Causes and preventive measures of undercut of submerged arc welded steel pipeWhat is the undercut of submerged arc welded steel pipe?The undercut is a product defect produced during high-speed welding is spiral submerged arc welded pipes. This defect makes the weld seem particularly affected. And th

Acceptance method of straight seam welded steel pipe1. The inspection and acceptance of straight seam welded steel pipes shall be carried out by the technical supervision department of the supplier.2. The supplier guarantees that the delivered straight seam welded steel pipe meets the requirements o

Common anti-corrosion technology of spiral steel pipeAnti-corrosion spiral steel pipe plays an important and different role in people's daily life. Anti-corrosion spiral steel pipe generally refers to the use of special technology to treat ordinary spiral steel pipe with anti-corrosion treatment, so

The purpose of preheating the spiral steel pipe before welding(1) Preheating can slow down the cooling rate after welding, make hydrogen diffuse and escape in the weld metal, and avoid cracking caused by hydrogen. It can also reduce the degree of hardening of welds and heat-affected zones, and impro