P11 Welding

admin

Hi everyone,I need some tips, recently i had a welding test, it was supposed to be P11, but only the consumables were for P11 the pipe itself was carbon steel.I failed the test and was given a second chance, I will be using ER80S-B2  and 8018 rods.The test didn't lookg bad at all but I was told that I was a bit slow with the cup, was told to walk it faster otherwise the bead on the inside would look too dark like it's burned.And it did lookk a bit dark to me and it didn't pass the X Ray.So what I would like to know is if this is the real problem and I just have to walk the cup faster or is there anything else I should be aware of?Thanksin advance
Reply:That's the first I've ever heard of it.  I noticed no discernible difference between the low chrome filler materials and electrodes.  Oxidation doesn't show on film.  Either the darkness was some sort of legitimate defect (concavity, root undercut, etc) or you busted on something else like porosity or slag.  I notice very little difference until you start getting into the 5 and 9 chromes, where the puddle can become noticeably sluggish, and even then, those effects are diminished on a carbon steel test coupon.
Reply:hi Supe,So you say that there's nothing to do with how fast we walk the cup right?I will be practicing tomorrow all day, should I keep do it like I did? the pipe looked good the root was fine, I've filled it with TIG and then did the cap with stick.Don't really know what I was doing wrong. If you have any good tips I would really appreciate that.Thanks for the reply
Reply:Weld it just like Carbon Steel. The only difference will be in production in which preheat and interpass temperatures will change.