Do some research on what "certifications" you get. Some schools certify that you indeed went there. Others, you pass test for pipe, structural, etc. And you'll have to re-certify at any shop.

It's not impossible, but its like saying I have a CPL, now I can make money as a pilot.

You can take a decent course a most community colleges that will get you in the door for non certified jobs for less and start making cash right away.

-Guy who put himself through college as a Welder, ran a welding shop, and still has a lot of welding equipment.