The requirements for stainless steel elbows are very high, and all of them are excellent in research. According to the current status of domestic argon flushing devices for stainless steel pipes, the operation is more convenient and argon saving for the welding quality of Ф60～Ф426mm pipes and elbows. Due to the characteristics of gas, argon filling devices in pipes and elbow welds have been developed. The practical application is excellent. It provides more advanced and effective construction tools for argon flushing in stainless steel pipes.

  　　 I. Overview

　　In the construction of argon arc welding of stainless steel pipelines, argon filling in the pipeline is an important part of the welding process. The filling of argon in the pipeline plays a decisive role in ensuring the welding quality. In the past, during the welding construction of stainless steel nozzles in oilfields, the materials used for filling the welds with argon were not standardized, resulting in poor weld protection and waste of materials and argon, which affected the quality of welding. In order to solve a series of problems such as the poor control and waste of argon filling in the welding of stainless steel nozzles in the past, and a series of problems such as oxidation on the inside of the weld, we have developed a weld fillet with the advantages of wider application range, easy operation and saving argon. Argon device.

　　 2. Current status of argon flushing in stainless steel pipes

In the past, in the construction process of argon arc welding of stainless steel pipelines, the pipeline was filled with argon gas. Foam sponge, carton board and other materials were usually tied to the inflatable pipe to seal both sides of the weld. Although it can reach a certain level, it cannot be used for elbows. Internal flushing argon