What are the common surface defects of stainless steel square tubes? How was it caused?

　　(1Lap welding. There is a low lap joint phenomenon on both sides of the weld seam. It is mainly caused by poor forming adjustment, uneven extrusion rollers, insufficient or incomplete scraping of outer burrs, etc.

　　(2Butt-weld joint. There is often water leakage and burrs protrude at the point of butt welding and line correction.

　　(3Indentation or indentation. Indentation may occur at various stages of the production process, such as iron slag adhering to the surface of the forming and sizing extrusion roller, rough clamping of the flying saw, rough surface of the straightening roller, burrs being pressed into the pipe end, rough clamping of the pipe cutting machine and the flat head machine, etc.

　　(4Pockmarks. Pockmarks on the inner surface are more likely to occur when manufacturing steel pipes that use cold strips as raw materials and require the removal of internal burrs. The main reason is that sparks during welding splash and are pressed into the surface by support rollers or grinding machines.

(5Scratch. Scratches may occur at every stage of the production process.

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