To Change Seam Settings
Use the Seam page of the Sheetmetal Preferences dialog box to set default seam preferences.
1. Click > > 
Model Properties. The Model Properties dialog box opens.
Model Properties. The Model Properties dialog box opens.2. Under Sheetmetal, click change in the Seam line. The Sheetmetal Preferences dialog box opens to the Seam page.
 | Alternatively, you can select a body in the Model Tree, right-click and select  Preferences. The Sheetmetal Preferences dialog box opens to the General page. |
3. Select the part or a body from the list at the left. By default the part is selected.
4. To change the value of the gap setting, under Gap Settings type a new value in the Gap value box or select one of the following options from the list:
◦ Thickness—Uses a default radius equal to the thickness of the sheet metal wall.
◦ 0.5 * Thickness—Uses a default radius equal to half the thickness of the sheet metal wall.
◦ 2.0 * Thickness—Uses a default radius equal to twice the thickness of the sheet metal wall.
◦ Gap—Uses a default radius equal to the value set for the SMT_GAP parameter.
5. To change the seam type, under Seam Settings select a different type from the Type list:
◦ Open—Creates an open edge rip.
| | An open type of edge rip is applicable only for a concave vertex. |
◦ Gap—Creates a gap along the edge rip according to a specified dimension.
◦ Blind—Creates a blind edge rip according to a specified dimension.
◦ Overlap—Creates an overlapping edge rip.
6. To change the seam width, type a new value in the Width box or select Gap to create the corner treatment with a width equal to the value set for the SMT_GAP parameter.
7. Click OK. The model regenerates using the new settings.