TechDraw WeldSymbol

From FreeCAD Documentation
Revision as of 13:25, 8 December 2019 by David69 (talk | contribs)
Jump to navigation Jump to search
Other languages:
Deutsch • ‎English • ‎français • ‎italiano
Arrow-left.svg Previous: Techdraw-showall.svg ShowAll

Techdraw-weldsymbol.svg TechDraw WeldingSymbol

Menu location
TechDraw → Add Welding...
Default shortcut
Introduced in version
See also
TechDraw LeaderLine


The WeldingSymbol tool adds welding specifications to an existing leader line.

TechDraw WeldingSymbol example.png

Welding specification added to a leader line

How to use

  1. Select an existing Techdraw-mline.svg LeaderLine
  2. Press the Techdraw-weldsymbol.svg WeldingSymbol button
  3. A Task dialog will open. The dialog allows entry/selection of individual welding symbols and accompanying text to be added to the leader line.
  4. To exit the dialog and save changes, press the OK button.
  5. To exit the dialog without saving, press the Cancel button.
  6. After the welding symbol is created, it can be edited by double clicking the WeldingSymbol in the Tree.


  • DataAllAround: Show the AllAround symbol (circle) at the kink in the leader line.
  • DataFieldWeld: Show the FieldWeld symbol (flag) at the kink in the leader line.
  • DataAlternateWeld: Offset the lower symbol to indicate alternating welds.
  • DataTailText: Text to be shown at the end of the leader line.

Each individual symbol ("arrow side" and "other side") is represented by a "tile" object. A WeldingSymbol has 1 or 2 tiles associated with it.

  • DataRow: 0 for above the line, -1 for below the line. Not intended for end users.
  • DataColumn: not implemented.
  • DataSymbolFile: Directory and file name of the svg file for the symbol.
  • DataLeftText: Text to be displayed to the left of the svg symbol.
  • DataCenterText: Text to be displayed above/below the svg symbol.
  • DataRightText: Text to be displayed to the right of the svg symbol.


See also: TechDraw API and FreeCAD Scripting Basics.

The WeldingSymbol tool can be used in macros and from the Python console by using the following functions:

symbolName = "DrawWeldSymbol001")
symbolType = "TechDraw::DrawWeldSymbol"
App.activeDocument().addObject(symbolType, symbolName)
App.activeDocument().DrawWeldSymbol001.Leader = myLeader
App.activeDocument().DrawWeldSymbol001.AllAround = True
App.activeDocument().DrawWeldSymbol001.FieldWeld = True
App.activeDocument().DrawWeldSymbol001.AlternatingWeld = True
App.activeDocument().DrawWeldSymbol001.TailText = "process text"

tileName = "DrawTileWeld001"
tileType = "TechDraw::DrawTileWeld"
App.activeDocument().addObject(tileType, tileName)
App.activeDocument().DrawTileWeld001.TileParent = App.activeDocument().DrawWeldSymbol001
App.activeDocument().DrawTileWeld001.TileRow = 0
App.activeDocument().DrawTileWeld001.TileColumn = 0
App.activeDocument().DrawTileWeld001.SymbolFile = fullPathToMySvgFile
App.activeDocument().DrawTileWeld001.LeftText = "left text"
App.activeDocument().DrawTileWeld001.RightText = "right text"
App.activeDocument().DrawTileWeld001.CenterText = "center text"

Svg Symbol Tiles

  • Individual symbols are formed by 64x64 pixel Svg files. Additional symbols can be created in an Svg program like Inkscape using one of the supplies symbols as a template.

  • Individual symbols are formed by 64x64 (nominal) pixel Svg files. The tiles actually have a "border" of 4px. The border ensures that the leader line and symbol meet nicely.
  • The symbol is drawn in black on a transparent background. The stroke is 0.5mm.
  • The leader passes below symbols for the arrow side and above symbols for the "other" side.
  • There is no particular naming standard other than to append "Up/Down" to the arrow/other side symbols where required.


  • You can edit your WeldingSymbol by double clicking on it in the tree view. Double clicking in the graphics area is not yet supported.
  • There is a preference parameter for the default welding symbol directory. You can add your own symbols in a personal directory.
Arrow-left.svg Previous: Techdraw-showall.svg ShowAll