Tylecote 1954 oxide-to-metal hardness data

I wanted to talk about metals and what metals are easiest to cold weld. There's a guy Tylecote who back in 1954 in the British Welding Journal did some studies on what metals are easiest to cold bond, basically with just normal compression hardness where you're extruding things out — you don't have a lot of shear. He found that with indium, he only needed a 10% deformation of two indium pieces before he could get a fairly strong bond. There's data on this in your notes that I handed out. Aluminum is the next easiest, then tin, and then you get down to more structural materials like iron and copper. Indium is by far and away the easiest material to cold bond by just squeezing it together.