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Re: [MW:34493] Re: ER70S-2 and ER70S-6 (GTAW Process)

By Materials & Welding

Due to triple deoxidizers present in the filler, the ER70S-2 wire is much more suited to weld on rusted surfaces 

compared to ER70S-6. Rust, which is an iron oxide, will react very fast with Ti, Zr, or Al to form their oxides, such 

as TiO2 or ZrO2 or Al2O3 thus the Mn will be saved. Mn provides strength and toughness to the weldment. So, 

any loss of Mn from the weld deposit will actually reduce the strength of the weld metal.

 

Loss of silicon will make the weld pool sluggish and can result in a poor weld bead appearance. There is no 

difference between ER 70S-6 and ER 70S-2 based on the mechanical properties, as both have 70ksi Tensile 

strength and 58 Ksi Yield strength. Both wires provide equal minimum specified tensile strength, yield strength, 

ductility, and toughness values.

  

ER 70S-6 is a solid TIG rod that is used for general-purpose welding. It can be used on MS, CS and LA  steels.

ER 70S-2 is available in 0.80 to 3.20 mm sizes, whereas ER 70S0-6 is available mostly in 0.80 to 2.00 mm sizes. 

Make a mock-up weld and see whether it meets X-ray qualified welds and check the mechanical properties prior 

to any further action.

 

C Sridhar.

  


On Wed, 16 Aug 2023 at 14:22, Vishwas Keskar Welding Manager WELDING <vvkeskar123@gmail.com> wrote:

You can write ER70S-6 with a note in WPS that :

Mn content shall not exceed 1.6 % 
Si content shall not exceed 1.0 % 

Thanks
VIshwas - IWE 




On Monday, June 3, 2019 at 7:48:39 PM UTC+5:30 K K wrote:
Dear All,

My PQR is qualified with ER70S-2.

Can I use ( Mention) ER70S-6 in WPS.

Regards
Kiran

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