For the Classroom - Drafting

Objectives:
Introduce students to the drafting side of welding, surface finishes, and Geometric Dimensioning and Tolerancing (GD&T). Supplement with real life examples and some common practical applications.

Discussion Topics:

Welding:


• Familiarize students with different types of welded joints and welding processes
  
• Teach students how to properly use common weld symbols on a drawing
  
• Rule of thumb for weld sizes (typically with respect to thinnest metal being welded)
  
• Finishing welds
  
• Welding dissimilar materials



Surface Finish:

• Familiarize students with the different types of surface finishes
  
• Review machine operations that will achieve certain finishes — raw material vs. machined vs. polished (show pictures of the parts and sample parts)
  
• Discuss when better finishes are required
• Preferred call out, and that there are other ways to call out (N Grade)



Geometric Dimensioning and Tolerancing (GD&T):

• Why is GD&T important? - (basically, it describes allowable variation)
  
• Familiarize students with the different types of GD&T, what they mean, and how to properly add GD&T to a drawing
  
• Discuss how adding unnecessary precision to a part, adds unnecessary cost