preferably be polished surface quality of the pipe so that all the same conditions if the surface can also be passivated to enhance the corrosion resistance of the weld. Spiral pipe production line of high-quality engineering, installation pipeline is the most basic requirement of the port tube flush.
Spiral welded pipe Handle with care when transporting the oil to avoid and prohibit non-violent impact collision with sharp objects and throw, throw, roll, drag; pipe should be placed to avoid bending the average weight of water. Stainless steel piping to be connected with galvanized steel pipe need to be scratching their heads with retractable teeth, add copper fittings transition to avoid electrochemical corrosion. Use of the environment as far as possible dry.
TIG welded stainless steel pipe generally used two kinds of TIG arc welding or required for the protection of argon welding operation, which is simple and good quality. Arc welding should be used the same type of stainless steel electrode stainless steel electrode welding current according to manufacturer's recommended current supply and demand can also be negotiated. After welding the weld preferably be polished surface quality of the pipe so that all the same conditions if the surface can also be passivated to enhance the corrosion resistance of the weld. Spiral pipe production line of high-quality engineering, installation pipeline is the most basic requirement of the port tube flush.
Spiral welded pipe Handle with care when transporting the oil to avoid and prohibit non-violent impact collision with sharp objects and throw, throw, roll, drag; pipe should be placed to avoid bending the average weight of water. Stainless steel piping to be connected with galvanized steel pipe need to be scratching their heads with retractable teeth, add copper fittings transition to avoid electrochemical corrosion. Use of the environment as far as possible dry.
Monday, September 9, 2013
Tension reducing the difference between steel pipe and Longitudinal Process
Different processes have formed a production quality differences, reducing tension in welded steel pipe also stopped a straight seam welded pipe Friends of the process is not stopped: online eliminate internal and external burrs. The existence glitch affects tube fluid - flow, glitches obstruct the normal activities of the fluid, resulting whirlpool. Based on principles of fluid dynamics, weld some pressure must increase, the average discontinuity of the Friends of the pipe safety factor is also greatly reduced, stretch reducing pipe processing technology to fully reflect on the existence of the risk of glitches, stop burr elimination, making it an average wall thickness, seamless appearance with no difference.
Resolution of the weld quality is directly YHI pipe quality, but also where the biggest difference between pipe and seamless. Friends of straight seam welded pipe at high frequency welding or submerged arc welding, the carbon can not be set straight seam eliminate the weld interface in conjunction with the parent only, and not a complete blend of one, could not stand the test of time and pressure. Tension Reducing heat welded steel pipe in the pipe even after high temperature of about 800 degrees after heating, the overall annealing, after this series of processes, the weld performance close to the parent organization, well done seamlessly from seam to transition. So from this point of view, hot stretch reducing pipe joints from having also completed a seamless transition, of course, the distinction between the two is not only limited to the above two points, but enough to clarify YHI straight seam welded pipe and tension reducing pipe there are still significant differences. Longitudinal bedrock on the latter has ceased online eliminate burrs inside and outside, the overall heating type variable and a series of new technologies disposal, so that it has been a qualitative leap in the high-pressure areas can be commonly applied, straight seam Friends fat pipe used in low pressure environment of ordinary water gas walks or for steel construction.
Resolution of the weld quality is directly YHI pipe quality, but also where the biggest difference between pipe and seamless. Friends of straight seam welded pipe at high frequency welding or submerged arc welding, the carbon can not be set straight seam eliminate the weld interface in conjunction with the parent only, and not a complete blend of one, could not stand the test of time and pressure. Tension Reducing heat welded steel pipe in the pipe even after high temperature of about 800 degrees after heating, the overall annealing, after this series of processes, the weld performance close to the parent organization, well done seamlessly from seam to transition. So from this point of view, hot stretch reducing pipe joints from having also completed a seamless transition, of course, the distinction between the two is not only limited to the above two points, but enough to clarify YHI straight seam welded pipe and tension reducing pipe there are still significant differences. Longitudinal bedrock on the latter has ceased online eliminate burrs inside and outside, the overall heating type variable and a series of new technologies disposal, so that it has been a qualitative leap in the high-pressure areas can be commonly applied, straight seam Friends fat pipe used in low pressure environment of ordinary water gas walks or for steel construction.
ERW carbon steel pipe hardness testing
Hardness is the assessment of mechanical properties of metallic materials most commonly used indicators. The hardness of the material to resist another real ability to push harder material. Hardness testing was to evaluate the mechanical properties of metals fastest, most economical and simplest test methods. The main purpose of hardness testing is to measure the suitability of materials, or materials for the use of the particular purpose for hardening or softening effect. For the test materials, the hardness represents a certain pressure force of the head and the reflected test the flexibility, ductility, strength, toughness and wear resistance and other physical quantity of the overall performance. As can be reflected through the ERW carbon steel pipe hardness test on a different chemical composition, structure and properties of the heat treatment process conditions vary, it is widely used in ERW carbon steel pipe hardness testing performance testing, monitoring heat treatment process quality and new materials research.
There are two types of ERW carbon steel pipe hardness testing test methods. One is a static test method, test force is applied such methods are slow and no shocks. Determination of hardness mainly on the depth of the indentation, the indentation or indentations gravure projection area size of the area. Static test methods include Brinell, Rockwell, Vickers, Knoop, Vickers, pasteurized and so on. Including cloth, Luo, Victoria three test methods are the most widely used, they are the main ERW carbon steel pipe hardness testing test methods. Here Rockwell hardness test is the most widely used, it is widely used for product testing, according to statistics, the current application of the 70% hardness Rockwell hardness. Another test method is a dynamic test method, test force is applied such methods are dynamic and impact resistance. This includes Shaw and Leeb hardness test method. Dynamic test method is mainly used for large-scale, non-removable workpiece hardness testing.
There are two types of ERW carbon steel pipe hardness testing test methods. One is a static test method, test force is applied such methods are slow and no shocks. Determination of hardness mainly on the depth of the indentation, the indentation or indentations gravure projection area size of the area. Static test methods include Brinell, Rockwell, Vickers, Knoop, Vickers, pasteurized and so on. Including cloth, Luo, Victoria three test methods are the most widely used, they are the main ERW carbon steel pipe hardness testing test methods. Here Rockwell hardness test is the most widely used, it is widely used for product testing, according to statistics, the current application of the 70% hardness Rockwell hardness. Another test method is a dynamic test method, test force is applied such methods are dynamic and impact resistance. This includes Shaw and Leeb hardness test method. Dynamic test method is mainly used for large-scale, non-removable workpiece hardness testing.
Monday, August 26, 2013
Spiral seam welded pipe hydrostatic burst test
Spiral seam welded pipe hydrostatic burst test is a destructive test, tube sheet through the entire plate surface ultrasonic flaw inspection, pipe weld inspection by X-ray inspection, hydrostatic testing, ultrasonic flaw detection, thickness and tensile performance test after passing to qualified steel pipe as a burst test. For critical oil and gas pipelines with spiral seam welded pipe, in the technical standard book require manufacturers to do hydrostatic pipe burst test, and provide a burst test report.
Blasting field locations should be selected in the absence of personnel and motor vehicles have passed a safe place; when set in the underground or semi-underground, blasting tests when they set up warning signs to prevent persons and motor vehicles. The device consists of blasting proving ground burst test units, feed pump, high-pressure injection pump, electric control box, computer control systems, pressure sensors, temperature sensors and other components. 4m from the bursting pipe installed at both ends of electronic cameras, surveillance blast scene, you can see through the monitor screen blasting process.
By burst test, to verify product performance and process reasonable. Burst pressure and other relevant data for the design of units and users to provide reference; pipe manufacturers through experimental analysis to find areas of improvement to help improve product quality. Spiral seam welded pipe burst test device. Spiral seam welded pipe manufacturers should have burst Proving Ground, generally divided into temporary and permanent blasting blasting Proving Ground Proving Ground.
Blasting field locations should be selected in the absence of personnel and motor vehicles have passed a safe place; when set in the underground or semi-underground, blasting tests when they set up warning signs to prevent persons and motor vehicles. The device consists of blasting proving ground burst test units, feed pump, high-pressure injection pump, electric control box, computer control systems, pressure sensors, temperature sensors and other components. 4m from the bursting pipe installed at both ends of electronic cameras, surveillance blast scene, you can see through the monitor screen blasting process.
By burst test, to verify product performance and process reasonable. Burst pressure and other relevant data for the design of units and users to provide reference; pipe manufacturers through experimental analysis to find areas of improvement to help improve product quality. Spiral seam welded pipe burst test device. Spiral seam welded pipe manufacturers should have burst Proving Ground, generally divided into temporary and permanent blasting blasting Proving Ground Proving Ground.
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