|
|
I have been practicing some downhill pipe welding and I am trying to measure the amps I am using for recommended applications, my question is do I measure the amps with a rod stuck to work piece or while performing a weld. The amps during welding fluctuate quite a bit, also when I just stick a rod to get a reading they are a lot higher. Thanks in advance.
Reply:Temperature of the coffee does not matter. Its a too hot, too cold, good sort of thing.
Reply:Burns my lips no matter how I taste it
Reply:Amps is zero before welding but volts will be higher and go down when you start welding. For procedure qualifications, they have meters that clamp on the cables. Most welding isn't done by what a dial says but what the puddle says.
Reply:Thanks, so if the inspectors are checking it during the weld I think that's the answer to my question?
Reply:Originally Posted by Welder DaveAmps is zero before welding but volts will be higher and go down when you start welding. For procedure qualifications, they have meters that clamp on the cables. Most welding isn't done by what a dial says but what the puddle says.
Reply:A clamp meter just goes around the lead and gives indication of amperage output. Can be connected to either lead. Reading will only change by polarity.Pretty nifty meter. I have a Fluke one I use in conjunction with my load bank as a secondary reading. I'll usually connect my multimeter set to volts and use that too. Both give a finer reading than the bank readouts do and I use them to track any "creep" of volts and amps while under load. They give you a little more detail, and in some cases it's nice to have.That's pretty well it.Expert Garage Hack....https://www.facebook.com/steven.webber.948
Reply:How many generations of arc welders have been able to weld to code w/o ammeters?? MikeOl' Stonebreaker "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:Originally Posted by mla2ofusHow many generations of arc welders have been able to weld to code w/o ammeters?? Mike
Reply:Volts float uppity/down with arc gap...volts is what makes amps reach out there and melt the metal, and they rise with short arc and fall with long, but amps potential remins right where you cranked it in.Dial in best amps for selected rod, then stuff the rod in and watch the puddle and ignore volts....your welder is what decides volt limits and forces you to manipulate rod best....most stick welders offer you just one twisty knob, and that is amps...the welder generates whatever volts within it's range to keep the UV rays lit.
Reply:I've heard DC clamp meters for amps are quite a bit more pricey that AC clamp meters. What's getting more common is having machines calibrated on a yearly? basis so the dial indicates close to what the welder is actually putting out. Procedures will usually give you a range because not all welders like the same settings.
Reply:i hear the poet. I have a cheap digital dc clamp meter, and it jumps all over also. No mater how steady of arc gap, and consistant puddle. I think its the nature of the digital meter. I just bought a digital T5 FLUKe for slightly over a 100 dollars and now i want to throw all my other ones away. Fluke is it. The T5 dont do dc amps though. the cheapest dc amp fluke i've seen is 250-300 hundred, and i'm thinking about getting one. Sounds like 7a749 is got it going on and catching it from every angle.
Reply:The last thing I care about when I'm welding is knowing the exact amperage I'm welding at.Benefits me none.Just a couple welders, big hammers, grinders, and torches.Work will free you.Men in dirty jeans built this country, while men in clean suits have destroyed it. Trump/Carson 2016-2024
Reply:Radio shack has some DC for under a hundred bucks. Sent from my SCH-I545 using TapatalkCRIME SCENES, COURT DATES, FUNERALS, RIDING THROUGH THE CITY WITH A BITCH THAT IS JUST BEAUTIFUL IT'S JUST BUSINESS AS USUAL.
Reply:Originally Posted by Welder DaveI've heard DC clamp meters for amps are quite a bit more pricey that AC clamp meters. What's getting more common is having machines calibrated on a yearly? basis so the dial indicates close to what the welder is actually putting out. Procedures will usually give you a range because not all welders like the same settings.
Reply:Originally Posted by 123weldi hear the poet. I have a cheap digital dc clamp meter, and it jumps all over also. No mater how steady of arc gap, and consistant puddle. I think its the nature of the digital meter. I just bought a digital T5 FLUKe for slightly over a 100 dollars and now i want to throw all my other ones away. Fluke is it. The T5 dont do dc amps though. the cheapest dc amp fluke i've seen is 250-300 hundred, and i'm thinking about getting one. Sounds like 7a749 is got it going on and catching it from every angle.
Reply:I could care less what the welding machine says. You could have 2 identical welders side by side and one can weld hotter or colder than the other with both set the same amps on the machines. If I need more heat, I turn it up. Less heat, I turn it down, simple as that.JasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720
Reply:Originally Posted by snoeproeI could care less what the welding machine says. You could have 2 identical welders side by side and one can weld hotter or colder than the other with both set the same amps on the machines. If I need more heat, I turn it up. Less heat, I turn it down, simple as that.
Reply:For around $10-15. you can get a 200A DC current shunt and a digital or analog panel meter. They come in other sizes as well.http://www.ebay.com/itm/DC-0-300V-20...item3f44551c74http://www.ebay.com/sch/i.html?_odkw...Text=&_sacat=0"USMCPOP" First-born son: KIA Iraq 1/26/05Syncrowave 250 w/ Coolmate 3Dialarc 250, Idealarc 250SP-175 +Firepower TIG 160S (gave the TA 161 STL to the son)Lincwelder AC180C (1952)Victor & Smith O/A torchesMiller spot welder
Reply:Originally Posted by wornoutoldwelderVolts float uppity/down with arc gap...volts is what makes amps reach out there and melt the metal, and they rise with short arc and fall with long
Reply:Originally Posted by KelvinI was taught the opposite – long arc increases voltage, short arc decreases voltage. (This makes sense, since you need higher voltage to cross a larger air gap. Think of lightning.)This is why some stick welders automatically increase the voltage when you "drive" the rod into the puddle, to prevent sticking due to the voltage (and thus wattage) of the arc being too low.
Reply:I could be wrong here but im thinking you would have to look at this well you are welding too see the current...it would disappear as soon as u lifted your arc... if a guy could make it hold the current value somehow for 60 seconds like the newer inverter units due it would be a usefull upgrade on an old transformer type machine... I do agree with the people that say read the puddle, but a meter such as this could put you back at that sweet spot with out a lot of hassle when you change current for dif type/sizes of rod or to use ur machine for scratch tig... any electronic genious's on here??
Reply:Great responce from everyone .
Reply:Originally Posted by rambinI could be wrong here but im thinking you would have to look at this well you are welding too see the current...it would disappear as soon as u lifted your arc... if a guy could make it hold the current value somehow for 60 seconds like the newer inverter units due it would be a usefull upgrade on an old transformer type machine... I do agree with the people that say read the puddle, but a meter such as this could put you back at that sweet spot with out a lot of hassle when you change current for dif type/sizes of rod or to use ur machine for scratch tig... any electronic genious's on here??
Reply:If you can weld one handed you can get a reading. Most clamp-ons have a hold function. Get your clamp around one lead, get your thumb on the hold button, get a good consistant bead going, hit the hold button, looky what it says."The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life." -Theodore RooseveltOriginally Posted by MinnesotaDaveFor measuring purposes, I'd set the camera (on video) so it saw the weld and the readings - then a guy can check it after making a good run.
Reply:It's been a while since I've been on a welding job that didn't require calibrated amp-tongs. Before any production welding starts I'll have one of the guys run a bead and confirm each machine is reading out properly. The third party inspector is going to, that's for sure. If you're welding outside the parameters of the procedure specification wouldn't it be nice to know before him? I suppose if he gives you a hard time about not doing your job correctly you could always say, "I could care less what the welding machine says. You could have 2 identical welders side by side and one can weld hotter or colder than the other with both set the same amps on the machines. If I need more heat, I turn it up. Less heat, I turn it down, simple as that."
Reply:Look on ebay for a used Fluke 136 clamp meter. They run around $110-120 and will measure DC amps up to 600A. I use it for measuring MIG amperage.Despite claims that it's unnecessary, in my opinion you don't really know what you're dealing with unless you measure it. If procedures call out a specific voltage/amperage, the only way to know if you're really in range is to measure it. Set up the meter(s) next to each other, setup your phone or camera to video record the meters, then run a bead. The values will fluctuate somewhat, but you'll have a working range.I'd say it's definitely worth doing, even if just for curiousity or educational reasons.Last edited by Jieve; 05-24-2015 at 01:10 AM.
Reply:Originally Posted by Make It HotIt's been a while since I've been on a welding job that didn't require calibrated amp-tongs. Before any production welding starts I'll have one of the guys run a bead and confirm each machine is reading out properly. The third party inspector is going to, that's for sure. If you're welding outside the parameters of the procedure specification wouldn't it be nice to know before him? I suppose if he gives you a hard time about not doing your job correctly you could always say, "I could care less what the welding machine says. You could have 2 identical welders side by side and one can weld hotter or colder than the other with both set the same amps on the machines. If I need more heat, I turn it up. Less heat, I turn it down, simple as that."
Reply:Originally Posted by AKweldshopThe last thing I care about when I'm welding is knowing the exact amperage I'm welding at.Benefits me none.
Reply:Code work runs by strict guidelines. Amps, travel speed, weld deposit and so on are defined with a range and must be followed. I've done plenty of code work and have seen welders booted for violations. Not fun losing a moneymaker of a job for a simple turn of a knob. Sent from my iPhone using TapatalkLong after the price is forgotten, the quality will remain.Both of my Poppy's 1954 Short Hoods -Third generation to weld with it and teaching a fourthSA 2## - Bought and sold more than I can remember or care to list, 8 in the shop right now
Reply:Some code may require those type of guidelines but not all. I weld structural steel for a,living, all code work. I've never been told or given a print/drawing that told me what side rod I had to use and what amperage I have to run it at. I've just never seen that. The only thing I see is what size of weld I need to put in to meet the engineers weld requirement. I used to have pressure pipe tickets at my past job. Stainless tig and black iron stick. Same deal. Never once was I told what size rod I had to use or the amperage I must run. It was entirely up to me.JasonLincoln Idealarc 250 stick/tigThermal Dynamics Cutmaster 52Miller Bobcat 250Torchmate CNC tableThermal Arc Hefty 2Ironworkers Local 720
Reply:In my current job this is critical, today i was running a qualifying procedure for a duel shield pipe weld, miller XMT 450 with an LN 25 wire feeder, 24 volts with the feeder reading 275 (probably not acurate, but welding nice), the machine amp readout was reading around 190-200 amps, but welding engineers clamp read it as 114 at the mig gun, quite a difference
Reply:I like doing things just to satisfy my curiosity, so I won't criticize what you are trying to do.Many add-on amp clamps attach to regular digital multimeters and they output 1 millivolt per amp. You set the multimeter to millivolts, but you are actually reading amps through the amp clamp. There are also dataloggers that will record amperage use over time. Some you can hook up to a laptop. Here's an example:http://www.microdaq.com/dent_instruments/ct-logger.php |
|
发表于 2021-8-31 22:36:20