How to Distinguish between High Frequency and Submerged Arc Straight Pipe

The high frequency straight seam steel pipe and submerged arc straight seam steel pipe have obvious difference in the industry, mainly in the appearance and the weld, the appearance of high-frequency steel pipe body smooth, no oxide attached. In the weld, the high-frequency straight seam pipe weld is high for the flow, uneven jagged irregular weld, in the factory before the weld was "scraping" out, leaving a relatively flat weld Clear traces; submerged straight seam steel pipe in the appearance of a slight strip of indentation, mainly in the steel pipe inside. Submerged arc straight seam pipe weld is neat higher than the base metal 1-3mm weld She high, the factory can be carried out according to customer requirements of the weld "grinding" in addition to leaving the grinding wheel grinding traces.