Can stainless steel pipe grooves be cut by gas welding?

The stainless steel pipeline cannot be cut with gas, the stainless steel has strong thermal conductivity, the incut heat input is unbalanced, the nozzle is seriously deformed, and the amount of butt misalignment is large, which is a common problem in stainless steel cutting. In addition, the content of other alloying elements in stainless steel is high, and high-viscosity oxidation substances are easy to form during the cutting process, and high-pressure oxygen cannot be blown away and cut seams cannot be formed. In general, the higher the carbon content of the alloy steel, the more difficult it is to cut and not conducive to cutting.

Stainless steel material.

It is difficult to cut with gas cutting!

Combustible gas. When oxygenation is used as a heat source to cut metal, the main heat source comes from the combustion of the metal in a pure oxygen atmosphere (mild steel.

During gas cutting, the heat released by the combustion of steel in oxygen accounts for more than 70% of the total heat), and then the slag is brought out of the cutting seam by high-speed oxygen flow.

So to use gas cutting to cut metal, the following conditions must be met:

1. The material is easy to oxidize and can be burned in pure oxygen;

2. The melting point of the material is higher than the ignition point;

Stainless steel due to its excellent corrosion resistance, will not burn in oxygen, so only the heat of combustible gas can not complete the cutting, so stainless steel can not be cut using oxygen and combustible gas;

Similarly, under normal circumstances, metal aluminum, copper, etc., because its ignition point is much higher than the melting point, so after heating to melting, it will not burn, so copper, aluminum and other metals can be heated to melt, but can not form a good cut seam, will collapse into pieces, so the use of gas cutting can not be cut.

However, if you need to process the welded bevel, you can use a special pipe beveling machine, which is available from many manufacturers, and you can also use a plasma cutting machine.

The main thing is to look at Party A's welding process diagram, which is marked with a groove and generally has to be played.

If it is a pressure pipe, such as a steam pipe, a high-pressure oil pipe or a water pipe wall, the thickness of more than 5 mm should be beveled.

For non-pressure-bearing pipes, thin pipes should be directly butt welded, such as wire bushings, etc., and welding through will be OK.

The groove refers to the groove of a certain geometric shape that is processed and assembled into the part to be welded of the weldment. The groove is mainly for welding the workpiece to ensure the degree of welding, and under normal circumstances, the profile processed by the machining method can also be gas cut when the requirements are not high.

The groove is mainly for welding the workpiece, to ensure the degree of welding, under normal circumstances, the profile processed by the machining method, when the requirements are not high, it can also be gas cut (if it is a class of welds, ultrasonic flaw detection is required, then only the machining method can be used), but the oxidation slag needs to be removed, according to the need, there are X-shaped grooves, V-shaped grooves, U-shaped grooves, etc., but most of them require to retain a certain blunt edge.

This depends on the wall thickness of the tube and the strength of the connection.

If the wall thickness of the pipe is greater than 8-10mm, it is recommended to open the groove welding, if it is relatively thin, it is not necessary.

It depends on the wall thickness of the pipe, if the wall of the pipe is too thick, it has to be beveled, and the form of the groove is different.

OK. But Hu Li must be welded inside and out.

A pipeline is a device made of pipes, pipe connectors, valves, etc., which is used to transport gases, liquids, or fluids with solid particles.

The groove is mainly used to weld the workpiece and ensure the degree of welding, and the profile processed at the welding place before welding.

Because the other side of the blunt side of the groove cannot be welded during welding, the spike is done early to weld the pipe inside and outside the bevel (X bevel) must be welded twice inside and outside the pipeline to complete. Therefore, the X groove will only be used for pipe welding on the big guess sparrow type pipe. Since it is impossible to weld the inner wall of small pipes, X-grooves are not used.