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Encyclopedia > Forge welding

Forge welding is a welding process of heating two or more pieces of wrought iron or steel until their surfaces are malleable and then hammering them together. Its use is ancient, doubtlessly being the first method devised for the joining of metals. Until the invention of electical and gas welding methods during the Industrial Revolution, it was the only available method. Welding is a fabrication process that joins materials, usually metals or thermoplastics, by causing coalescence. ... Wrought iron is a very pure form of commercial iron, having a very small carbon content. ... Steel framework Steel is a metal alloy whose major component is iron, with carbon being the primary alloying material. ... The Industrial Revolution is the name given to the massive social, economic and technological change in 18th century and 19th century Great Britain. ...

Often a flux is used to keep the welding surfaces from oxidizing and producing a poor quality weld. The flux also mixes with the oxides that do form and lowers the melting temperature and the viscosity of the oxides. This enables the oxides to flow out of the joint when the two pieces are beaten together. A simple flux can be made from borax, sometimes with the addition of iron filings. In metallurgy Flux is an aid to melting; a material which by its chemical action facilitates soldering or brazing of metals. ... The Pitch Drop Experiment at the University of Queensland. ... Borax, (Na2B4O7·10H2O, sodium borate or sodium tetraborate) is an important boron compound. ...

The welding temperature is above the forging temperature, and not so very far away from the melting point of the metal. Steel welds at a lower temperature than iron. The metal may take on a glossy, or wet, appearance at the welding temperature. Care must be taken to avoid "burning" the metal, which is overheating to the point that it gives off sparks from rapid oxidation. Steel framework Steel is a metal alloy whose major component is iron, with carbon being the primary alloying material. ... General Name, Symbol, Number iron, Fe, 26 Chemical series transition metal Group, Period, Block 8 (VIIIB), 4, d Density, Hardness 7874 kg/m3, 4. ... A spark may be a small airborne ember from a fire. ...

Multiple layers of different kinds of iron and steel can be forge welded together to produce pattern welded or Damascus steel. A similar process is used to produce the blade of a katana. Pattern welded pocket knife Pattern welding is the practice in sword and knife making of hammering out the metal, folding it over, and welding the metal piece back onto itself. ... Damascus steel is a type of steel alloy that is both strong and malleable, a material that is perfect for the building of swords. ... The katana (刀) is the Japanese sabre or longsword (大刀 daitō), although many Japanese use this word generically as a catch-all word for sword. ...

  Results from FactBites:
Forge welding - Wikipedia, the free encyclopedia (361 words)
Forge welding is a welding process of heating two or more pieces metal and then hammering them together.
Forge welding between similar materials is caused by solid-state diffusion.
Forge welding between dissimilar materials is caused by the formation of a lower melting temperature eutectic between the materials.
Welding - MSN Encarta (588 words)
Welding processes are generally classified according to the sources of heat and pressure used.
The surfaces to be welded and the welding rod are coated with flux, a fusible material that shields the material from air, which would result in a defective weld.
In shielded metal-arc welding, a metallic electrode, which conducts electricity, is coated with flux and connected to a source of electric current.
  More results at FactBites »



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