buzzing welder transformer?

Grant Erwin · 2006-09-01T18:55:01+00:00

I have a main transformer in one of my welders that's just starting to buzz. I checked the bolts holding it down - tight. I pushed on the top corner, sideways, so as to compress the laminations together - bingo. Down about 1" from the top, a bead is run. I don't want to monkey with the bead.There is a wedge pressing the laminations together, but it's been varnished along with the rest of the transformer core, and doesn't want to move.However, the top corner of all the laminations is punched with about a 3/8" hole, and all these holes line up. I'm considering looking for a plastic tube, cutting it to length, and finding (or making) a couple of plastic top-hat washers and putting a 1/4-20 bolt through the hole and snugging the bolt up a little. I'm pretty sure that would work, since a few ounces of sideways pressure cuts the noise nearly in half, but I'm wondering if it's safe to do.I also am wondering if I really need to worry about fully insulating the bolt, or even insulating it at all.GWE

Sep 01, 2006 20 Replies

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Martin H. Eastburn 20 years ago

One thought - Might not be the core itself - might be how it is mounted ? - rattle in the box ? Might be just a wedge on the mounting point or some dope there as well.

Martin Martin H. Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH & Endowment Member NRA Second Amendment Task Force Charter Founder IHMSA and NRA Metallic Silhouette maker & member

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