Submerged arc welding.
<video controls autoplay loop style="max-width: 100%;">
<source src="https://diqn32j8nouaz.cloudfront.net/tooltalk_17615271640689.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
Previously:
Laser welder - GIF
Plastic welder from soldering iron - GIF
Rotary weld positioner table - video
Spot welder - video
Welded Celtic knot
