Welding iron

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In the course of history, welding iron has referred to two different types of iron or steel.

  • In the period before 1900, the term welding iron referred to the wrought iron produced using the puddling process , which was created from multiple rolling together of flat iron strips ( welding ). When used in building structures, it was riveted because the welding that is common today has not yet been invented and the welding iron of that time (just like the early steel) was not suitable for the welding that is common today. The steels produced in the Bessemer process from around 1860 and in the Thomas process from the 1880s were referred to as mild iron or mild steel .
  • After 1900, more precisely after the invention of the welding torch and the industrial development of welding after the First World War , the term welding iron denoted steels with a low carbon content (C <0.22%) and very low sulfur and phosphorus contents , which are autogenous (with the Flame in the melting process) or electrically welded . Mainly types of steel comparable to today's structural steels with a strength of approx. 270 N / mm² or unalloyed steels were used.

Due to the now very small number of non-weldable steels, the declaration of weldability through the name no longer makes sense. Welding irons and welded steel are currently only used in connection with historical documents.

literature

  • Ernst Hermann Schulz: About the material of the welding iron age. Verlag Stahleisen, Düsseldorf 1955, OCLC 73645806 .

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