Solder platinum

Soldering covers a wide temperature range. At the top it is completed with the soldering of platinum. The hard precious metal is ideal for welding and requires good soldering. What should be considered when soldering platinum is summarized below.

Soldering, melting, casting - more and more amateurs are enthusiastic about it

Especially as jewelry platinum is popular. Handyman and hobbyists are increasingly beginning to use methods that were previously only available to craft businesses. Be it the melting and casting of bronze, copper or other metals.

The gilding, galvanizing or, for example, copper plating of aluminum is finding more and more lay followers. Not least the chrome plating.

The demanding soldering of platinum

A special highlight is the soldering of platinum. The soldering of platinum takes place at temperatures around 1,100 degrees. This makes it possible to precisely assign the soldering of platinum:

  • the soldering to 450 degrees
  • the brazing from 450 degrees
  • HTL high temperature brazing from 800 to 900 degrees

Although soldering of platinum actually falls into HTL soldering, it is usually referred to as brazing. When welding it is quite easy to create a silvery shiny weld. When soldering this looks a bit different, since the platinum must first be heated.

Platinum heated reacts violently - especially on carbon (C)

Then it has to be considered that hot platinum is quite reactionary. The contact with carbon is to be avoided, for example, as this can lead to carburizing the solder joint.

But at least the seam will be dark and is then clearly visible. This can even happen if a solder is used for soldering which is intended for a different than the present platinum alloy.

Platinum strengths for soldering and welding

In addition, platinum soldering should only be used if the material thickness is below 0.8 mm. When welding from about 1.0 mm, the alloy is placed in the joint and then melted down or melted down.

Flux in platinum soldering

In addition, no flux should be used for soldering platinum. However, this depends on the alloy and the solder. In order to prevent the already described carburizing and blackening, fine gold is often used as solder. In this case, then flux must be used. However, these must be without borate.

Preheat the platinum for soldering

In addition, the platinum must be heated in advance. Already the problem with the carbon has to be considered. Do not use clay or graphite, but use a ceramic crucible instead. You can also use bright firebricks to anneal the platinum.

Lote for platinum

During soldering, solders, also referred to as so-called investment materials, are used. Platinum should be gypsum and asbestos-free, phosphate-bound PT solders.

But you can also use white gold solders. Although these require a higher working temperature, but offer a much better strength - which is always problematic in the fundamental soldering of platinum).

Requirements for the burner: no acetylene!

At the burner for soldering (and also welding) of platinum are also made special demands because of the carbon. So platinum should not be soldered with acetylene. Instead, it is recommended to use oxyhydrogen gas, which is generated by means of a hydrostatic generator (gas generator). The burner flame should be set blue.

Tips & Tricks

Please keep in mind that the platinum is annealed and quenched before soldering or welding. This is used water (not ethanol alcohol). In addition, the platinum is to pickle before each drawing and rolling. Nitric acid is used for this purpose.

It always happens that beginners think that they can use silver as their lot. This does not work, but then the platinum is so stained with nitric acid, so that the silver (and other trapped substances) can dissolve).

Video Board: Platinum Soldering