what is duty cycle of welding machine?

admin

where can i study detail about duty cycle of welding machine? (exp: book, magazine....)
Reply:I can tell  you MOST machines are rated in a 10 minute duty cycle.  SO if its a 20% duty cycle, you can weld 2 minutes out of 10 at what ever amps the duty cycle is rated for.  As welding current goes down, duty cycle goes up.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:The duty cycle of welding machines is very simple. It is how many minutes out of 10 minutes you can weld. 20% duty cycle, you can weld 2 minutes and rest the machine for 8 minutes. 60% duty cycle, 6 minutes welding time out of 10 and so on.
Reply:Just go to Google or any search engine, type in "duty cycle welding machine."I just say that to give you more awnswers.The computer does not have all the awnswers about welding and metal work because welding started BEFORE computers became popular.
Reply:David and Oldtimer are telling you correctly. I've never seen any welding equipment with a duty cycle other than 10 minutes.The difference between art and craft is the quality of the workmanship. I am an artist.
Reply:Originally Posted by Jolly RogerDavid and Oldtimer are telling you correctly. I've never seen any welding equipment with a duty cycle other than 10 minutes.
Reply:There is a simple formula you can use to figure out different duty cycles as amperage changes on your machine.  Duty Cycle= ((Rated Current)^2/(Desired Current)^2) x Rated Duty Cycle --Gol'
Reply:Snap on rates theres in an hour.  They are red welders too.  BUT not the same as a real RED welder.  Gas welders are usually rated at 100% duty cycle.  Ranger 250..... 100% @ 250 amps.When I buy one, I look at the 100% rating, like my V350 is 100% @ 300 amps, 60% @ 425.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:Originally Posted by enlpckIn the US, it is 10 min (NEMA standard, with three variations for what duty cycle the machine is rated at--as I recall, it is 100%, 60%, and 40%, but can't swear to it)The european standard is based on 5min.See Galvery and Marlow for more info.
Reply:are there any equation to calculate duty cycle of welding machine? for example... a machine can welding for 5 minutes and 45 seconds (power supply cut off by thermostat at this time), then it need 12 minutes and 35 seconds to cool down and can resume welding. how to calculate duty cycle of this welding machine?
Reply:Originally Posted by windsonare there any equation to calculate duty cycle of welding machine? for example... a machine can welding for 5 minutes and 45 seconds (power supply cut off by thermostat at this time), then it need 12 minutes and 35 seconds to cool down and can resume welding. how to calculate duty cycle of this welding machine?
Reply:Well without digging out the calculator or anything like that and based on your info. Having hit the thermal limiter in the machine the duty cycle has been exceeded and probably causes the 12 minute plus cooling time because the machine has overheated it looks like you probably have about a 30% duty cycle.  Given the total time of 18 minutes and 20 seconds just call it 18 minutes and welding time of roughly six minutes you get 1/3 or 33%. There are several factors that affect that duty cycle and the cooling time. The surrounding air temperature, airflow through the machine, how dirty the machine is inside, and others, but that gives an idea. That's all rough, but if you stick with it your machine will last much longer. Every time you hit that thermal limiter your machines lifespan has just been shortened. Like everyone has said, in the US duty cycle is based on the number of minutes you can weld in ten minutes and the number of minutes the machine must cool. Thirty percent duty cycle equals 3 minutes welding and 7 minutes cooling. You can't determine anything by running until it shuts down because you have already exceeded the duty by that point. The duty cycle is where the machine will operate without shutting off.The difference between art and craft is the quality of the workmanship. I am an artist.
Reply:Hey Jolly Roger,You can go ahead and send that Sync 250 (toy) on up to me here in VA.  I could use a backup since "you have no use for a machine without a 100% duty cycle @ 200A".Per Miller's spec sheet and my owner's manual, the Miller Syncrowave 250 DX is rated at 200A @ 28VAC at a 60% duty cycle.Sometimes your posting make no sense.Syncro 250 DX Dynasty 200 DXMM 251 w/30A SG XMT 304 w/714 Feeder & Optima PulserHH187Dialarc 250 AC/DCHypertherm PM 1250Smith, Harris, Victor O/ASmith and Thermco Gas MixersAccess to a full fab shop with CNC Plasma, Water Jet, etc.
Reply:You'll have to look up the specs on your specific machine. There can be a lot of variance as you can see from the other replies. There is no formula per say to calculate the duty cycle. Running it full out till the thermal trips on it isnt the best way to find it out lol.Latest Toys Miller 180 Mig and Elite Mask!!Wright Welder 225ACShop OutFitters 20/20 Bending SystemHypertherm 380 Plasma30 Years of Sparking (Electrical & Welding)
Reply:My wrist can't run a tig at 100% duty cycle either. You want it too sundown. I would be happy to trade you. Tell ya what, I'll swap you the synchro for your pipline rig. I don't need one, but I know someone who does. I do have a couple of machines that are less than 200 amps at 100%. Had them before I got into the heavy stuff and see no need to get rid of them. They are all paid for (as are all of our trucks and equipment) and might come in handy someday. Learned my lesson when I got the XMT304, my only complaint about it, and from that machine on it has been 200 amps at 100% or I'm not buying it. Taking the fact I disagreed with you about something a little personal aren't you. Oh, and the screen name has nothing to do with being happy. Look up Jean Lafitte and see if you figure it out.Everyone else I apologize for sundown and myself.WolfmanJack is absolutely correct. aaaawooowooooThe difference between art and craft is the quality of the workmanship. I am an artist.
Reply:Unfortunately duty cycle isn't as so clean cut that you can use a stop watch to work with. It's a guideline issued by the manufacturer to allow you to rough gauge your activities. Most duty cycles are also derived at around 104º ambient. Actual work temps and field conditions will play a roll. However at 104º and your machine setting in full sun the internal temps are already at a huge handicap. Anybody thats ever picked up a piece of iron in the summer knows that. Your duty cycle can go to zip real quick.  Welding at a nice 70º or 80º would be ideal in more ways than one I suppose. .
Reply:Originally Posted by windsonwhere can i study detail about duty cycle of welding machine? (exp: book, magazine....)
Reply:Originally Posted by windsonwhere can i study detail about duty cycle of welding machine? (exp: book, magazine....)
Reply:Sandy., the Lincoln SA-200 is the perfect example of what you said. Every one just fires up and welds with them, no thought of duty cycle or resting it. Just weld whatever you are working on with whatever size rod and however long it takes. They just keep on welding. I once ran one that the engine used 4 quarts of oil a day and the only rest it received was when it was getting a quart of oil poured in it. It welded just as good as the new machines my boss had. If you had shut down and said "I have to let my machine rest a few minutes" you would have been run off.Mind you I don't advocate abusing your equipment. It is what makes your living so take care of it.
Reply:Originally Posted by David RGas welders are usually rated at 100% duty cycle.  Ranger 250..... 100% @ 250 amps.David
Reply:I really wish they still made the sa200, but in a little more compact unit. They are about as tough as an anvil.The difference between art and craft is the quality of the workmanship. I am an artist.
Reply:One of the reasons why you should always get a bigger machine is because as many have stated. The duty cycle is often based on full output. I use my larger machine, in midrange output only. So I can weld continuously and do twenty feet of aluminum welding, and not cause an overheat at all. It does not even warm the thing. The torch may get a bit warm, even with the water cooling, but not the machine. As soon as you stop, the torch immediately cools down.        Sincerely,             William McCormick
Reply:Jolly,If you haven't figured it out, I was pulling your leg about the Sync 250.I've had one for about 12 years and it's been a bulletproof machine.  A lot of what I do is anodized aluminum (marine) at about 210A (Bump method) and I fully agree that the machine will come a lot closer to 100% DC than I will.What's really ironic, is that the duty cycle figures really apply more to the consumer type machines (small migs) than they do to the industrial machines.  Here you don't even have a volt setting, just a number/letter and wirefeed speed (on most not even an actual wfs but a relative number).  How the heck is a relatively inexperienced welder supposed to determine when he's approaching his duty cycle?Oh, and by the way, good friend of mine who owns a fab shop specializing in exotic metals (titanium mostly) feels if it's not a three phase machine, it doesn't belong in his shop.  To each his own.Syncro 250 DX Dynasty 200 DXMM 251 w/30A SG XMT 304 w/714 Feeder & Optima PulserHH187Dialarc 250 AC/DCHypertherm PM 1250Smith, Harris, Victor O/ASmith and Thermco Gas MixersAccess to a full fab shop with CNC Plasma, Water Jet, etc.
Reply:I wouldn't mind having 3 phase myself. I would really like to see if this ancient Westinghouse works. There are some great deals out there on the older high amperage machines. I've only managed to fry one industrial machine. It was a brand new 400 amp Miller, but I am pretty sure it was a defective machine, especially after we got it back and my boss told me to do exactly what i did the first time and it didn't make one rod. I really think most of the older industrial machines were under rated much like the sa200s were.The difference between art and craft is the quality of the workmanship. I am an artist.