Heating the underside of a weld.




Previously:

Barrels explode after being welded together - GIF
Basket welding - GIFs
Bowling ball welding table - video
Busting fake internet welds - video
Friction stir welding - GIF, video, and images
Fuel tank welding fire - GIF
Railroad track thermite welding - video
Roll spot welding a mesh - GIF