LESSON 4.5 · 2:01 · CHAPTER 4 · LAYER TIME AND THE WELD
The interface is the average
When a hot bead lands, the joint jumps to roughly the mean of the bead and the substrate temperatures, so the substrate matters as much as the nozzle.
Predict · at 0:36 in the video
A 250 degree bead lands on a 90 degree wall, and then on a 140 degree wall. What's the joint temperature each time?
About 170 degrees, and about 195. Halfway each time. And by last lesson's equation, chains at 195 move about ten times faster than at 170.
Further reading
This course is our own. These books go deeper.
- The economics of Big Area Additive Manufacturing, Post et al., Solid Freeform Fabrication Symposium, 2016
- Additively manufactured carbon fibre-reinforced composites: state of the art and perspective, van de Werken et al., Composites Part A, 2020
About the numbers
Simulations in this lesson are our own. Where a number rests on an assumption or a single source, the video marks it with an asterisk and says where it comes from.
Up next · 4.6 · 1:56Infrared heats a skin