Pile cage welding machine. These are for reinforced concrete piles for pile foundations. 2-minute video:
Previously:
Cold welding GIF
Friction welding drill pipe for oil exploration
Welded Celtic knot
Friction stir welding - GIF, video, and images
NASA Technical Publication: Can you weld on Mars?
Slow motion linear friction welding of titanium - GIF and video
Passivating welds with electrolytic cleaning - GIF and video
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