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Ssaw Steel Pipe

Notice of oxyfuel and plasma cutting for making steel pipe

Oxyfuel and plasma cutting play an important role during the production process of making welded steel pipe like ERW steel pipe. And forgetting to grind the joint after oxyfuel or plasma cutting would be an common mistake for a new welder.

 

Today, we can make it alone to make an essay to tell all of us who need to choose steel pipes or producing tubes. Adding a layer of oxide to the cut edge during the oxyfuel and plasma cutting processes would be the necessary step for steel pipe. And here are the notices:

First of all, the oxide layer has to be removed prior to welding due to the higher melting point of oxide than base metal.

What’s more, the oxides can also remain in the weld and cause porosity, inclusions, lack of fusion and other defects.

In addition, welders have to keep in mind to grind the joint down to the parent material prior to welding, as well as grind the inside and outside diameters of the pipe to remove these oxides and other potential contaminants.

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Application Of Drill Pipe Thread For Spiral Steel Pipe

by permanent2 months ago

In the production process, the thread of the drill pipe of the spiral steel pipe is used to check the tightness of the thread according to the API standard. The pitch and taper are detected by the single thread detector of the drill thread according to a certain inspection cycle.

Use the on-site worn thread to check the wear of the thread with a dental profile. The remaining crest width is not less than 1/2 of the original crest width, and the remaining crest height is not lower than the original crest height 2/ 3. When the number of worn teeth does not exceed 3.5 teeth, the thread can still be used continuously, otherwise it should be repaired.

The most effective way to identify the thread of a spiral steel pipe is to use a joint ruler. This ruler is a vernier caliper with a diameter of the root of the external thread and the diameter of the taper hole of the internal thread. It is simple, intuitive and accurate. In addition, you can also directly use the long-foot vernier caliper c

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How Are Thin-walled Spiral Tubes Classified?

The spiral tube is divided into two types: hot rolling and cold rolling (dial) spiral tubes. Hot-rolled spiral pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes.

Cold-rolled (dial) spiral pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, other steel pipes, and also includes carbon thin-walled steel pipe, alloy thin-walled steel pipe, Rust thin-walled steel pipe, special-shaped steel pipe. The outer diameter of hot-rolled seamless pipe is generally larger than 32mm, the wall thickness is 2.5-75mm, the diameter of cold-rolled spiral pipe can be 6mm, the wall thickness can be 0.25mm, the outer diameter of thin-walled pipe can be 5mm, the wall thickness is less than 0.25mm, col

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