Update README.md

README.md

@@ -45,6 +45,15 @@ https://www.youtube.com/watch?v=dS5kwdaNhZo
 * Roller
 <img src='img/mmvv-sequence-small.mp4' width=800px> 
 
+### Closing seams
+
+* welding
+* spot welding
+* rivets
+* sheet metal inserts
+* tabs and slots
+* adhesives
+
 
 ### Design Factors