Godwin Têkovi’s Answer
As for Welding, a Welding class should do. However, you would need much practice in order to be good at it so I would suggest participating in projects that involve using this skill.
You may learn Plumbing Trade at Minnesota State Community & Technical College or St. Cloud Technical & Community College (https://www.sctcc.edu/degrees-programs/plumbing).
You may learn Welding Trade Hennepin Technical College or American Welding Society.
You need to learn more of these courses if you want college grades level 4 - 6:
Engineering / Technical Mathematics
Engineering Materials / Strength of Material
General Metal Work
Engineering Thermofluids - Thermodynamics and Fluid Mechanics
Engineering Measurement, Quantities and Estimation
Plumbing & Piping Technology
Principles of Surveying
AutoCAD P& ID
AutoCAD Plant 3D