Ferrit Tartalom a Korrozioallo Varratokban Schaeffler Diagram Es Wrc 1992 Diagram

8/10/2019 Ferrit Tartalom a Korrozioallo Varratokban Schaeffler Diagram Es Wrc 1992 Diagram

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Ferrite in weld metal: Schaeffler Diagram and WRC 1992 Constitution Diagram

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GENERALINFORMATIONS

Application of Ferrite Diagrams

The various ferrite diagrams are suitable to estimate the Ferrite Number in weld metal. Ongoing verifications indicate that the new

WRC 1992 Constitution Diagram provides the best estimate. The old Schaeffler diagram still provide useful information in a wide range

of weld metal compositions. It provides guidelines for dissimilar joints and welding clad steel, calculation of composition and position

of the diluted weld metal.

The following pages contain a reprint of a combination of the Schaeffler and the WRC 1992 Constitution Diagram (fig. 1) and the stan-

dard WRC 1992 Constitution Diagram on full scale (fig. 2). In using these diagrams for the estimation of weld metal structure, one

should always take into account the effects of different welding conditions (temperature/time-cycles, welding parameters, surface

effects) which usually influence FN values, compared with measurements on all weld metal deposit samples.

Fig. 1 Combined Schaeffler / WRC 1992 Constitution Diagram


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GENERALINFORMATIONS

Position of welding consumables

The position of representative Lincoln Electric Europe welding consumables (table 1) has been marked in the combined Schaeffler-

WRC 1992 Diagram (figure 1) and in the original WRC Diagram.

Table 1 Cr- and Ni-equivalent, calculated according Schaeffler and the WRC'92 Constitution Diagram

ident. Product WRC'92 Schaeffler ident. product WRC'92 Schaeffler

Cr-eq. Ni-eq. Cr-eq. Ni-eq. Cr-eq. Ni-eq. Cr-eq. Ni-eq.

A Jungo Zeron 100X 28.6 15.0 29.1 10.5 I Jungo 4500 25.0 27.3 26.4 26.2

B Jungo 4462 26.0 13.3 26.9 10.9 J Jungo 4465 27.2 25.7 28.1 25.2

C Arosta 304L 19.5 11.9 20.6 11.0 K NiCro 31/27 30.5 33.2 31.7 32.0

D Arosta 347 20.3 12.2 21.4 11.3 L Arosta 309S 23.6 14.2 24.6 13.3

E Arosta 316L 20.8 13.4 22.0 12.5 M Arosta 309Mo 25.4 14.5 26.7 13.5

F Arosta 318 21.5 13.8 22.7 12.8 N Arosta 307 17.8 13.3 18.7 14.2

G Arosta 4439 22.6 21.3 23.8 18.2 O Arosta 329 25.4 8.6 27.2 7.4

H Jungo 4455 23.0 19.9 23.5 20.3 P Limarosta 312 28.8 13.9 30.3 12.7

Fig. 2 WRC 1992 Constitution Diagram


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GENERALINFORMATIONS

Ferrite Number versus Ferrite Content

The Ferrite Number is not equal to the volumetric ferrite content (%). Although an absolute ferrite content can not be measured accu-

rately, a reasonable estimate of the ferrite content can be made by dividing the Ferrite Number by the factor f (% ferrite = FN / f) which

is dependant of the iron content in the weld metal as shown in figure 4.

Limitations

With the practice of measuring the Ferrite Number or ferrite content, welding conditions deviating from the standardized conditions

have always to be taken into account. Furthermore, comparison tests showed that the accuracy between measurements in various

laboratories may show differences up to +/- 10%.

Lincoln Electric laboratories

Since 1966 the Lincoln Electric and Lincoln Smitweld R&D departments have always been involved in the international development of

ferrite determinations. The laboratories are equipped with calibrated Magne Gages and on site measurement equipment. Primary

coating thickness standards and secondary standards are available for contract calibration work.

References

1) Schaeffler A.E., Metal Progress 56 (1949) p680-680s

2) DeLong W.T., Welding Journal 53 (1974) p273s-286s

3) Kotecki D.J., Siewert T.A., Welding Journal (1992) p171s-178s

4) Siewert T.A., McCowan C.N., Olson D.L., Welding Journal (1988) p289s-298s

5) Espy R.H., Welding Journal 61 (1982) p149s-156s

60 70 80 %Fe

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Fig. 4 Iron content versus factor fFig. 3 Magne Gage

Documents

Ferrit Tartalom a Korrozioallo Varratokban Schaeffler Diagram Es Wrc 1992 Diagram