Structural welding certification tests are usually either 3/8" thick or 1" thick. Both thicknesses use a 1/4" thick backing strip and a 1/4" gap.
Unless you are lucky enough to be tested for a Fab shop, you will probably be required to weld 2 certification test plates, one in the vertical position (also known as the 3G position) and one in the overhead position (4G). When both vertical 3G and overhead 4G welding tests are passed, the welder is qualified for all positions.
The 1" thick test qualifies for unlimited thickness and the 3/8" thick welding certification plate test has a thickness limitation. Most people think the 3/8" is a bit easier.
Either way, there are a few things you can do that will improve your odds:
- The gap is usually 1/4", use it. Don't try to close the gap, remember that the bevels are only 22.5 degrees. You need that 1/4" gap to get a 1/8" rod in there.
- Clean the metal. That means the backing strip and both plates. Get all the mill scale off. Sure the stick will burn right through and sure you will not clean everything that well in the field but this is a test.
- Either chip and brush on every tie in or light right back up while things are still hot...one or the other.
- Keep all arc strikes within the bevel where they will be consumed with weld.
Ask the test shop supervisor what kind of things will fail you before the welding certification test begins. For example, how much grinding is allowed? What size rod is permitted on the root pass? Does he want to see the fit-up? It goes without saying that you need to have practiced before you even showed up. If it is allowed, get a piece of scrap metal and weld a little while to shake off the rust. Not off the metal, but off of you.
Try not to be nervous and focus.
Good luck Welder.
To read a very different perspective on welding certification along with plenty of welding tips and tricks read Jody Collier's page on Welding Certification and For TIG, MIG, STICK welding and a buttload of other stuff, visit http://www.weldingtipsandtricks.com/
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