Structural Members

You have a sketch. You activate Insert > Weldments > Structural Member. You select the sketch lines. SOLIDWORKS either throws an error, silently omits some lines from the resulting bodies, or lets you finish — and the solid bodies pass through each other at every joint without trimming. None of these outcomes produces a clear error message that names the actual cause. This post covers every root cause and the diagnostic sequence to isolate which one is killing your structural members. ...

Every SOLIDWORKS weldment tutorial starts with “Insert Structural Member” and assumes the profile library is already populated. It never explains where those profiles actually live, what format they use, or what to do when the profile you need isn’t there. If you’re trying to automate weldment creation via a VBA macro, the API reference assumes you already have the profile path, which means you need to know the folder structure before you can write a single line of code. ...

A fabricator running a CNC tube laser — Trumpf TruLaser Tube, BLM LT-Free, Mazak FT-150 — expects the DXF cope geometry to land flush against the mating tube. When it doesn’t, someone grinds. When it really doesn’t, the joint gets welded with a visible gap, weakening the bead and failing inspection. The problem starts in SolidWorks before the export ever happens. How SolidWorks Models Weldment Tubes The SolidWorks Weldment feature builds structural members by sweeping a 2D profile sketch along a 3D path. The profile is constant — it maintains its exact shape and size throughout the entire sweep. When two members intersect, SolidWorks trims them automatically to create the cope (the curved notch that allows one tube to seat against another). ...