tev,thank you for your information. Low sulfer material is not as difficult to weld as most welders say that it is, I have been welding low sulfer german made valves for about five years.the problem most welders have is trying to weld the material without using a machine with a pulsing capabilaty.
MCGUIRE,THE VALVE IS AN INTERNATIONAL DESIGN, BUT THE VALVE CAN BE PRODUCED IN ANY PART OF THE WORLD.SIGNICAST IN THE U.S. PRODUCES A VALVE WITH A COMPOSITION MORE WELDER FRIENDLY.
the stress cracks are in the base material and mate material, base material is a german cast 1/2" globe valve with a .065 wall thickness joined with standard 1/2"x.065 tube. no filler wire is used as it is being orbitaly welded.the ferrite is so low that it does not show a measurement...
i am having problems with heat stress fractures in low ferrite(0%-.2%) 316L sainless!Just wondering if there is something that i can do to correct the problem when making butt weld fussion welds
