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Welding valve and pipeline connection problems

2024/05/10

Welding valves and pipelines connected to the welding seam sealing welding should be used argon arc welding welding to ensure that its internal smooth and clean. For ball valve welding valve needs to be open, so as to avoid the sealing surface is spattered slag damage. For butterfly valves need to close the valve, the same is also to avoid the sealing surface is spattered slag damage. If the sealing material is not resistant to high temperature, remove the sealing material before welding to prevent welding high temperature damage to the sealing material.

In order to ensure the welding performance, need to control the welding interlayer temperature. For ordinary carbon steel, the interlayer temperature is required to be less than 250 ℃, ordinary austenitic stainless steel, less than 150 ℃ (some even less than 100 ℃, generally less than 120 ℃).

High interlayer temperature will cause the heat-affected zone grain size, so that the strength of the weld and low-temperature impact toughness decline. If lower than the preheating temperature may produce cracks in the welding process. Therefore, the inter-channel temperature shall not be lower than the preheating temperature, the highest shall not be greater than a certain boundary temperature.

For austenitic stainless steel, the interlayer temperature is too high will lead to overheating of the weld, resulting in blackening of the weld.

Knowledge base: Interlayer temperature of the weld channel

The interlayer temperature of the weld channel is the temperature difference between the different layers in the weld area during the welding process. This temperature difference has a very important effect on weld quality and weld strength.

During the welding process, the temperature within the weld area changes continuously. This is because the welding process involves heating the metal material so that it reaches its melting point, and then welding is carried out. During this process, the temperature in the weld area will continue to rise until it reaches the melting point. The temperature within the welding area then remains near the melting point until the welding is complete.

During the welding process, the temperature difference between the different layers in the welding zone affects the quality and strength of the weld. If the temperature difference is too large, it can lead to excessive stresses within the weld area, which can result in cracks or deformation in the weld area. These problems can seriously affect weld quality and weld strength.

In order to avoid these problems, the temperature difference between the different layers within the weld area needs to be controlled during the welding process. This can be achieved by controlling the heating rate and heating time in the weld area. If the heating rate is too fast or the heating time is too long, this can lead to excessive temperature differences within the weld area, which can affect weld quality and weld strength.

In addition to controlling the heating speed and heating time, the temperature difference within the weld area can be controlled by using a preheater. The preheater can increase the temperature in the welding zone uniformly before welding, thus reducing the temperature difference between different layers. This effectively improves weld quality and weld strength.

The temperature between layers of the weld channel is one of the key concerns during the welding process. Controlling the temperature difference between different layers in the welding area can effectively improve the welding quality and welding strength, thus ensuring the reliability and stability of welding.

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