There are a number of economic advantages that arise through using high strength pipeline steels. The reduced wall thickness leads to lower steel tonnage requirements and provides scope for reducing welding time. Until relatively recently, the API specification 5L " Specification for Linepipe" only covered steels up to 70 ksi minimum yield strength. This document reports on small scale weldability tests on two X80 grade steels and presents mechanical property data on full-size circumferential girth welds. Small scale SMA weldability was assessed using the WIC test with cellulosic consumables ...
There are a number of economic advantages that arise through using high strength pipeline steels. The reduced wall thickness leads to lower steel tonnage requirements and provides scope for reducing welding time. Until relatively recently, the API specification 5L " Specification for Linepipe" only covered steels up to 70 ksi minimum yield strength. This document reports on small scale weldability tests on two X80 grade steels and presents mechanical property data on full-size circumferential girth welds. Small scale SMA weldability was assessed using the WIC test with cellulosic consumables of matching strength. Weld metal, rather than HAZ, hydrogen cracking was found to occur at preheat temperatures below approximately 110 C (230 F). Heat affected zone cracking was not observed in any of the WIC tests.