According to the statistics of the United States in the 1990s, the economic loss caused by the failure of welded joints reached 5% of the national economy. In a large number of failure accidents of welded structures to metal materials, the analysis results show that most of the failure of welded joints is caused by insufficient toughness of metal materials. The metal material in the joint rapidly melts and solidifies during welding, resulting in large residual stress due to the binding force of surrounding metal. The metal material repeatedly undergoes the phase change process of melting and solidification, forming coarse columnar grains, and producing defects such as precipitation, inclusions, pores and microcracks, which significantly reduces the initial properties of the material. Due to the complexity of dry accidents, it is difficult to predict the failure of a certain structure for some reason. However, from a statistical point of view, the failure of most welded structures is caused by the lack of toughness of dry materials, fatigue cracks caused by small defects, and continuous growth.

Can the large aperture compensator be replaced?
As usual, more and more center in the practical application of parts should choose the large aperture compensator. In practice, they are also thinking about this when selecting these large aperture compensators. No matter whether the caliper compensator can really be changed, the natural gas pipeline certainly has a variety of design styles in the design and application process. In order to eliminate assembly lines, there are many designs to improve their profitability. In addition, can I change the large aperture compensator?
Large diameter compensators and other products will have a high level design in the process of practical design, so as to introduce the air flow of all upper ball valves. It is better to have a comprehensive understanding according to the practice. Eliminate the damage caused by the settlement of various buildings on the pipeline. The understanding of the pipeline or valve in the air must be based on the practical situation. In this case, it is worried that the pipeline will damage the system under the condition of thermal contraction and shrinkage. It is also very convenient to install these large diameter compensators or disassemble them.
Take a look at the pneumatic butterfly valve. It can not eliminate the vertical direction, not only the longitudinal direction, but also the lateral stress. For example, these gas pipelines need to be overhead. These two different buildings, in this case, it is most necessary to add some pneumatic butterfly valves, mainly to avoid the damage caused by the two buildings falling on their pipelines, Therefore, we must pay attention to the relevant environment in this regard.
In addition to the working medium or temperature, the external environment is also very important when selecting a large aperture compensator.