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I am welding aluminum, pretty thick stuff with a Miller Dialarc HF on the high range power output setting 140-310. The machine is hooked up to a single phase 230 100 amp circuit.I have a water cooled torch.About the only thing I have not recently checked is the points. I have never set them, could that be the source of the problem? All the other maintenance type things have been checked and double checked.Recently I have noticed my ground cable is getting pretty hot. Any one have an idea what is going on? It was hot enough to melt the electrical tap over the extension to the ground cable.Thanks in advance.
Reply:Check to see if the lug is tight over the cable at the machine. It may need a new on with a tight crimp. That or loose nut, or loose inside.Ground leads are the devil for me. I have to retighten them regularly or else that connection burns up.Weld like a "WELDOR", not a wel-"DERR" MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.
Reply:Thanks, I will double check all the connections. Bought this welder used a few years back and the ground cable looks really old and original. The splice in the middle worries me, I think I would like to replace it with a better connection. What is the recommended way to splice to ground cables together?
Reply:Is the heat localized to a certain area of the cable (splice, connection, etc)? or is it pretty much the whole thing? If it's the whole thing you cable's resistance is probably just too high. And no the high freq spark gap won't have anything to do with it.Welding/Fab Pics: www.UtahWeld.com
Reply:Make sure your cable is layed out with no loops. It can snake around, but loops can cause heating.
Reply:thisis a tweco connector, i use it to connect the output from my machine (heavier cable) to the light ten foot lead i use at the stinger for felxibility.. Attached Images
Reply:Thanks everyone for the great responses.1) Yes the heat is localized to the splice site and to the connection to the welder. The rest of the cable is just slightly warmer then ambient temp, but certainly not hot. I suspect both these connections are loose or implemented using sub-standard materials.2) I never would have considered the looping effect. Thanks for that advice.I will check with the local welding supply and get a new splice and maybe a new connector to the welder.
Reply:I get the same problem when the ground is bad..Can't even touch it sometimes it is so hot..What I do is make sure that the ground is on clean metal and I CLAMP the ground clamp to the ground surface..Get it nice and tight and I will bet you 10$ the problem goes away......zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Just a basic 101, but any loose connection increases resistance and resistance increases heat. Just keep this in mind it applies to everything from automotive wiring to, obviously, welding equipment!Miller Diversion 180Hobart Handler 140 (Soon to be replaced with Miller 211?)Miller Spectrum 625 Extreme
Reply:Originally Posted by jeffwruleYes the heat is localized to the splice site and to the connection to the welder. The rest of the cable is just slightly warmer then ambient temp, but certainly not hot. |
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发表于 2021-8-31 23:13:11