Only if it's a Chinese bearing and you ground it through the rubber tire.:wink:can you damage a bearing if you are welding and ground goes thru it .
I know computers are a sensitive thing but I have a hard time believing enough current would indirectly go astray so to wreck a bearing...
This old myth comes up regularly. My ground is next to where I'm welding. I have yet to disconnect a battery on anything I'm welding on. I have yet to cause any damage other than the turkeyshit mess I generally make with the stick or torch. The electrons will take the shortest path available to them.
Might be time to check your grounds inside the welder. I burned off a ground inside a Forney and killed a pig welding in the barn. Good thing I was holding the metal with rubber gloves and wearing rubber boots.I was welding a pintal hitch on my truck, the battery disconnect was turned off yet I completely fried the VHF radio!!
We had a Lincoln 225 stick welder that if you were welding outside you would "get bit" if you touched the work that the ground was hooked to. So even if the ground clam is hooked close to were you are welding it is possible some energy could pass to the earth and cause bearing damage.
When welding out doors I drive a rod in the earth and ground what I am welding.
Keep in mind that the single 14000 volts coming into your yard has the earth as its neutral and even though your 220 volt welding machine doesn't have a neutral the earth can still be part of the circuit and cause damage when welding even though the ground clamp is hooked close to the welding.
When we welded steel caps on our packer wheels, we did it on the machine. Just grind a clean spot and keep moving the ground clamp to the wheel you are working on and you won't have any problems. Just don't hook your ground to an axle or anywhere you have to draw the current through a bearing.Thanks you everyone for the advice , I am modifying the packer wheels on my strip tiller and decided it was just as easy to remove them and weld them on the welding table.