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天津市北辰区中关村可信产业园B9-1 Address: B9-1, Trustworthy Industrial Park, Zhongguancun, Beichen District, Tianjin

15522233345 Mobile: 15522233345

许宗涛 Contact: Xu Zongtao

Seamless steel pipe 5




1 Causes of Residual Magnetism and Its Impact on Welding Quality (Mass)
When constructing and repairing gas pipelines for welding operations, there are
There will be a phenomenon that the magnetic bias blow affects the welding process. GB6479 seamless steel pipe is mainly used for the production of pneumatic or hydraulic components, such as cylinders or oil cylinders, are used seamless pipes. The chemical composition of precision seamless steel pipe includes carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, and chromium Cr. Magnetically biased
Formation is the result of the presence of residual magnetism in the tube metal. Usually, the residual magnetic
There are two types of induction magnetism and technology magnetism. Inductive magnetism often occurs in
In the process of making pipes in the factory, such as: metal melting, electromagnetic lifting
Machine for loading and unloading, steel pipe stopped in strong magnetic field, completed by magnetization method
Non-destructive inspections, placement of steel pipes close to powerful power lines, etc. Technology
Property often occurs during assembly welding operations and the use of magnetic clamping
Devices, fixtures, and pipes welded with DC, such as: prolonged contact
Electrical wires connected to a DC power supply, bare wires or welding
Short circuit between clamp and pipe.
When welding magnetic steel pipes, arc ignition is often seen.
Difficulty, arc burning stability (explanation: stable and stable; no change), the stability of the destruction of the arc
Splashes of ion, liquid metal and slag melt from the weld pool.
In order to stabilize the welding process and improve the quality of the welded joints, the magnetic
The welded steel pipe should be demagnetized before welding. GB9948 seamless steel pipe is divided into high pressure seamless steel pipe for fertilizer equipment according to the purpose; seamless steel pipe for geological brick exploration; seamless steel pipe for petroleum brick exploration; seamless steel pipe for petroleum cracking; seamless steel pipe for ships; cold drawn cold rolled precision Seamless steel pipes; various alloy pipes. It should be noted that being welded
It is difficult to achieve complete demagnetization of the connected steel pipe. So when remanence
When it does not affect the welding quality, welding is allowed.
2 Degaussing method of Russian pipeline (Conduit) welding
Conduit welding and field welding in field conditions (tiáo jiàn) or semi-finished products
Demagnetization is particularly required during repairs. Developed by the relevant Russian authorities
The corresponding Conduit degaussing technology file GB6479 seamless steel pipe has the advantages of no oxide layer on the inner and outer walls of the precision seamless steel pipe, high pressure without leakage, high accuracy, high smoothness, no deformation during cold bending, flaring, no cracking and so on.
Advanced experience at home and abroad for similar operations.
2.1 Degaussing process (process)
Developed single steel pipe and steel pipe for demagnetization before welding
The degaussing process at the splice butt includes the following website content:
① Determine the remaining steel pipe
The size and direction of the magnetic field (definition: the field that transmits the magnetic force between objects);
② Select method, system and
Technology (Technology) means;
选定 Use the selected demagnetization method (method) on the steel pipe or welding
Degauss at the splice butt;
④ Check the amount of residual magnetization after demagnetization
Does it meet the requirements.



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General Manager: Xu Zongtao Phone: 15522233345 Address: B9-1, Trustworthy Industrial Park, Zhongguancun, Beichen District, Tianjin
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