Tong Lige from Tsinghua University and Bai Shiwu and Liu Fangneng from China Petroleum Pipeline Research Institute established a BP neural network model to predict the crack tip opening displacement (CTOD), the performance parameters of high-strength pipeline steel (X70) welding joints, to provide an effective means for optimizing welding process parameters.

How to choose pneumatic butterfly valve?
After all, how should we choose the products that are suitable in price and guaranteed in quality? Today, we can see from four points:
1. From the perspective of medium, according to its corrosion resistance, there are mainly the following types,. 201 is not corrosion resistant, 304 can accept certain acid-base environment, 316 has strong corrosion resistance, but 316 stainless steel can not be used in strong acid environment.
2. According to the diameter of the pneumatic butterfly valve, the professional mark is DN, which is mainly determined by the application equipment. This parameter is a fundamental parameter. Without this parameter, all other parameters are meaningless.
3. As far as the pressure is concerned, the smaller the accepted pressure is, in some environments where the applied pressure is very high, it is often necessary to add several layers of stainless steel mesh sleeves.
4. There are many connection modes of white steel stainless steel pneumatic butterfly valve, which must be clarified when purchasing. Especially for products connected with screw threads, it is better to have connectors