Welding drill pipes
Are you interested in welding drill pipes? Supplier Evek GmbH offers to buy drill pipe of domestic and foreign production at an affordable price in a wide range. We provide delivery of products to any point on the continent. The price is optimal.
Thick-walled stainless steel pipe
Stainless structural steel grades 10Х23Н18 and 20Х23Н18 (AISI 310S) have high strength and corrosion resistance. The content of titanium, chromium, nickel, gives pipes particular strength without loss of plasticity and allows their use in contact with solutions of acids, alkalis, their salts at temperatures up to +350 ° C.
Percentage composition 10Х23Н18 (GOST 5632−72)
| C | Si | Cu | Mn | P | Cr | Ti | S | Ni | Fe |
|---|---|---|---|---|---|---|---|---|---|
| ≤0,1 | ≤1 | ≤0,3 | ≤2 | ≤0,035 | 22−25 | ≤0,2 | ≤0,02 | 17−20 | basis |
Percent composition 20Х23Н18 (GOST 5632−72)
| C | Si | Cu | Mn | P | Cr | S | Ni | Fe |
|---|---|---|---|---|---|---|---|---|
| ≤02 | ≤1 | ≤0,3 | ≤2 | ≤0,035 | 22−25 | ≤0,02 | 17−20 | basis |
Thick-walled seamless pipes are used in construction, heat and power engineering, gas and oil production. Particularly thick-walled pipes are indispensable for drilling work.
Welding modes and methods
The problem is that under normal use the drill pipe acquires the properties of a permanent magnet. Strong magnetic fields at the ends cause the electric welding arc to spray, oscillate and become unstable, making it difficult to get a good weld. Therefore, the challenge is to remove or completely neutralize the strong magnetic fields. To do this, the principle of creating an electromagnet is used — wrapping an insulated wire around an iron core, after which the pipe can be welded.
Polarity and induced electromagnetic field
Polarity can also be neutralized in a similar way, the difference being that a pin is wrapped around the pipe. Wrapping clockwise will produce one polarity and counterclockwise will produce another. The intensity of the induced electromagnetic field will be affected by the current setting and the number of wire windings, around the drill pipe. Usually the current strength is set by the size of the rod, and technically it is easier to perform arc heating, so the easiest way to adjust the strength of the electromagnetic field is the number of turns of the wire. Once the root pass is complete, the wire can be removed and normal welding will resume.
Friction welding.
If it is impossible to use the above technique, friction welding of drill pipes on stationary units is used.
Buy. Supplier, price.
Are you interested in friction welding of drill pipes? Supplier Evek GmbH offers to buy drill pipe of domestic and foreign production at an affordable price in a wide range. Provide product delivery anywhere in the continent. Price is optimal. We invite you to partner cooperation.
