|
|
For those that use the big guns in carbon arcs...I'm needing some ideas. Running two miller 750's in parallel for 1000 amps on 5/8" carbons with 100psi. Problem is the carbons are burning up and breaking apart prematurely so a lot of the rod is being wasted. Symex torches that have 4x1/8" holes in the V-blocks that hold the carbons. Some of the guys are saying they run like crap until the air is turned up to 200 psi. However, it just isn't possible to be pushing 200 PSI continuous. So, is this a CFM issue or an air pressure issue? everything I've been able to find on carbon arcing recommends 100 PSI with no appreciable increase in productivity with more air pressure.... Which would lead me to believe this is a problem with torch design more than the air supply. Any insight from those of you who use this size of carbons?Last edited by BCTimberwolf; 12-08-2011 at 03:31 PM.
Reply:100-PSI should be a minimum, but a carbon arc eats up CFM. I always like using a 185 CFM compressor to carbon arc with.Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:Just from reading the Arcair manual, excessive burning of the carbon rod means too much amperage. Although, the Arcair manual calls for 1000 - 1250amps, did you try turning it down some? Maybe your amperage is higher than you think."Where's Stick man????????" - 7A749"SHHHHHH!! I sent him over to snag that MIC-4 while tbone wasn't looking!" - duaneb55"I have bought a few of Tbone's things unlike Stick-Man who helps himself" - TozziWelding"Stick-man"
Reply:I wonder if the rods didn't get wet at some time.Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:To much hydro or your air line is to small 100psi will work but it should be constant and Fed threw 3/4 hose and dont take to big a bite. I run 1/2 CA with 3/4 line at 175 psi max the comp kicks on at 150 psi and never drops below PaulAnother day in paradise You only have to be smarter than the metal". WeldiniMaking an honest living is nothing more than stealing from someone who can afford it and everyone feels good when it's over . Weldini
Reply:This is actually an engineering buddy who ran into this problem at his foundry. There are numerous machines set up like this being run off the same line but the air is constant 95-97 psi. I suggested high amperage as well but that has been checked. They are running the symex S-66 foundry torches. Looking at the pics it looks as though the air holes are futher away from the carbon than on a smaller torch such as a K3000. I just wonder if there isn't a design flaw that the air is bypassing the carbon completely and not providing any cooling. But yet once the pressure is cranked up to 200 PSI it becomes turbulent and cools the carbon off a bit.They go through almost a million dollars a year in electrodes so I don't believe moisture to be an issue in this case. The only way I see this to be fixed is to run a higher air pressure.
Reply:Originally Posted by BCTimberwolfThey go through almost a million dollars a year in electrodes so I don't believe moisture to be an issue in this case.
Reply:i would say its a pressure problem. I would say 120 PSI would be the min i would push through a 3/4" line at that amperage.Vantage 500's LN-25's, VI-400's, cobramatics, Miller migs, synch 350 LX, Powcon inverters, XMT's, 250 Ton Acurrpress 12' brake, 1/4" 10' Atlantic shear,Koikie plasma table W/ esab plasmas. marvel & hyd-mech saws, pirrana & metal muncher punches.
Reply:Cut the pressure to 100 and amps to 900 , use jointed carbons for no waste we run hand and Arcair full automamatics at the same settings . Lincoln SA-800 and DC-1000 for the amps !!! John
Reply:Originally Posted by BCTimberwolfFor those that use the big guns in carbon arcs...
Reply:Sorry no pictures of the castings. But here is a pic of a 3/4" carbon. Unsure of amperage. Everything looks normal from where I'm sitting so as I've discussed with my friend, I believe they are trying to use to high of amperage and force the rods into the work which is just being counterproductive. There are some other issues which need to be addressed as well as there aren't any torches they can find that are made to handle the amps and duty cycle that these guys are using. The symex foundry torch was essentialy developed for them, but is lacking a bit. Attached Images
Reply:Looks to me like this is a case like ol John Henry had, man against machine. If the man can out work the equipment, to the point where the equipment / consumables fail, one question comes to mind. Where is the production in doing it this way? Sometimes you just have to back off to a slower pace so the equipment / consumables all stay afloat. What do you gain if you can go like he!! for 5-minutes, but broke down for 10-minutes.Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:You might add air compressors too for more CFM. Maybe plug in an engine-driven unit to experiment?If the torches are a problem, a machine shop can make whatever you want. Not necessarily cheap, but you aren't restricted to factory designs. Maybe add "nozzles" to the jaws to precisely focus the air better than traditional "holes"? Maybe call Symex tech support and see if they have any gear they'd provide for test?
Reply:Maybe your friend should look into these. http://www.oxylance.com/http://www.mining-technology.com/con...g/oxylanceinc/Dont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400 |
|
发表于 2021-9-1 00:04:03