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914World.com _ 914World Garage _ Prepping Metal for Welding

Posted by: MikeSpraggi May 21 2009, 08:53 PM

What are some of your processes/techniques for prepping the metal for reinforcement kits before and after welding them in place. I'll be starting in a couple of weeks. Thanks

Posted by: jmill May 21 2009, 08:58 PM

I remove the paint, use a metal prep and prime with weldable primer. I then remove any loose (burnt) primer, prep and then re-prime and paint.

Posted by: Joe Owensby May 21 2009, 10:34 PM

QUOTE(jmill @ May 21 2009, 10:58 PM)

I remove the paint, use a metal prep and prime with weldable primer. I then remove any loose (burnt) primer, prep and then re-prime and paint.

I do the same thing, making sure to have all the metal covered with paint that I can- including the inside of pieces. JoeO

Posted by: MikeSpraggi May 22 2009, 09:43 AM

Thanks for the tips.

Posted by: 9146986 May 22 2009, 01:21 PM

Clean the paint and surface rust off with a 3M Bristle disc.

Treat with "Must For Rust", Ospho, or your favorite metal treament.

Paint both surfaces of areas to be overlayed with 3M weld through primer.

Scratch off weld through primer on weld areas. It makes it easier to start the arc, and you'll get fewer weld inclusions (crap in the weld bead).

Don't make any welds longer than 1/2". You'll have to continually tap down the overlay as the heat from welding will make it lift off the base metal. Weld the perimeters completely.

Clean off spatter and go over with bristle disc. Look for any weld inclusions, and grind out if/as needed and re-weld.

Re-clean and go over with metal prep, (MFR, Ospho, etc), seam seal and paint with Du-Pont self etching primer, and supsequent primer and topcoat.

This is what I do anyway.