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.
This could be handlebars for a chopper, a bike rack for the back of a Jeep, a landscape trailer, or a deer stand. (All of which could kill someone if the welds failed). The next best thing to certifying a welder is to destructively test the weld.
Lets use the chopper handlebars for an example. Obviously, you cant destroy every weld you make but what if you were to weld up a mock up set of handlebars just to prove the weld settings? Wouldn’t it be worth the price of the tubing just to have confidence in the welds?.
By welding a mock-up set of handlebars using some extra tubing of the same exact material type and thickness and then, taking the mock-up handlebars out back and beating the hell out of them with a BFH (big freakin hammer) you would have a pretty good idea on the soundness of the welds. If the welds broke, oh well, at least you weren’t going around a curve at 90 mph. Back to the drawing board until you find out what went wrong.
Resource Author Francisco Rodriguez Higueras
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