How Do You Weld Lines in Sketchup?

Welding lines in Sketchup is a useful technique that allows you to join separate line segments into a single continuous line. This can be particularly helpful when working on complex 3D models or when you need to create clean and precise outlines for your designs. In this tutorial, we will explore how to weld lines in Sketchup using a few simple steps.

Step 1: Drawing the Lines

To begin, open Sketchup and start by drawing the individual line segments that you want to weld together. You can use the Line tool from the toolbar or activate it by pressing the ‘L’ key on your keyboard. Draw each line segment separately, making sure they are not connected or intersecting at this stage.

Step 2: Selecting the Lines

Once you have drawn all the necessary line segments, select them individually by clicking on each one while holding down the Shift key. Alternatively, you can also drag a selection box around all the lines to select them at once.

Step 3: Accessing the Weld Extension

To weld the selected lines together, we will use an extension called “Weld”. If you don’t have this extension installed, you can easily download it from the Sketchup Extension Warehouse. Once installed, go to the “Extensions” menu at the top of Sketchup’s interface and select “Weld” from the dropdown list.

Step 4: Applying Weld

After selecting “Weld”, a dialog box will appear with some options for adjusting the welding process. For most cases, you can leave these settings as they are and click on “Weld” to apply it. The extension will automatically join all selected lines into a single continuous line.


It’s important to note that the Weld extension works only with line segments that are collinear, meaning they are on the same straight line. If you try to weld lines that are not collinear, Sketchup will show an error message.

Step 5: Verifying the Result

After applying the weld, you should see that all selected lines have been joined into a single continuous line. To verify this, use the Select tool and click on different parts of the newly welded line. You will notice that the entire line is now treated as a single entity and can be manipulated as such.

Step 6: Further Editing

Once the lines are welded, you can continue editing them as needed. For example, you can use the Move tool to adjust their position or the Erase tool to remove any unwanted segments. The welded line will maintain its continuity even after these edits.


In conclusion, welding lines in Sketchup is a simple process that allows you to create seamless and clean outlines for your designs. By following these steps and using the Weld extension, you can easily join separate line segments into a single continuous line in Sketchup. This technique is especially useful when working on complex 3D models or when precision is required for your designs.

  • Tips:
    • Selecting multiple lines: To select multiple lines at once, hold down Shift and click on each line individually or drag a selection box around them.
    • Installing extensions: If you are unfamiliar with installing extensions in Sketchup, refer to Sketchup’s official documentation or online tutorials for step-by-step instructions.

I hope this tutorial has been helpful in teaching you how to weld lines in Sketchup. Happy designing!