I would certainly use a bolted connection to a welding table I use regulaly to minimize the hazard of frying a power tool as was discussed earlier.
One of the other problems is that most of the "consumer" type welders, (Lincoln 225, Miller Bobcat etc) have a lower open circuit voltage than production welders. This was done for safety reasons.
This makes it harder to establish a ground as there is less "sparking power" to cut throught the dirt, rust, paint, etc with one of these welders.
With a production welder, it has the voltage to burn through more of the dirt etc and establish a ground.
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