Quote:
Originally Posted by mongocanfly
When I was doing mine ,I used copper everywhere that I could....just for insurance
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Greg, we need to talk....
Get rid of the crutch, it's a heat sink..
Quote:
Originally Posted by A1971Blazer
1/4”
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1/4" isn't too awful big, and if you have a center cutting end mill should be able to use it and clean out the paint inside the plug weld holes (slow speed in cordless drill??). I use a Letter A drill bit for most of my plug welds, a bit higher heat, and faster wire feed. Fills quicker, gets done quicker. Hotter weld setting will give you a flatter plug weld for less cleanup. And NO copper backing. You are adding a heat sink that is going to move you back towards a cold weld. The only time a copper backing should be used is when you have thinned metal (rust), pinholes to fill, or an ill-placed gap to fill.
Here's a tutorial on the plug weld bit for cleaning holes. This uses a narrow flat so less likely to remove metal than your end mill. We just want to clean paint out of the hole to improve weld quality.
https://www.youtube.com/watch?v=J1jXNfJj2ac
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