Atomic Hydrogen Arc Welding

Atomic hydrogen welding is an arc welding process that makes use of hydrogen gas to surround and transfer heat from an arc to the base metal. An atomic hydrogen welding torch contains two tungsten metal electrodes that form the electric arc. Hydrogen gas (H2) is used...

Hertzian Contact Stress

Unusually high stresses may occur when a load is applied over a small area of contact. This phenomenon typically arises on a microscopic scale when a force is transmitted through two bodies in contact. Practical examples include contact of a wheel and a rail, valve...

Powder Metallurgy

Powder metallurgy (PM) is a relatively new manufacturing method, although there is some evidence it was practiced by ancient civilisations such as the Egyptians and the Incas. The technique, as we know it today, developed in the late nineteenth and early twentieth...

Drilling

Drilling is a very common operation used for making holes in a material. The tool used is called a drill or drill bit. The drill bit is made to rotate and moves into the material to form a hole. These tools can have high length to diameter ratios, thus allowing deep...