Weld joint issues
Thread Content
Appendix J of GB150 specifies that for butt welding of nozzles to the cylinder, the weld height should be no less than 6 mm. If my nozzle has a wall thickness of 3 mm and is of full penetration design, does the weld height still need to be 6 mm?
If the wall thickness of the cylinder is thick, the wall thickness of the fitting should be increased; otherwise, welding problems may arise. If both the cylinder wall thickness and the fitting thickness are thin, the required welding height can be appropriately reduced.
The provisions in HG20583-1998 can be referred to
Welding with the thinnest pipe being 3mm