Welding the Pt DPH Materials
The Pt DPH materials are characterized by exceptionally good weldability. They can be welded using all stand ard techniques including tungsten inert gas (TIG), laser and electron beam welding.
In many instances it is possible to weld the Pt DPH materials without the use of filler metal. A remarkable feature of these welds is the high strength which is maintained after welding. Usually the strength of oxide dispersion strengthened materials decreases to that of the unstrengthened conventional alloy on welding because the quantity of dispersed oxide phase is reduced in the weld zone. However, the strength of the Pt DPH materials is largely maintained after welding and is considerably higher than that of the conventional, non-dispersion strengthened alloy.
If the use of filler metal is necessary, we have a number of products available which permit the weld strength to be optimized. We are pleased to advise our customers on the best solution.
Microstructure of a TIG Weld Seam in Pt-10%Rh DPH
Cross-section through unaffected sheet, heat-affected zone and fusion zone.
Detail of microstructure in unaffected sheet, heat-affected zone and fusion zone (from left to right). The oxide dispersion is still present in the heat-affected zone and fusion zone.
High Temperature Stress-Rupture Strength of Welded Pt-10%Rh DPH
In many instances it is possible to weld the Pt DPH materials without the use of filler metal. The following table shows the 100 h stress-rupture strength of Pt-10%Rh DPH after butt welding without filler metal. The tungsten inert gas (TIG) technique has been used. For compar ison, the strength of the unwelded Pt-10%Rh DPH is shown together with the strength of the conventional, non-oxide dispersion strengthened alloy Pt-10%Rh.
We reserve the right to make technical alterations as necessary. The data contained in this material data sheet have been obtained at Heraeus under laboratory conditions to the best of Heraeus’ knowledge and under observance of the latest state of the art. However, Heraeus does not assume any responsibility for the correctness and completeness of these data or any responsibility that the respective user will obtain the same data under its concrete conditions. Each user shall examine on its own responsibility whether the products of Heraeus are suited also under its own conditions of use and for its own intended purpose of use.
The data given here are correct as of October 2008. We reserve the right to make technical alterations as necessary.
