The easiest way to become a certified welder is to do a fillet weld break test, Send it to a weld testing lab, record the welding certification on a sample AWS form... Done.
Let me explain.
Welding Certification does not need to be overly complicated though more often than not, it is made to be complicated.
A simple horizontal (2F position) T joint can be used to certify a welder provided things are done right, tested right, and recorded right.
Welding codes allow for all levels of certification. The reason simple tests like a 2F fillet break test are rarely done is that because of the qualification limitations. A 2F fillet weld break test only qualifies for fillet welds, and only in the flat and horizontal positions, If that covers the scope of your work, then you are fine using a simple test like this.
Most employers take it to the other extreme and attempt to select a welding test that qualifies for all positions, all weld joint types, and all thicknesses.
What happens then is one or all of these 3 things:
The failure rate goes thru the roof
Welders are unable to pass unless an inordinate amount of practice is allowed.
The visual inspection criteria is dumbed down because otherwise, nobody passes.
None of these things are good. That is why it is important to select the appropriate welding certification test... one that certifies to the task and not much beyond what is needed. Trying to get all the qualifications that might ever be needed out of one single welding test is impossible, unreasonable, and expensive in the end.
It is much better to start simple and go from there.
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