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Quenching hardens the metal so it holds an edge longer but this also makes it very brittle. To restore some ductility and durability the sword is tempered. With swords, due to their length, the challenge is greater as in a typical quenching it is possible to bend or warp the blade if it is not introduced to the quenchant smoothly and evenly.
Any foreign material in the weld, such as the oxides or "scale" that typically form in the fire, can weaken it and cause it to fail. Thus the mating surfaces to be joined must be kept clean. To this end a smith makes sure the fire is a reducing fire: a fire where, at the heart, there is a great deal of heat and very little oxygen.
Fire hardening is the process of removing moisture from wood, changing its structure and material properties, by charring it over or directly in a fire or a bed of coals. This has been thought to make a point, like that of a spear or arrow , or an edge, like that of a knife or axe , more durable and efficient for its use as a tool or weapon.
Para-aramids are used in many high-tech applications, such as aerospace and military applications, for "bullet-proof" body armor fabric. Both meta-aramid and para-aramid fiber can be used to make aramid paper. Aramid paper is used as electrical insulation materials and construction materials to make honeycomb core.
A clay vessel about 1.1 m (3 ft 7 in) tall, 3 m (10 ft) long, and 1.1 m (3 ft 7 in) wide is constructed. This is known as a tatara. After the clay tub has set, it is fired until dry. A charcoal fire is started from soft pine charcoal. Then the smelter will wait for the fire to reach the correct temperature.
Just Words. If you love Scrabble, you'll love the wonderful word game fun of Just Words. Play Just Words free online! By Masque Publishing
It is possible to enjoy the holidays while maintaining a healthy lifestyle, says Dr. Nicole Saphier. The Fox News medical contributor shares her tips for navigating the season in a nutritious way.
L.A. had the option to attempt a free kick after the fair catch. It was the rare instance in which it made sense because no time remained on the clock.