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Hey guys, looking to knock these off asap but will have very little practice opportunity. I'm a pretty adept stick-welder, I use the force and watch my puddle at any heat rather than pay too much attention to numbers and "weave rhythms" so I can produce decent results regardless of the hand I'm initially dealt. Been fishing through the forums and have found a little scattered info on exactly what's involved in these tests, but I'm looking for specifics. From what I understand so far:-3/8 plates w. 1/8 backing 45 bevel on one side 90 on the other 1/2 inch gap.-All tests are 7018 root pass start-stop at around 1.5-2 inches on one side, 4 on the other-Roots are inspected, then you complete, and they re-inspect your tie-ins-Fill/cap at your own discretion, run it in hot, keep it clean, cap is no more than 1/8 (3mm) reinforcement.-plates are then broken and inspected for lack of fusion/slag inclusion etc. Any faults greater than 1/8 (3mm) constitute a fail.Questions I have are mainly to do with 3F/4F:Uphand for roots on 3F... up/down or a slight back/forth weave? I would think up/down to rip into the joint corners a little better and produce a slightly smaller root pass than a weave, but opinions here are welcome.Cap on 3F... uphand stringers or a single weave pass?4F: Technique for root (angle/inclination/weave)? I can't remember. 1F 2F 3F 4F: - I hear people talking a lot about grinding off the cap... I was under the impression that Your test coupon would be broken "as-is"... that you weren't allowed to touch your work with a grinder or you would fail. True or false?Additionally, flux-core CWB, is it just the flat/horizontal that are tested on this process or do they have vertical/overhead also? Most flux-core is just flat/horizontal only, but things may have changed from when I last dealt with the process.Thanks for the info in advance.
Reply:If you have no time restriction:Use the smallest rod diameter available."Stringer" beads......... no weave what so everYou only want to burn the first 50% of the rod.... so ... set your machine hot.Turn your machine down when your ready to cap since the coupon will be hot.Grinding the finished product is a "NO".... As I was told many times -- "I'm giving you a welding test, not a grinding test".Good Luck,HoboLincoln SA200's... at least 15 - 20. They come and go. Growing partial to the "Short Hoods" in my old age. Last count on Short Hoods was 13 in possession.
Reply:Awesome, thanks for the info. Uphand stringers possible without any kind of weave at all? I'd have thought you'd have to move away from your puddle a bit to keep it from overheating on the way up, even a small amount... just clarifying.
Reply:Im assuming CWB is the same in most places , but in Canada we bend test ours, therefor the welds after the inspector has checked them need to be grinded down flush. Over grinding will result in a fail. Your CWB is cut into 3 pieces , where they will bend 2 pieces one way and 1 piece the other way. if there is over and 1/ 8 of a crack its considered a fail. for your 3F your cap is a weave. The whole coupon is a series of weaves except your first stringer that you run on the 90 degree side. Also flux core comes in all postions, GMAW is only in flat and vertical.
Reply:Here ya go:http://www.grbwelding.com/_CWB_Procedure_and_Rules.pdf
Reply:You have to use 1/8 rods. Each plate is visually inspected when complete. If the cap passes the visual inspection, the backing strip is removed (some test centers machine it off, some test centers gouge or wash it off with torch) and your plate is cut into 3 pieces. The 2 pieces with your stop and restarts are root bent (backwards) and the middle piece is face bent against your cap. Your cap will have to be ground off prior to bending the pieces. You will also have to grind a bit of material off the back side of the coupons as well. On my vertical plate I run 2 passes then weave in the rest of the fill and cap all in one. I carry a very large puddle and lots of heat on the fill/cap for vertical up. On my overhead, I use 3 small root passes instead of 2. I like to carry a smaller puddle in overhead position.The inspector will mark your plate with a soapstone to ID your stop/restart locations. I like to mark the backing strip with a 5/16 cold chisel to ID the stop/restart location. I find it much easier to see a chisel mark on the backing strip than a soap stone mark on the plate.Last edited by snoeproe; 05-07-2014 at 03:42 PM.JasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720
Reply:That link to GRB welding has a few things that differ from a CWB test centre. Your allowed 1hr max per plate/position. You should be able to do it in less than half that amount of time. You can use a pick set or a piece of a band saw blade for picking/cleaning slag etc. you can over grind the back side as long as you maintain the 3/8" thickness of the plate (from my experiences anyway) Thus you will have to leave a little cap on the other side to maintain the 3/8 plate thickness. Make sure you verify that with the inspector prior to grinding. Sent from my iPad using TapatalkJasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720 |
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发表于 2021-8-31 22:27:47