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Q345B welded pExtend the length of the part: 566, divide it into 24 equal parts, symmetrical, and the length of each bisector from the middle to the side is: 11 110 106 10 93 84 75 66 57 0, 50 44 40 39 2.
The longitudinal weld of the same barrel part of the coiled pipe shall not be greater than 2.
.With the increase of arc length, the range is expanded, the weld pool is widened, and a wider weld formation will be obtained. If welding is carried out in a horizontal position, only the width of the weld will change without affecting the edge of the weld. Over external welding is carried out on a slope, and the molten weld metal will flow laterally under the action of gravity. It can be seen that the greater the welding voltage and the wider the weld pool, the more serious the weld metal will develop, * and eventually lead to the bias current of weld metal.
Let me introduce the standard coil produced by steel plate. In the process of rolling, the surface of the circuit board should be protected from damage. Parts with severe scars shall be ground to achieve transition, and the wall thickness of the ground part shall not be less than the design wall thickness.
.In the process we mentioned, we need to explain each process, such as groove. We need to compact both sides of the steel plate with indenter, so as to avoid the formation of peach shaped mouth in the rolling pipe.
Pipe rolling is to form the steel pipe blank with a steel plate rolling machine, then weld it into steel pipe with submerged arc welding or electric welding, and then conduct sizing and forming on other forming equipment. This kind of pipe is single piece production with low efficiency, unstable pipe quality and low dimensional accuracy, good quality, welding and forming. The production process of general thick walled coiled pipe can be divided into cold drawing and hot rolling. The production process of cold rolled seamless steel pipe is generally more complex than hot rolling. Roll sizing test shall be carried out for pipe blank first. If there is no response crack on the surface, the round pipe shall be cut by cutting machine, Cut into blanks about meters in length. However,45# large diameter reel, when entering the annealing process, acid shall be used for annealing, and attention shall be paid to whether a large number of bubbles are generated on the surface. If a large number of bubbles are generated, it indicates that the quality of steel pipe can not meet the response standard. In appearance, the cold-rolled seamless steel pipe is shorter than the hot-rolled seamless steel pipe, and its wall thickness is generally smaller than that of the hot-rolled seamless steel pipe, but the surface is brighter than that of the thick wall seamless steel pipe. There is not too much roughness on the surface, and there are not too many burrs in the diameter. The thick wall coiled pipe is a powerful manufacturer, honest operation, genuine and of the same quality. The thick wall coiled pipe is available from stock, with complete specifications. Docking and strengthening. Coil pipe processing time is short and delivery is fast Low cost. The rolling pipe is mainly used for pipes, billboards, columns, etc.
It is to preheat rather than increase the line energy. Reel needs quality, honest business! Let's talk about our productivity.
Welded pipe: welded pipe. Definition of welded pipe: pipe with specified shape and size of steel strip
It should be noted that in practice, it is difficult to achieve the ideal proportion of metal sand and metal ball in the rinsing agent, because the hard and brittle metal sand has a higher crushing rate than the metal ball. For this reason, the mixture should be sampled continuously and the mixed rinse should be tested. According to the particle size distribution, the new rinse agent is added to the cleaning machine, and the amount of metal sand is usually the same in the new rinse agent.
For more,16Mn large diameter welded pipe, please check.The process of heating the whole thick wall coil or welding area before welding is called preheating. For the steel with high welding strength grade, it has hardening trend, material, especially good thermal conductivity,Q550b welded pipe, weldment and large thickness. When the ambient temperature around the welding area is too low, it is necessary to preheat the weldment before welding.
Extend the length of the part: 566, symmetrical, and the length of each bisector from the middle to the side is: 11 110 106 10 93 84 75 66 57 0, 50 44 40 39 2.
It is to preheat rather than increase the line energy. Reel needs quality, honest business! Let's talk about our productivity.
Hot rolled steel pipe is a kind of thick wall steel pipe rolled under the condition of heating the steel plate.
Inspection environment.Weld inspection is necessary to detect the weld quality of steel coil pipe. After welding, all the welds are tested by on-line continuous ultrasonic automatic flaw detector to ensure the NDT coverage of the welds. If there are defects, it will automatically alarm and spray marks, and the production will adjust the process parameters at any time to eliminate the defects in time.
Thick wall coil production process thick wall coil production process can be divided into cold drawing, hot rolling and hot expansion.
Deviation reel as follows (unit: mm): nominal diameter & amp; amp; lt; 800 800 to 1200 1300 to 1600 1700 to 2400 2600 to 3000 perimeter Deviation & plusmn; 5± 7± 9± 11± The ovality is 1% of the outer diameter, and the quality of no more than 4 steel plate coils is greatly affected by the weld size, mainly including the comprehensive factors such as welding process parameters, welding wire shape and position parameters, flux flow, flux process performance and formed joint.
.Service specification of coiled steel pipe: there are spiral welded pipe and seamless pipe and the pressure resistance of gas and water is different.
Application of hot rolled steel pipe: the disadvantage of changing hot rolled steel pipe into seamless steel pipe with fixed specification and model is another major feature of hot rolled steel pipe. In the production process, hot rolled steel pipe has been widely used, especially in large equipment such as oil cylinder production bridge construction, engineering column, large drum and so on. Save materials and labor for the above enterprises, reduce production costs improve the market competitiveness of finished products, and promote the development of enterprises to a certain extent. Continuous pipe is committed to producing all kinds of circumferential seam, longitudinal circumferential continuous pipe and penstock, and is reformed on the basis of the same specification and model of traditional pipe rolling equipment. The function of parameters of pipe rolling equipment is improved by 30%, which fills the gap that can not be produced by traditional steel rolling equipment. It can produce steel pipes with diameter of more than 400 and wall thickness of 8-100mm.
The longitudinal weld of the same barrel part of the coiled pipe shall not be greater than 2.