According to the purpose， the welded pipe has general purpose and high temperature and high pressure. The pipe used in the latter is often special alloy steel. The problem of shrinkage cracks in the welding process and the mechanical properties of the pipe in the heat affected zone must be considered and solved， and the mechanical properties of the pipe in the heat affected zone will not be greatly changed due to the influence of welding operation.
6The multi-al combination of reinforcement mesh welding machine and reinforcement mesh row welding machine based on PLC basic control. At present， the full-automatic mesh welding machine has the characteristics of simple operation， high control precision and easy to master the process of high-speed continuous welding.
hAnkrajThe shape of small longitudinal crack on the surface of alloy pipe is less than mm The overall width is less than mm The depth is lower than .mm.
It is the trend of the development of steel bar industry to take the road of steel bar welding mesh in steel bar construction.
TBasseDuring the heating and cooling process of structural welded pipe workpiece， due to the inconsistent cooling speed and time of surface layer and core layer，Products Show the temperature difference will be formed，Pittsburgh15CrMo thick wall alloy pipeComparativeysis of repair process resulting in uneven volume expansion and contraction， resulting in stress， namely thermal stress. Under the action of thermal stress， and the shrinkage is greater than that of the core layer， making the core layer stretch. At the end of cooling，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd the surface layer is compressed and the core is stretched because the cooling volume contraction of the core cannot be carried out freely. That is， under the action of thermal stress， the surface of the workpiece is compressed and the core is pulled.
Sz General carbon steel wire sleeve (GB / t- is a steel pipe used to protect wires in electrical installation projects such as industrial and civil buildings and installation of machinery and equipment.
Are there many welded types of mesh produced? According to the welding type and overall improvement， the difference between the reinforcement mesh and the welded mesh is not particularly large. It is still due to the scattered quality of the southern city. From the perspective of development to the longitudinal and transverse interleaving devices of the reinforcement mesh， the bound or welded mesh has better application quality.
Multi channel cold rolling (cold rolling) process. Cold rolling of steel pipe is carried out on multi roll mill. Stainless steel pipes are rolled with round holes composed of variable cross-section circular grooves and fixed taper.
mThe import and export order of I-beam is generally based on the specifications required in use after determining the corresponding carbon structure steel (or low alloy steel) steel grade. Except for the specification number， pickling will be selected. Pickling of galvanized pipe is divided into chemical and electrolytic. How to prevent white rust of galvanized seamless steel pipe? It has a certain anti-corrosion effect on the pipeline.
bQDuring the heating and cooling process of structural welded pipe workpiece，Products Show due to the inconsistent cooling speed and time of surface layer and core layer the temperature difference will be formed， resulting in uneven volume expansion and contraction， resulting in stress， namely thermal stress. Under the action of thermal stress the starting temperature of the surface layer is lower than that of the core layer，Pittsburgh15CrMo thick wall alloy pipeComparativeysis of repair process and the shrinkage is greater than that of the core layer， making the core layer stretch. At the end of cooling， the surface layer is compressed and the core is stretched because the cooling volume contraction of the core cannot be carried out freely. That is， under the action of thermal stress，Products Show the surface of the workpiece is compressed and the core is pulled.
The correct and reasonable use of galvanized pipe can play a better role. The product can be widely used in the market because of its obvious performance advantages. Both strength and toughness are worth our choice. Lets see what the specific uses are and what the acceptance standards are?
Galvanized pipe features:
Latest consultationjSteel transfers heat excellently; Can withstand high temperature; Strong and strong materials; Probably a long time ago. In addition， there is the low cost of metal.
ZThe key purpose of grinding and polishing alloy pipe is to moisten the surface， and the relevant limit accuracy or appearance change is not easy to change.
Seamless pipe production process
bAnkrajWire sleeve: it is also a general carbon steel welded steel pipe. It is used in concrete and various structural power distribution projects. The commonly used nominal diameter is from -mm. The wall of wire sleeve is thin， which is mostly used after coating or galvanizing， and cold bending test is required.
qRA major defect is its instability to the corrosion process， which can not resist all factors. Producers need a solution that can solve the corrosion problem. The decision has been found. They become a galvanized steel pipe.
If the surface of the welded pipe is rusty， we can polish the appearance of the welded pipe with a wire brush to prevent rust.