|
|
Hello all!Okay, my predicament is that I can do all types of joints with Dual Shield just fine after some practice. However, I've never done a multi-pass vertical groove weld like this before, and I have a lot of questions. It's going to look like this, so at least I don't have to worry about an open root. http://www.gowelding.org/wp-content/...t_Position.jpg So, should I use stringers, or weave? And how should I stack the stringers or the weaves? Any tips on setttings? And any overall info you feel like passing on to me about this particular test would be great. Thank you very much!
Reply:Weave it side to side. I take this test frequently. Start on your backing strip and use a slow weave (hold and pause side to side.) there can be no dip in the middle. Good luck!
Reply:Some of the stuff I am going to say you may already know so please don't take it as I am insulting your intelligence because I am not. If this is a structural test you need to use stringers, in my experience that is. If you have access to a narrow nozzle they come in handy for the first few passes. Keep your nozzle pointed slightly up to avoid blowing a crater into your backing plate of prior pass. You should be able to run single stringers for the first 2-3 passes then you will need to bump it to two stringers per pass, then eventually three until you are ready to cap. Let your plate cool before you cap to avoid excessive undercut. I usually let mine cool to about 250-300 degrees. I run my cap either left to right or right to left. I try to avoid left, right then center but that's just me, doesn't mean that you can't. If you are running a 1' coupon pre heat to a minimum of 200 degrees and don't let it exceed 500. Your caps cannot exceed 1/8' from the face of the coupon. Start your beads prior to the groove and run it past the groove at the top. If you start getting high spots grind them down as you go to avoid building these spots up for when you are ready to cap. Place your ground at the bottom of your backing plate, if you need you should be able to tack a small piece of plate at the bottom to place your ground on. I hope this helps and I am sure you will get some good advise on here. People have all kinds of great advise on here. I them out and use what works for you. Check with your supervisor to find out what they want you to use as far as stringers or weave. If you weave TigMonster above said it best above. Good Luck!!!!
Reply:It might also be worth mentioning settings, I run lincoln E81ni1-h at around 27 volts and 350-375 ipm for vertical grooves on pipe, this should be a decent starting point for you, i highly recommend running stringers rather then weaving on the test simply to control heat input, good luck
Reply:If that's a 3/8" thick plate, with a 1/4" to 3/8" wide root opening, you're only going to have about 4 beads total....the root, the pass over the root, and a 2-bead cover. The wire diameter size is a factor, too, though...It's vertical up, so some amount of weaving is necessary.Rich
Reply:Ah yes the settings. We run Lincoln 255 in the shop. I usually stay between 25-26.4 on volts and 305-315 on wire speed. My settings are not as high as mentioned above but both setting given will definitely get you in the ballpark and you will just need to fine tune it for you. Neither is wrong just personal preferences and different machines.
Reply:No not at all.
Reply:We used to give this test all the time. 1/16" wire and 100% CO2 will have you weaving rather fast. .045 wire will allow for stringers even with CO2 for shielding. The biggest mistake guys (and ladies) made was not letting the plate cool between passes. I gave this test literally hundreds of times and the best advice I can give is be patient and let the plate cool.
Reply:Originally Posted by DoctorBuzzI don't really use wire all that much, but doesn't the wire speed actually need to change depending on how much wire is actually left in the box?? i.e. -- freshly replaced spool would need to be much, much slower than a spool that is almost out of wire?
Reply:Check out www.weldingtipsandtricks.com . It offers a few videos on up hill mig procedures.Miller TrailBlazer 251Miller HF-250-1Miller MaxStar 150 STLHyperTherm PowerMax 380 plasmaLincoln PowerMig 180Millermatic 252Miller Diversion 180 |
|
发表于 2021-8-31 22:30:09