Issues with product welding test plates

Usually, there are only test plates for Type A welds; I have never encountered test plates for products with Type D welds before – this is the first time I see such something

We only fabricate test plates in accordance with the code requirements and GB/T150 standards. No D-type weld joint test plates have been made – what standards require this anyway?

The NB/T47016 standard also does not contain any provisions regarding Class D weld joint test plates. Which expert prepared the technical document?

The main material of this device is Q345R (R-HIC). It is known that such materials are used in environments exposed to H2 and wet H2S. I’m not sure why the designers have made such requirements for the test specimens of this product; as the manufacturer, it’s difficult to meet these requirements and there is no clear basis for them. What are others’ opinions on this?

That P2 is just a simulated test board; it doesn’t serve much purpose and lacks true representativeness. A welding assessment is sufficient.

It’s the same for us; they require a welding certification document for the manhole fittings that are welded to the shell plates. The manhole fittings (which are equivalent to straight pipes) are of the plug-in type, and combined welds (angle welds and butt welds) are formed with the shell plates. They ask for a certification document, but it seems there’s no standard specifying this.

This post was last edited by Changing the name is so troublesome on 2018-2-2 at 11:49. What’s there to not understand? Just create another one according to the design requirements. Although the cylinder and nozzle welding joints are classified as Category D, their actual definition refers to butt weld fillet joints; the method used for covering them depends on the local pressure vessel inspection agency, as each agency may have a different interpretation of the standards. A few years ago in Guangzhou, such joints were changed to be covered using two weld evaluations: one to cover the thickness of the pipe fitting and another to cover the thickness of the cylinder; if it is possible to cover both thicknesses simultaneously, then one weld evaluation is used. If it’s really difficult to operate, you can consult the boiler inspection agency and the design party

Maybe they didn’t understand what I meant. What is meant here are the product test boards that come with the product. It’s not a weld evaluation test plate; it would be great if it were one. Anyone who works in welding knows how to handle it

This post was last edited by Changing the name is so troublesome on 2018-2-2 11:56. Isn’t this also the way product prototypes are handled? Do you mean a Type A weld like a straight groove, to be welded together with the test plate? It’s also not possible to weld together the product test plates for the Class A joints of the take over and the cylinder