Sand-hole pipes are also a kind of quality accident caused by weld leakage, but their gaps are very small, some of them cannot be directly observed by human eyes, and must be found through testing equipment, so we call this kind of pipes sand-hole pipes. The main reasons for sand hole pipes are as f

The hydraulic testing machine is suitable for various pressure-bearing products to perform performance tests such as compressive strength testing, burst testing, and sealing performance testing. The hydraulic testing machine has a wide range of applications, such as rubber hoses, hoses, spiral welde

Square cold-formed hollow section steel is a section steel with square cross-section shape and size made of hot-rolled steel plate after cold-bending and then high-frequency welding. It is also called welded square steel pipe. The section steel has a stable production process and high precision, and