MIG Welding: Fixing Flaws and Porosity in Welded Steel
The Voice: Hey, Kevin. What are you doing?
Kevin Caron: I'm playing with my squirt gun. It's kind of a slang name for a MIG welder because you just pull the trigger and metal just comes out the end of it.
This is a stand for a large sound sculpture I've been working on here in the studio. I finally got the shape I want, and yesterday I ground it all down.
Turns out I've got some little boo-boos - a couple of little low spots on the metal. So I'm going back over and re-welding all the joints again and clean up the weld - the bad spots.
When I get done re-welding I'll come back and grind it all down. I might have to go back a couple more times, hit a couple of little spots, low spots, and also a little crack on the other side.
Here you see I've got some porosity. It's actually a pain; these little areas right along the joint are where you can get a little contamination in it; for example, if the wind blew.
Because I work outside (I don't have a closed building), if a gust of wind comes along and blows the shielding gas away, I end up with a little porosity. If you get a bubble inside the weld, it pops if you weld over the top of it. So, you end up with a hole.
Now I have to come back in with a grinder and grind that out so I get back down to solid metal again, then weld it again, grind it down; hopefully I get it all.
It's one of the little things you've got to work with when you're working outside.
If I was running a stick welder then I wouldn't have the problem with the air, the wind blowing by, but it's just a lot messier. And I like playing with it.
Back to work.
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