We have an issue with one of our orbital welding items, for which Im looking for out of the box ideas..
The issue deals with the Marangoni effect; the tube we weld is A269-TP316, and the other item - also SS316 - was found to have a too high (i.e. out of spec) sulphur content. The weld pool was so asymmetrical, that there's no complete side wall fusion on the OD, possibly also on the ID. so the weld failed on VT.
It was then found by OES that sulphur levels were as high as 0.043%, much higher than 3.1 MTR. Obviously, the item is out of spec. Due to various reasons were still investigating if we can still use these items. Hand welding is not possible, due to very small dimensions and accessibility. Weve tried a multi run orbital weld, with no effect.
Are there any other ideas, for orbital welding, that could provide a remedy? Perhaps a slightly modified weld bevel (Y-shape?), or some flux or addition? I know Swagelok uses orbital weld flux, but have no idea of its purpose
The issue deals with the Marangoni effect; the tube we weld is A269-TP316, and the other item - also SS316 - was found to have a too high (i.e. out of spec) sulphur content. The weld pool was so asymmetrical, that there's no complete side wall fusion on the OD, possibly also on the ID. so the weld failed on VT.
It was then found by OES that sulphur levels were as high as 0.043%, much higher than 3.1 MTR. Obviously, the item is out of spec. Due to various reasons were still investigating if we can still use these items. Hand welding is not possible, due to very small dimensions and accessibility. Weve tried a multi run orbital weld, with no effect.
Are there any other ideas, for orbital welding, that could provide a remedy? Perhaps a slightly modified weld bevel (Y-shape?), or some flux or addition? I know Swagelok uses orbital weld flux, but have no idea of its purpose
