I can't speak to what every employer would be looking for, but I would recommend going for it. If for nothing else as it would show a potential employer that you have the ability and desire to learn and improve yourself in that field.

In welding, most employers will want to 'Qualify' you in the process they are using, in the way they use it. Having a 'Certification' from school at least shows that you are able to pass that test.