Need help asap with MIG spray arc!?

Need help asap with MIG spray arc!? Topic: Need help asap with MIG spray arc!?
July 19, 2019 / By Andri
Question: running a lincoln power mig 350. the wire is 0.045 Mil spec 70S2 hardwire. the gun is a magnum 400. shielding gas is 98%argon with 2%Oxygen at 42cfh. I'm trying to run a testing coupon of 3/8" thickness with a 30 degree bevel (60 degree total for both sides) with a 1/8" root gap. using 1/4" backing plate. I have the machine on setting "21" for 0.045 argon mix welding. the procedure per the PQR says that I should be using 3/4" plate with the same bevel and a 3/16" root gap running 27 volts and 300 amps. Cannot seem to get it to work what so ever. I've already tried 4 tests and each one has linear cracks down both sides of the root which carry thru the entire weld sequence. I've tried preheating the plates and postheating the plates. I've tried a ton of different amperages and wire speeds to no avail. it seems like the spray just wants to suck into the sides instead of getting down into the root on my initial pass. Does anybody know exactly what settings or parameters I should be running for these conditions? I've always run fluxcored wire at my old job and this spray arc hardwire mig is really pissing me off. also, any idea why i keep getting cracks/porosity? it's carbon steel so I cannot understand why this is so difficult especially running in the flat position! I've run fluxcore 0.045 vertical up tests that were over an inch thick and a foot long with absolutely no problems and they passed RT, PT, and VT testing so I can weld believe it or not this is just a totally new procedure for me. any advice or suggestions are much appreciated because my boss is about to kick me out the door even tho he's told me to use 3 different shielding gases already so he has no clue. Yahoo/answers doesn't really have a category for this so if anybody knows where I can find the info that'd be great too.
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Best Answers: Need help asap with MIG spray arc!?

Whitaker Whitaker | 10 days ago
This is a problem that is almost quintessential of pulsed MIG. What you probably don't know is that for welding steels, pulsed MIG is costly and irresponsible gimmick. (Don't tell the folks from Lincoln I told you that....) If you want to solve your severe lack-of-fusion and lack-of-penetration problems I strongly advise you to stop using pulsed MIG. Turn the pulsed mode OFF and switch to traditional CONSTANT VOLTAGE, spray transfer. (If you don't know how to do this consult your owner's manual.) You may also wish to switch to Ar+15%CO2 shield gas. In my opinion Ar+2%Oxygen is better suited for short-circuit welds on thin gauge materials, than for spray welding of thick plate. Ar+CO2 mixes are both less oxidizing in nature, provide more weld energy, and generally provide more consistent penetration. However Ar+O mixes can be used for spray. (EDIT: 70S-2 is perfectly FINE for this application. The two circumstances where you should choose 70S-6 is either using using 100% CO2 gas, or welding rusty, scaly steels. 70S-6 has a lot more deoxidizes (mainly extra Si+Mn) in it, which results in a slower freezing, much more fluid weld puddle. This can lead to cold laps and undercut in some circumstances.) The optimal (CV) spray setting for .045" is around 500 ipm and 26-28 volts, which will draw about 280 amps. That may be a bit hotter than you've been accustomed to at this point. Trust me, that is a good thing. If you wish you can increase up to 570 ipm and 27-28 volts which will draw about 300-320 amps I believe. Please feel free to fine-tune your voltage until you get a nice quiet crackling sound, with very few "pops" or "plops." Here a little extra info you may appreciate: Pulsed MIG is an AC process. One wonders why would a person would choose to use a process that is at it's maximum current only 10% of the time, the rest of the time is at a low "background current?" With CV spray transfer, the arc is at it's maximum possible energy and maximum possible current 100% of the time. An additional problem with pulsed is that the voltage pulse used to pinch off a metal droplet also causes the wire tip to burn back several mm. This results in an excessively long, wide, low current, fairly diffuse arc that provides poor cleaning action and lacks concentrated heat in order to promote good penetration. For steels traditional CV spray will always provide superior results for flat and horizontal welds. For out-of position welds, traditional flux-core wires like E71T-1 will always provide superior results. For welding thin gauge materials, the simple and easy-to-use short circuit mode is all you need.
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Whitaker Originally Answered: Is my cat trying to spray?
If urine is being released (and believe me, you'd notice the smell) then he is spraying. In neutered cats, this is a sign that they are unwell or worried that their territory is under threat. This web site has a check list of 18 reasons why cats might begin scent marking and how you can solve the problem. http://www.celiahaddon.co.uk/pet%20probl... However if no urine is being released, then it's a sign that your cat is happy. This behaviour is known as "feather dancing". When a cat is especially happy to see their owner, they shake/vibrate their upright tail and sometimes pull their tail down towards their back. When my female cat does her "feather dancing" she does a treading/dancing motion with her back feet, standing almost on tiptoe whilst she dances. She makes cute little chirruping sounds while she dances too. If any of this sounds like what your cat is doing - take it as a compliment, because it means he is overjoyed to see you. You can read more about this and other cat body language on the Messybeast web site. http://www.messybeast.com/cat_talk2.htm Hope this helps.
Whitaker Originally Answered: Is my cat trying to spray?
well if you got him neutered after sexual maturity then spraying was already a habit so yes that would be his way of marking things. Some cats do continue spraying after they are neutered but not as heavily as before. I have the same problem.
Whitaker Originally Answered: Is my cat trying to spray?
I had my male kitten neutered quickly. He began such acts after a year. I believe he was begging for 'tuna' and 'rubs' more than anything else. After a female cat was introduced, he did begin this shrill stand-up of demanding now! After a year he began showing the ropes ,to her. Inside provocations ceased after strict human intervention. It only took a a time or two to have them want outside, to further thier ventures, with each other. My 'Tom' helped Her to see a big view of the possible. She loved this new playground and 'ran' with it fully. He stayed fully ready to 'pounce' the intruder, reguardless of the hour. What an honerable guard!

Samuel Samuel
Why are you running S2 wire? S6 would be much better. Next I would change gas bottles, sometimes you just get a bad mix. You didn't say how the weld sounded, not that it would be easy to describe that sound, but the sound should be consistent not having any change. The weld cracking is ringing a little memory, but as of right now I just can't recall it. Try going to Lincolns web sight they have a good tech section or you could call them. Lincoln employs welding technicians that can tell you what's going on. After some thought, turn up the wire speed. .045 should be smoking fast. I think Lincoln should have the voltage/wire speed chart on thier web site.
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Samuel Originally Answered: Systems of equations ASAP ASAP HAVE A TEST 2MORROW!?
y = x² + 2x -1 y = 3x + 5 substitute 3x + 5 = x² + 2x -1 x² - x -6 = 0 (x-3)(x+2) = 0 x = 3 or x = -2 once you know x, you can find y.....from either equation. I'll choose the simplier one y = 3x + 5 = 3(3) + 5 = 14 and y = 3x + 5 = 3(-2) +5 = -1 so the points that solve this are (3,14) and (-2,1)
Samuel Originally Answered: Systems of equations ASAP ASAP HAVE A TEST 2MORROW!?
o.k., so which you would be able to desire to locate elementary equations with a view to set up your tips. permit c = the style of youngster tickets, and permit a = the style of person tickets. the 1st equation would be: a + c = 295, because of the fact the total style of tickets is 295. the 2d equation would be: 5a + 2c = 1220, because of the fact the person tickets value $5 and the youngsters tickets value $2, with a complete volume of $1220. Now, we could desire to locate an equation with a view to make certain what 'c' is comparable to with a view to make certain what 'a' is comparable to later on. So, we could desire to take the 1st equation and rearrange it. a + c = 295 c = 295 - a next, we can replace it into the 2d equation with a view to make certain the style of person tickets bought. 5a + 2c = 1220 5a + 2(295 - a) = 1220 develop the brackets out. 5a + 590 - 2a = 1220 collect like words. 3a + 590 = 1220 Get the style of 'a's by potential of itself. 3a = 1220 - 590 3a = 630 Divide by potential of three to get the value of a single 'a'. a = 210 subsequently, there grew to become into 210 person tickets bought. good luck sooner or later, and that i'm hoping this helped you.

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