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Welding Preparation for Best Results

The Voice: Hey, Kevin. What are you doing?

Kevin Caron: I'm about to make this piece of metal longer by welding a little piece on the end of it. Then I can cut it to fit in the hole that I need it to go in. But I've got to prep the metal first.

You can't weld with the metal being rusty, because when you come along with your MIG welder and are welding along, you're going to hit all that rust. It will get into your weld and contaminate the weld; you?ll have a bad weld and it just won't last. The weld will be weak and it'll break.

You don't want that to happen, so get out the grinder and clean all that rust off of the area that you're going to weld.


These are Bessey welding clamps. They're great!

Can you see the difference? The metal is now bright and shiny. The red and rusty isn't worth working with.

While I was at it, I also put a little chamfer on the edge. Notice this little edge where I was going flat with the grinder, then I turned the grinder at a little bit of an angle and went across it one time, just to put a little chamfer.

I'll do my other piece the same way. On the bottom of this piece, it?s still vertical then it comes up and then out for the chamfer.

When I butt these two pieces together, I'll have that wider surface at the top where I can put a nice, wide bead down inside so everything will hold together.
I'll flip it over and I'll also chamfer this side.

Now I've got that vertical area in the middle of the metal, with a chamfer on one side and a chamfer on the other. Nice weld. Never break. It'll hold up just fine.

That's what I've got to, clean these all up. This is important with MIG welding. It's even more important when you're TIG welding: clean, clean, clean.

The metal has got to be clean! That's how you get your best welds.

Back to work.

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