Classification by use
5The fourth is the welding process method to ensure the strict implementation of the special operation method of galvanized pipe. The welding process includes pre welding groove inspection， control of welding process parameters and operation methods， post welding appearance quality inspection， and post welding nondestructive testing if necessary. Control the welding level and the amount of welding materials at each crossing.
vPentichtonI-beam features: the content of chromium carbon alloy is -%， the hardness of chromium carbide alloy is V， and the macro hardness is - HRC
The fourth is the welding process method to ensure the strict implementation of the special operation method of galvanized pipe. The welding process includes pre welding groove inspection，Products Show control of welding process parameters and operation methods，ويلاندdn50 المجلفن الأنابيبكيفية تحقيق post welding appearance quality inspection， and post welding nondestructive testing if necessary. Control the welding level and the amount of welding materials at each crossing.
TCurva According to the process， it is divided into arc welded pipe， resistance welded pipe (high frequency and low frequency)， the quality of galvanized pipe can also be guaranteed.
If the steel pipe is not welded well， that is， if it is not welded， the welding conditions of steel mesh skeleton composite pipe shall be provided.
j→ I-beam can be processed into T-beam， and honeycomb beam can be combined to form various section forms，Products Show which greatly meets the needs of engineering design and manufacturing.
TIdler pipe: it is used for electric welding steel pipe of idler of belt conveyor. It is generally made of Q， QA， B steel and steel， with a diameter of -mm. There are certain requirements for pipe tortuosity， end face straightness with the center line and ovality. Generally water pressure and flattening tests are carried out.
VmanufacturerCharacteristics and application of galvanized pipe
wUCheck whether the manufacturers qualification， business license， organization code certificate， tax registration certificate， production and operation license and other qualification materials are complete. Look at the case， investigate the suppliers performance and the projects served in the past. Whether there is a self built logistics fleet or not，Products Show choosing a service provider with a self built logistics fleet can reduce the transportation cost， and more importantly，ويلاندdn50 المجلفن الأنابيبكيفية تحقيق ensure the timeliness of delivery. After sales service， whether there is a sound and reliable after-sales service guarantee system， and timely solve quality problems in arrival acceptance and subsequent use. Check whether the quality assurance materials such as product quality certificate， material specification and warranty are complete. Check the appearance of the welded pipe， the surface is smooth and flat the weld is dense， without burr， oil stain， corrosion，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd extrusion deformation and flat cross section. Use a micrometer to check whether the outer diameter and wall thickness of the welded pipe meet the requirements， and the standard wall thickness deviation shall not exceed % - %. NDT shall be carried out for welded pipe with flaw detector. Conduct bending tensile strength test according to the requirements， bend the welded pipe for degrees， with chemical composition content of C carbon .%， Si silicon .%， Mn manganese %， s sulfur ≤ .%， P phosphorus ≤ .%， yield strength of mpa and tensile strength of MPa. High temperature continuous casting and rolling or ingot heating rolling. Soft， good weldability， high ductility， because the initial temperature of the surface layer is lower than that of the heart and the shrinkage is greater than that of the heart， the heart is pulled. At the end of cooling， because the final cooling volume shrinkage of the heart cannot be carried out freely， the surface layer is compressed and the heart is pulled. That is， under the action of thermal stress， the surface of the workpiece is finally compressed and the center is pulled. This phenomenon is affected by factors such as cooling rate， material composition and heat treatment process. The faster the cooling rate the higher the carbon content and alloy composition， the greater the uneven plastic deformation caused by thermal stress during cooling， and the greater the final residual stress. On the other hand， i.e. the transformation from austenite to martensite， the increase of specific volume will be accompanied by the expansion of workpiece volume， and each part of workpiece will undergo phase transformation successively， resulting in inconsistent volume growth and structural stress. The final result of the change of tissue stress is the tensile stress on the surface and the compressive stress in the center， which is just opposite to the thermal stress. The microstructure stress is related to the cooling rate， shape and chemical composition of the workpiece in the martensitic transformation zone.
Hardness of reinforcement construction of reinforced mesh on concrete bridge deck; Including key lime mixing and packaging materials， you need to pay attention to calculating the size of the building， and the calculated specifications must meet the quality standards and construction standards.
dPentichtonIn addition to these， the advantages of galvanized pipe are also reflected in some other aspects. For example， its reliability is also very good. Because the combination of zinc coating and steel is good news for metallurgy， it has become a part of galvanized steel pipe on the steel surface. In this way， this structure can withstand mechanical damage during transportation and use. When in use it also has the advantages of multiple protection. Because every part of the product can be plated with zinc， even in depressions， sharp corners and hidden places can be protected in many ways. It is very convenient during construction. It really saves time and effort. It is because of so many advantages that the utilization rate of this product is very high. And it can avoid the time required for painting on the site after installation. If you want to purchase on your occasion remember to go to the manufacturer， so that the price will be more favorable.
tIExternal steel bonding reinforcement method is a more traditional reinforcement method. The utility model uses an adhesive to paste the steel plate or reinforcement mesh on the cracked part of the wall to achieve the purpose of reinforcement. The commonly used adhesive is usually epoxy resin. This method is simple and fast in construction and has little impact on production and life. Basically， the bearing capacity of the wall can be greatly improved without changing the shape and internal use space of the components. It is mainly applicable to the reinforcement of walls that do not allow to increase the section size of original components， but can greatly increase the section bearing capacity.
Galvanized pipe is a kind of light thin-walled steel pipe with hollow square section， also known as steel cold-formed profile. It is a section steel with square section shape and size， which is made of Q hot-rolled or cold-rolled strip or coil as the base material， cold bending and high-frequency welding. In addition to wall thickness thickening， the corner size and edge flatness of hot rolled extra thick wall galvanized pipe reach or even exceed the level of resistance welding cold formed galvanized pipe. Good comprehensive mechanical properties， weldability， cold and hot workability and corrosion resistance， and good low temperature toughness.