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Yes you can. However, if your WPS states that the filler metal per essential variable QW-404.5, will meet the Table QW-422 A-No. 1 chemistry limits, you will have to note that the Mn and Si must be 1.60 and 1.0 or less respectively. You need to do incorporate this restriction as the SFA classification permits ER70-S6 to exceed the A-No. 1 limits
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Enough already. Assuming that only ASME Section IX applies; i.e. you are designing and fabricating per ASME I, VIII, B31.1 etc.
OK, just for grins, let’s take a look at GTAW Essential variable QW-404.5, “A change in A-Number”, at least in part.
“QW-404.5 (Applicable only to ferrous metals.) A change in the chemical composition of the weld deposit from one A‐Number to any other A‐Number in Table QW-442. Qualification with A‐No. 1 shall qualify for A‐No. 2 and vice versa. The weld metal chemical composition may be deter-mined by any of the following:
(a) For all welding processes —from the chemical analysis of the weld deposit taken from the procedure qualification test coupon.
(b) For SMAW, GTAW, LBW, and PAW — from the chemical analysis of the weld deposit prepared according to the filler metal specification, or from the chemical composition as reported either in the filler metal specification or the manufacturer’s or supplier’s certificate of compliance. . . . “
The A-Number may be assigned by the filler metal specification BUT it is not necessary to. The A-Number can also be determined on the basis of the actual weld deposit chemistry. Hence, if you specify that your ER70S-6 must comply with the A-Number 1 chemistry limits (and you actually do so) then absolutely, yes, you may substitute the ER70S-6 for ER70S-2.
This clearly is wholly separate from any other specifications applied by the customer which may impose additional limits on variables not controlled by ASME.
Enjoy.
From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Kannayeram Gnanapandithan
Sent: Friday, June 07, 2019 3:42 AM
To: materials-welding
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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.
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