Welded steel pipe slag is residual inside the weld slag. Theoretically analyzed, submerged arc automatic welding weld slag produced by the following three main reasons: ① raw materials (including base metal, wire, flux) inclusions more; ② multi-layer welding layer cleaning is not clean; ③ selection of welding process parameters are not appropriate, is not conducive to the emergence of slag.

Spiral pipe is generally sent to the hands of the user production workshop is not put so much spot, which requires the dealer to place some spot. However, dealers generally do not have a large indoor warehouse, most of them are outdoor warehouses, spiral pipe in the outdoor put can not avoid the wind and sun. So, how to distinguish between floating rust and rust of spiral pipe?

Spiral welded pipe is frankly also a spiral steel pipe is called, generally refers to the diameter of more than 1 meter spiral steel pipe. Steel pipe should be hydrostatic, bending, flattening and other experiments, the surface quality has certain requirements, usually delivery length of 12 meters, often require fixed-foot delivery.