Archive for the ‘Welding Brazing and Soldering’ Category
Monday, December 31st, 2007
Brazing is a group of welding processes which produce coalescence of materials by heating them to a suitable temperature and by using a filler metal having a liquidus above 450oC and below the solidus of the base metals.Filler materials for brazing are covered by an AWS specification. They are classified ...
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Friday, March 24th, 2006
Precipitation or age hardening was discovered by Alfred Wilm in Germany in 1906. He attempted to harden an alloy of essentially aluminum-2 atom percent copper in an analogous way to steels by a quenching treatment. The specimen was initially soft, but the hardness increased with time at room temperature after ...
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Friday, March 24th, 2006
Welding Aluminum Alloys
The unique combination of light weight and relatively high strength makes aluminum the second most popular metal that is welded. Aluminum is not difficult to join but aluminum welding is different from welding steels.Aluminum possesses a number of properties that make welding it different ...
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Friday, March 24th, 2006
Solid state welding is a group of welding processes which produces coalescence at temperatures essentially below the melting point of the base materials being joined, without the addition of brazing filler metal. Pressure may or may not be used. These processes are sometimes erroneously called solid ...
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Friday, March 24th, 2006
The reactive and refractory metals were originally used in the aerospace industry and are now being welded for more and more requirements. These metals share many common welding problems and are, therefore, grouped together.
Reactive metals have a strong affinity for oxygen and nitrogen at elevated temperatures and ...
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Friday, March 24th, 2006
Soldering is a group of joining processes which produces coalescence of material by heating them to a suitable temperature and by using a filler metal having a liquidus not exceeding 450oC and below the solidus of the base metals.
The filler metal is distributed between the closely fitted ...
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Friday, March 24th, 2006
Brazing is a group of welding processes which produce coalescence of materials by heating them to a suitable temperature and by using a filler metal having a liquidus above 450oC and below the solidus of the base metals. The solidus is the highest temperature at which the ...
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Friday, March 24th, 2006
Magnesium alloys containing small amounts of aluminum, manganese, zinc, zirconium, etc., have strength equaling that of mild steels. They can be rolled into plate, shapes, and strip. Magnesium can be cast, forged, fabricated, and machined.
As a structural metal it is used in aircraft. It is used by ...
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Friday, March 24th, 2006
his article focuses on the fabrication and welding of nickel alloys as they relate to the welders and production personnel engaged in fabrication of nickel alloys for corrosion service.The physical properties of solid solution nickel alloys, nickel and nickel-copper solid solutions alloys, chromium-bearing solid solutions alloys, nickel-molybdenum ...
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Friday, March 24th, 2006
The nickel-chromium-molybdenum alloys (Hastelloy alloy C) proved to be extremely important in the chemical processing industry, because they provided corrosion resistance over a wide range of reducing and oxidizing environments. However, grain precipitation of carbides in the as-welded condition required a postweld solution heat treatment to restore optimum corrosion resistance.
An ...
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