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Welded Vs. Mechanical Frames (Some call it Modular) 

Mechanical Frames Have The Ability To Break Down Which Decreases Their Volume.   Break-down frames Are Statically Determinant Which Means You Add Little or No Increase in Strength from the Joint Fixivity.   Mechanical Frames Are Heavier By the Weight of the Joints; Usually 10% for the Rowframe Variety.

Welded Frames Are Statically In-determinant which means the Frame Increases in Strength from the Joints.  Generally, Welded Frames Occupy More Space.   Welded Frames have Annealed Joints Unless the Fabricator Heat Treats the Frame.  Small frame Segments Are Inexpensive to Heat Treat While Large Frames May not be feasible. 

Many in the industry imply that mechanical (modular frames ) are superior to welded frames.  This is a false statement.  The concept is to lure you away from companies absent talent to perform said weldments.  Paying welders more than cashiers forms the basis of the resistance.  Know it for what it is.  Oh, there is also the commie thing.  Commies don't export welded frames because they are volumetrically inferior.  If thay cannot stuff 4000 of them into a shipping container, the model fails economically.