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I have an old, old Sureweld Model 295 AC welder. When connected to a 40 Amp outlet, welder acts as if it has very little power. Even when settings are to the highest levels the system acts as if you are trying to weld with 5 amps! Ground clamp is new and directly clamped to a 4 foot piece of ground angle iron (2x2) Lots of sticking 6011, very small and faint arc characteristics. I also have a Sync. 251 that works great from the same power outlet. So, I have ruled out that the 40 amps were my problem.Does anyone have an idea of what the problem might be? Maybe some cleaning of some parts inside the machine? Which parts?Machine worked well and then it went to storage for about 8 years. Any ideas?Thank youKell
Reply:Hey Kell,If you're absolutely sure that the outlet you're using is good (my first thought was a bad breaker!! doesn't happen often but it does happen) I'd disconnect the machine...thats VERY important!!! Open it up and see if you've got a bad connection inside somewhere. YOu might find that most of your arcs are occuring in there though I'd think you'd hear/see something like that....in storage for eight years? could be mouse nests and god knows what all in there...worth a look anyway... good luck
Reply:I concur with wmb97 that a good cleaning and close inspection is the first order of business. While it is open, look for any signs of overheating like discoloration of connections, burned insulation, etc.Is the Sureweld 295 a basic tapped transformer buzzbox? A moveable magnetic shunt (laminated iron bar moved in or out of the transformer core)? Moveable primary winding? Saturable reactor? Active electronic control?If it has a big crank or lever, make sure the bar or winding is moving as you make the adjustment, that is, the link is not jammed or broken. If it is a saturable reactor control, check that you have voltage out of the control transformer and current through the control potentiometer. A saturable reactor controlled machine will have a very large (perhaps 4 or 5 inches in diameter), low resistance potentiometer (variable resistor). This type of machine will go to minimum output current if it loses control voltage. Check any fuses in the control circuit. Measure voltage from the low end of the pot to the wiper to see if it varies as you move the pot wiper. No variable voltage means no control and no ability to increase output current from minimum.If the basic mechanism or circuit seems to be functioning, measure voltage across each connection or major component using a VOM. If you don't have a VOM (or multimeter or DVM) you can get one for less than $10 these days. Try Harbor Freight or an electronics supply house.To make your measurement, disconnect welder power, connect your leads to the points of interest, then plug in the machine and turn it on and draw welding current while someone reads the meter. (Min/max reading storage meters are handy here if you are working alone.) You shouldn't see any significant voltage across any switch or screw connection.Let us know what you find.Good luck.awrightLast edited by awright; 08-10-2006 at 01:55 PM.
Reply:Thanks for the input!! I will open up the cover this weekend and see whats inside. Awright, your just a little farther ahead of me when it comes to all the stuff you mentioned.... but I will do my best to follow your instructions. The machine has a crank handle on the front and when turned, a indicator bar moves horizontally.I'll post results here in a few days.Kell |
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发表于 2021-9-1 00:15:36