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been practicing for and upcoming test and developing a procedure on 8" sch std line pipe for gas pipelines onsite in position, in the 6g position using lincoln pipeliner 6p+'.if anyone has any experience in stove piping id appreciate it if i could pick your brain a little, or at least see a picture of a completed weld. cheers Klay.C Attached Images
Reply:photos are rotated 90 degrees to the left for some reason lol
Reply:Excellent work. Nice job on the root.Call and talk to the person who is administering the test. Ask them if the WPS/WPQ specifically calls for stovepiping/whipping. If the test doesn't require it, don't bother. If you can make fill pases that consistently look as good as your photos, then why bother switching to a new technique? The last pipe tests I took with stick, and it's been about four years for me, called for 6010 root and 7018 fill passes. It seems odd to me that they would call for 6010 only for both root and fill. Most of the pipe work I do is in shop and we tend to use TIG root and dual shield for fill.
Reply:Thanks manThis is a welder qualification test and to qualify the procedure.We are testing on the 8"(200nb) sch std and that will qualify us to weld from 50nb - unlimited diameter and from 5mm - 16mm WT with majority of the line being 500nb. This will only be used for site and in position joints in the factory, the rest are done in rotators or rollers with a tig/STT root and pulsed mig fill and cap. We are specifically using this technique for the obvious reasons of speed and versatility, but also, having a qualified weld procedure for 6010 root, fill and cap will enable us to employ the process in the future where we would otherwise have tig root and 7016 fill and capped |
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