Detailing And Working Drawings - Observation Sketch On Joinery Types

For this week task, we were required to observe and sketch based on 3 different types of joinery during our Singapore trip. But for those who are not going for Singapore trip are required to produce 6 different types of joinery for the observation journal. They are bolts and nuts, riveted and welded. It could based on furniture, building elements and so on. We went through quite lot of places, so it could not be a problem for us to get all those joinery. Here are my observation sketches:

 Joinery :  Bolts and Nuts 

 Joinery :  Riverted

Joinery :  Welded