Bend Test and Tensile Test failed for ET45 Micro Welded Coupon

[ROHAN SONI]

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. 

[mahesh chilukamari]

Hi ,

 We have worked on same material but fillers seems incorrect ,may be you try with UTPA 3545nb.

And bent test you can’t proceed similar as normal material as it’s having low ductility . 

Best regards 

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[ROHAN SONI]

Dear mahesh, 

Can you provide more details regarding testing.... 

Can you share the pqr with me for reference? 

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[Prakash Hegde]

Hi

As its %elongation is very low 

Better try buttering on jt surrace with ductile consumable like pure Ni i. E Ni1

And later weld jt with compatable UTS consumable 

While bend test use 3mm thk with 6t or above former with slow loading

Regards

Hegde P. B

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[sridhar cn]

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 <sonir...@gmail.com> wrote:

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