Longitudinal welded pipe has the advantages of simple production process， high production efficiency， and welded pipe with different pipe diameter with blank of the same width. However， compared with the straight seam pipe with the same length， the weld length increases by ~ ， and the production speed is low. Welded pipes with large or thick diameter are generally made of steel blank directly，Products Show while small welded pipes and thin-walled welded pipes only need to be welded directly through steel strip. Then after simple polishing，MatansasAlloy tube 40CrProduct Range wire drawing is OK. Welded pipe is welded with strip steel， so it is not as high as seamless pipe in its original position. Welded pipe process: uncoiling of raw materials - leveling - end shearing and welding - looper - forming - Welding - removal of internal and external weld beads - pre correction - induction heat treatment - sizing and straightening - eddy current testing - cutting - hydraulic inspection - Pickling - Inspection (strict control) - Packaging - delivery.
9The smooth of steel pipe is mainly through tension reducing which is a continuous rolling process of hollow base metal without center and tip. Under the condition of ensuring the capillary welding quality， the whole welded pipe is heated to more than ℃ by the welded pipe tension reduction process， and then rolled to finished pipes with various outer diameters and wall thicknesses by the tension reduction machine ( times in total). The fluid pipes produced by developed countries in the world have adopted the welded pipe smooth process in a large number of boiler pipes. With the development of society， Domestic hot welded pipe has gradually formed a situation to replace smooth pipe.
lShegord Avilad. All machines and equipment in a production line can connect with the software of the computer data collection system to complete the timely transmission of data information and the performance parameters in the production process are monitored by the central control room.
However， compared with plastics， these pipes， like other metals， remain stable and will not be affected by high temperature.
JIgorGalvanized pipe can be seen from its name. It is a square pipe type. Many materials can form galvanized pipe body. It is used for what purpose and where. Most galvanized pipes are steel pipes. After unpacking，Products Show crimping and welding， they form round pipes， which are rolled into square pipes， there are galvanized pipes in each package. In terms of spot， most of them are in large specifications， ranging from * * .- to * * - Galvanized pipes are divided into structural galvanized pipes， architectural galvanized pipes， mechanical galvanized pipes， etc.
Gm Quality requirements
Galvanized pipe refers to the shape and high frequency of hollow square steel pipe welded by the back of the steel pipe during the hot rolling or cold rolling of galvanized steel plate or cold bending of galvanized steel plate， or before the galvanization of cold hollow pipe. Galvanized. Galvanized square pipe can be divided into hot galvanized pipe and cold galvanized pipe from the production process. This is because the two galvanized pipes are different，Products Show which also leads to many different physical and chemical properties.
The whole structure is composed of zinc and quaternary crystals， forming dense crystals and barrier layer on the plate，MatansasAlloy tube 40CrProduct Range which effectively prevents the penetration of corrosion factors. From the point of view of the strong zinc corrosion resistance of the barrier layer， when the zinc sacrificial anode is at the forefront of protection， the scratches and scratches of some coatings and the insolubility of zinc oxide layer play a protective and blocking role.
fDefects of alloy pipe and solutions:
GDuring the construction of building wall， cracks and hollows show that the construction materials are unqualified， the construction at the matrix junction is not in place， and the construction personnel are poor. The external wall plastering adopts electric welding steel wire mesh， which can prevent cracking and strengthen the wall.
KmanufacturerThe 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，Reinforcement, galvanized pipe, seamless pipe, welded pipe, alloy pipe, I-beam-Shandong Kaiwen metal material Co., Ltd 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.
yZIdler 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.
Characteristics and application of galvanized pipe
The storage of galvanized pipes should pay attention to several points. The first is the storage location. It cannot be placed in the open air， because in the open air， not only the safety of various products such as theft but also corrosion problems will occur. Open air sites are vulnerable to various extreme weather conditions. Large amounts of rain or snow will erode the zinc coating on the surface to the greatest extent， which may lead to rust of the product. The second is the details of storage. It is not directly exposed to the sun. It shall be cooled and dried and shall not be stored with corrosive articles.
Marketing DepartmentgThere are five main guarantee measures for steel pipe welding. If these five aspects are guaranteed， the quality of galvanized pipe can also be guaranteed.
AI-beam: national standard * what is the wall thickness of I-beam
Galvanized pipe cleaning， east-west derusting， pickling and shot blasting
dShegord AvilaFilling: welded pipe is welded by electric welding of hot-rolled strip steel， so its influence was not as high as that of seamless steel pipe.
jYWelded thin-walled pipe: mainly used for making furniture toys， lamps， etc. In recent years， thin-walled tubes made of stainless steel strip are widely used， such as high furniture， decoration， fence and so on.
According to the pipe wall thickness， pipes made of relatively thin materials such as steel strip can be welded with high frequency， and some thin-walled pipes can be welded with shielding gas; Pipes with wall thickness more than mm can be welded by hand.