Ads
related to: www.impact iron working
Search results
Results From The WOW.Com Content Network
The Ironworker Management Progressive Action Cooperative Trust (IMPACT) is a joint, labor-management, non-profit trust formed under Section 302(c) (9) of Labor-Management Relations (Taft-Hartley) Act which includes contributing Local Unions of the International Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers and their signatory contractors.
Iron and copper working in Sub-Saharan Africa spread south and east from Central Africa in conjunction with the Bantu expansion, from the Cameroon region to the African Great Lakes in the 3rd century BC, reaching the Cape around 400 AD. [15] However, iron working may have been practiced in central Africa as early as the 3rd millennium BC. [79]
When the Iron Workers struck in response, the employers obtained injunctions and local ordinances that barred picketing or limited it to an ineffective display. Open shop demands still exist today. Non-union iron-working companies are in competition to take over union jobs, but the non-union hourly wage is based on the union rate.
However, concave iron ore mirrors were apparently used for firing and optical purposes by the Olmec (1500–400 BCE) and Chavin (900–300 BCE) cultures, [33] and ilmenite "beads" may have served as hammers for fine work. [34] The Olmec and Izapa (300 BCE – 100 CE) also seem to have used iron magnetism to align and position monuments. [35]
Work hardening, also known as strain hardening, is the process by which a material's load-bearing capacity (strength) increases during plastic (permanent) deformation. This characteristic is what sets ductile materials apart from brittle materials. [1] Work hardening may be desirable, undesirable, or inconsequential, depending on the application.
Iron metallurgy in Africa concerns the origin and development of ferrous metallurgy on the African continent.Whereas the development of iron metallurgy in North Africa and the Horn closely mirrors that of the Ancient Near East and Mediterranean region, the three-age system is ill-suited to Sub-Saharan Africa, where copper metallurgy generally does not precede iron working. [1]
The most egregious example is the plan for an Iron Dome system over America. This effort could cost as much as $100 billion annually through 2030; its total cost has been estimated at $2.5 trillion.
Iron meteorites consist overwhelmingly of nickel-iron alloys. The metal taken from these meteorites is known as meteoric iron and was one of the earliest sources of usable iron available to humans. Iron was extracted from iron–nickel alloys, which comprise about 6% of all meteorites that fall on the Earth.