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Hi guys, I am looking for some input pertaining to codes. We are welding 2" furnace tubes, Sch. 40, to a 4" sch.80 header. The 2" tubes are beveled and are fit up to the header with a 1/8" root opening. They are calling for a full pen root, with a 1/4" fillet. Now, on the top of the Header where the 2" 'T's' to the 4", we are able to get a proper 1/4" fillet and can be measured using a 1/4" fillet gauge. However, where it comes down towards the side, or the radius of the 4", we are having an QC inspector still using a fillet gauge, coming off of the 2 and saying it is under filled. In order to have a 1/4" effective throat using his fillet gauge, it would have to be a big mound of weld deposit there at the sides. What I am getting at, if we took a 2" pipe and branched it off of another 2" pipe, you could get a 1/4" fillet on top, but your sides would be flush and you would only be able to get a groove weld at that point. It would be impossible to have a fillet weld there. Is there not an exception to the code or rules governing branch weld connections, calling for fillets, to help deal with radius issues? This is an ASME code job. Thanks for the time and look forward to any input or direction.
Reply:Our branch welds (typically weld bosses), call for 1/2 T, or 3/16", whichever is less. T =wall thickness.So, if the wall thickness is less than 3/8", then the bottom toe of the weld would be 1/2 of the wall thickness away from the sidewall of the boss when using the gauge. We have an adjustable slide gauge for measuring these welds.If the wall thickness is 3/8" or greater, the bottom toe of the weld has to be 3/16", but never more than that.I understand what you're saying. It almost seems like you would have to run an extra layer of weld over those shallow angle areas.Do you have a copy of the ASME code?Rich
Reply:It is to ASME section 8. |
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发表于 2021-8-31 22:32:41