I read two articles today, "Silicon Valley is struggling to understand Tesla's Model 3 production problems — here's why" that is referring to article in Automotive News that is supposing that Tesla is having issues spot welding steel):
I looked up youtube videos of robotic spot welding and they all have sparks flying (expulsion):
Vovo:
Toyota:
BMW:
Tesla:
Instagram post by Elon Musk • Oct 8, 2017 at 10:20pm UTC
"Resistance welding should make a little smoke, but when you see stuff popping out like that, that's called expulsion," automotive manufacturing consultant Michael Tracy of Agile Group in Howell, Mich., said of the first video. "It's symptomatic of weld spots getting too hot because they're poorly planned, or in this case, the metal not being pulled all the way together."
I looked up youtube videos of robotic spot welding and they all have sparks flying (expulsion):
Vovo:
Toyota:
BMW:
Tesla:
Instagram post by Elon Musk • Oct 8, 2017 at 10:20pm UTC