Iron iron


Like other metals, iron and iron alloys can be soldered. What is to be considered when soldering iron and what soldering or soldering techniques there are, we have described in this guide for you.

General about iron

Iron in its pure form will rarely meet you. If anything, they are mostly magnets. Instead, you will already have iron pretreated or as part of an alloy in front of you:

  • Cast iron, cast iron (very high carbon content)
  • Wrought iron (low carbon content)
  • Steel alloys with iron (different carbon content)

Welding and brazing of iron

When joining, a distinction must be made between different methods. Following are the typical methods of thermal joining:

  • Soft soldering (up to 450 degrees Celsius)
  • Brazing (from 450 to 1,200 degrees)
  • High temperature brazing (HTL or HT brazing, from 900 degrees)
  • welding

Iron welding

The welding of iron works only very limited. Due to the high carbon content, raw and cast iron workpieces are virtually non-weldable.

Brazing iron

Here soldering is used. So if you want to "fix" an iron casting again, brazing might work. In addition to a silver solder but also expertise is needed, not to forget the experience, because the casting must not liquefy. In addition, there is a considerable risk that the workpiece (for example, an engine block) warps due to the effect of heat).

The soldering of iron

The soldering of iron alloys and wrought iron, however, is relatively simple. However, the iron workpiece must be prepared. First, the iron is etched. Then you have to clean the iron, so that it can not come to corrosion. Also, grease from fingerprints needs to be removed.

The solder when soldering iron

For galvanized iron you must first remove the zinc layer. It is recommended to grind the iron. Afterwards you can solder the iron workpiece.

Flux for iron soldering

Make sure that the solder meets the requirements for welding iron. Especially important in alloys is the flux, so as to prevent the formation of an oxide layer on the alloy. Due to the many and varied properties that iron gets in the different alloys, there can not be given a blanket answer which Lost is to use.

Tips & Tricks

In addition, different soldering methods are used. So you can solder electrically with a soldering iron or with a gas burner (blowtorch). When brazing iron with an iron braze, it is also important to protect the processing area against corrosion. For this you can, for example, paint the iron.


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