| The Craftmans Shop > New from Old |
| KES-1600 / HBS Stud Welder |
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| awemawson:
--- Quote from: vtsteam on January 08, 2015, 08:57:14 AM ---The thing I would avoid, though, Andrew is sticking your tongue across the terminals of those capacitors. --- End quote --- Well the missing screw from the back panel was a self tapper, and it points straight into the can of the rear (of three) capacitors - I had to make careful measurement to make sure it wasn't going to pierce as it's only a few mm away :zap: |
| vtsteam:
So is that 66K UFd total? thinking nasty thoughts like how complicated can that be to build? Is there a step down transformer on the output of those caps or does the output just go directly to the stud contacts? Seems like it would develop too high a voltage without some kind of reduction, since I'm guessing the actual welding is at low V and huge A. |
| awemawson:
Steve, I've not pulled it apart, but as far as I can see there are three of those capacitors, all the same physical size. The thing is quite light so no 50 hz transformer though probably some form of chopper / inverter arrangement for charging them. Don't know for sure, but I suspect the discharge is direct from the capacitors through whatever switches it, and I expect that they will be special high current low internal resistance types. I used to spot weld tags onto NiCad cells years ago just by charging a big capacitor to about 150v and letting it wack the tag - very effective |
| vtsteam:
Oh, I just noticed two leads going to the gun -- maybe things are more complicated ??? |
| vtsteam:
Well maybe one is a local gun shield ground....maybe those vise-grip ground clamps only partially supply the ground -- or maybe they are for a different job situation. |
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