Weldments

A r/SolidWorks thread from August 2026 captures the confusion exactly: an engineer is trying to export a flat pattern DXF from a SolidWorks weldment to send to a tube laser shop. Every suggestion in the thread involves model edits, workarounds, or converting the weldment to sheet metal. Nobody points out the real issue — they are trying to apply a sheet metal export workflow to a part that belongs in a completely different machine category. ...

Your tube bender needs one number before they can key anything into the CNC machine: the developed length, also called the cut length — the stock length of straight tube that goes in and produces your bent part when it comes out. Give them the wrong number and you are either scrapping material or re-cutting after the fact. SolidWorks weldments give you a length. The question is what that length actually represents, and when it matches what the bender needs. ...

You’ve spent an hour adding custom properties to each cut list item — part numbers, supplier codes, cost-per-unit. You modify a structural member, hit Rebuild, and they’re gone. Not obviously corrupted. Just attached to the wrong items, or pointing at stale folders that no longer exist in the tree. This is the cut list auto-update problem, and it’s not a bug. It’s the expected behavior of a consolidation system that doesn’t know you cared about those specific folders. ...

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). ...

You have a sheet metal weldment with properly named cut list folders: meaningful names built from profile paths and custom properties, properly rolled up into your BOM. Then someone inserts that part into a parent weldment using Insert > Part, or you create a derived configuration that dissolves the cut list context — and every folder name silently reverts to “Sheet” or “Structural Member 1”. This is not a bug. It is a consequence of how SolidWorks tracks cut list folder identity, and understanding the mechanism tells you exactly which fix to apply in which scenario. ...

You build a steel frame as a weldment in one part file. Twelve identical 1500 mm long pieces of 50x50x3 square tube, plus eight 800 mm cross braces of the same profile. The cut list folder shows the right rollups: the long pieces grouped under one folder, the short pieces under another. The properties match. Then you drop the part into a parent assembly with a few other weldments, drop a BOM on the drawing, and the cut list items from the second weldment refuse to combine with the matching items from the first. Same profile. Same length. Same description. Different rows. ...

Every fabrication shop has a corner full of welding jigs. Custom fixtures built for a single assembly, used for a single production run, and then stored indefinitely because throwing away tooling feels wrong even when you know you’ll never use it again. SolidWorks’ Tab and Slot feature offers a fundamentally different approach: design the parts so they locate themselves. Instead of external fixtures holding components in alignment during welding, interlocking geometry cut directly into the sheet metal parts does the positioning for you. ...