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Re: [MW:35739] Bend Test and Tensile Test failed for ET45 Micro Welded Coupon

By Materials & Welding

For welding ET 45 Micro (GX45NiCrSiNb35-45), the typical procedure involves using a nickel-based filler metal like UTPA 3545Nb 

(as Mr. Mahesh recommended) or its equivalent CEWELD 3545 Nb (both are classified under EN ISO 14343-A standards) and 

designed for welding Ni-Cr-Nb-Si based high-temperature cast alloys.  

Generally, no preheat or PWHT is required for ET 45 Micro, but it should be welded with controlled heat input and limited interpass 

temperature (monitored properly) around max 150°C. Preheat may be applied if welding thick sections or to reduce residual stress, 

but it must be confirmed with field testing. 

C Sridhar.

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On Sat, 26 Jul 2025 at 15:34, ROHAN SONI <sonirohan94@gmail.com> wrote:
Dear Team, 

I am working on a material called ET45 micro (GX45NiCrSiNb45-35 Material) 

Elongation is 3 to 5℅
Tensile stength -450 Mpa
Consumable- ERNICRMO-3 

Due to such lower Elongation material shows brittle fracture and immediately failed from HAZ. 

During tensile testing it is failed from Where it holds from base metal. 

Kindly provide the solution for this that how can i comply the PQR testing. 

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