What is the weld size you would indicate on your design sketch – 2.0 mm? If you do, you are wrong.
Why? Because the code, CSA W59 or AWS D1.1 and others stipulate that the minimum fillet size for
35 mm thick plate is 8 mm. Why?
The answer to this question involves a lot more consideration than just the simple strength calculation.
It involves welding heat input, cooling rate, welding metallurgy, weld mechanics, weld cracking, and last
but not least, practicality. It is impossible to lay down a fillet weld that small in a structural fabrication
shop. If you do show 2.0 mm fillet on your design sketch, the draftsman will know that you have no
welding design experience.
We need codes and standards to legally protect our professional career and, most importantly, to
ensure public shafety.