Originally Posted by
unterhausen
You quoted a spammer. How's that frame holding up?
I didn't read through the thread to see if I knew this back in 2010, but some recumbent manufacturers use MIG. I think it's mostly for thick section materials and they use more conventional processes for most of the frame.
A lot of low-end Walmart style bikes are MIG welded, sometimes by robots probably. Probably 1mm wall rolled up mild steel tubing.