No, dropping a 5-lb hammer from any height is not going to damage properly set porcelain tiles. I've dropped MUCH heavier stuff on my ceramic tile (like a Wilton vice falling off of a workbench). I've rolled 500# engines over it perched on floor jacks. In the video that's been shown, I'm not dropping a hammer, I'm HITTING the tiles with a sledge hammer hard enough to make the camera (that's sitting a few feet away) jump on the concrete.
Tile is about on par with concrete for welding slag, which is to say you'll leave tiny burn marks -- which shouldn't bother anyone with a working shop. I weld all the time in my garage. I've found that grinding (sometimes) generates more, widespread slag. If it's clear I'm going to be leaving a lot of molten metal beneath me, I'll put down a welding blanket.
Tile is about on par with concrete for welding slag, which is to say you'll leave tiny burn marks -- which shouldn't bother anyone with a working shop. I weld all the time in my garage. I've found that grinding (sometimes) generates more, widespread slag. If it's clear I'm going to be leaving a lot of molten metal beneath me, I'll put down a welding blanket.
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