Blacksmith or forge welding depends on the properties of the weld metal and the heating temperature. The higher the heat, the less pressure is needed precipitation. Sediment can be done manually or mechanically seats forging - pressing, rolling. In this way, can be obtained, for example, multi-layer sheet steel. Similarly, the bimetal manufactured by a joint-rolling the heated workpieces, such as steel, nickel, carbon steel and stainless steel or copper, etc.
When welding blacksmiths always quite likely clears the oxides, scale and other contaminants on the surfaces of the metal to be welded. Heating to a plastic state does not provide removal of contaminants in the sediments, especially in large scale cross-sections of welding. Therefore, to improve the reliability of welding blacksmiths seek to increase the contact surface between the joined parts, to this end, the surface prior to welding appropriately prepared and cut (see Fig.).
If the deposit is made, for example, forging such a way that it reduces the cross section of a metal welding place, the resort to pre-landing of connected parts. Despite the relative simplicity of the process and the lack of consumption of scarce materials, blacksmith welding is now seldom used, going by the wayside, giving way to modern, more sophisticated and productive ways of welding.
Significant deficiencies of blacksmith welding are: slow heating of the metal and, therefore, the low productivity of the process, the complexity of the precipitation process, requiring considerable skill workers, the lack of reliability of the resulting weld. To this is added the possibility of significant grain growth, overheating and burnout of the metal due to the length of the heating process. Low productivity makes blacksmith welding expensive and weld strength is obtained by low and fluctuates widely. These reasons explain the gradual replacement of blacksmith welding in the modern workplace.
A variety of blacksmith welding are ways in which the product is to heat is not placed in a special oven, and place of special welding heat welding torches. The method of this kind is the diffusion welding. Place welding may be cheaper to heat industrial gases, combusted in a mixture with air in a special burner. For the burners should sedimentary unit in the form of hammers, producing forging seam roller mill, roller welding, rolling along the seam, producing draft and carry out such welding parts, mostly steel sheets.
There are industries where forge welding now maintains a leading position, such as the production of welded gas pipes, mostly small diameter, no greater than 100 mm. The bands were heated in a furnace, then heated with system band at the end of the mandrel is pulled through a drawing at a rate of several tens of meters per minute, folding the strip into a tube and welding the longitudinal seam. The production of such tubes is massive, and they are produced by thousands of miles for gas, water networks, etc.
Furnacemen retained value in the production of welding different components of the carpentry tools and tool carbon steel (axes, crowbars, picks, etc.).
See also:
Blacksmith (Forge) Welding
Blacksmith (Forge) Welding Part 2
Induction (high frequency) Welding
Diffusion Welding
Casting or Foundry Welding
Friction Welding
Electrolytic Welding
Welding Under Water
Explosive Welding
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