304 stainless steel welded steel pipe, abbreviated as 304 stainless steel welded pipe, is commonly used as a stainless steel welded pipe made of stainless steel plate or strip after being rolled and formed by the machine and mold. The production process of 304 stainless steel welded pipe is simple, with high production efficiency, multiple varieties and specifications, and less equipment funds. However, the compressive strength is generally lower than that of stainless steel seamless steel pipes. In recent years, with the rapid development of high-quality stainless steel strip rolling production and the advancement of stainless steel welding and inspection technology, the quality of welds has been continuously improved, and the variety and specifications of welded stainless steel pipes have been increasing. In more and more fields, especially in heat exchange backup pipes, decorative pipes, medium and low pressure fluid pipes, stainless steel seamless steel pipes have been replaced.