11 Fatigue Analysis of Dissimilar Metal Welded …
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Eurocode3 has been used for comparison of S-N curve obtained using experimental data related to welded joints by many researchers. Pijpers et al. [8] studied butt
welding of S690 and S1100 and compared experimental S-N data with Eurocode3
based curve. The experimental curve is above the code values in both cases. Costa
et al. [9] experimented with high strength steel and common steel and compared
the S-N curve with Eurocode3 to evaluate safety margin. Zong et al. [10] investigated fatigue performance of fillet weld joints of construction steel and compared
the performance using Eurocode3 and finite element analysis.
SS 316L grades have excellent toughness even at cryogenic temperatures. It also
has higher creep, stress to rupture and tensile strength at elevated temperatures. They
are weldable and possess reasonable corrosion resistance, and hence, they are being
used in high temperature and corrosive environment in combination with nickelbased alloys [11]. Monel 400 alloy has the excellent mechanical properties over
a wide temperature ranges including sub-zero temperatures as well as corrosion
resistance [12].
The present study is aimed at fatigue behaviour analysis of GTAW welded joints
of SS 316L/Monel 40 alloy using Eurocode3 and 95% survival probability with
supported findings from microhardness survey, optical microscopy and scanning
electron microscopy.
11.2 Materials and Methods
316L stainless steel and Monel 400 alloy were chosen as the materials for the current
study, and they were welded using gas tungsten arc welding process and a Ni–Cr
based filler material. The chemical composition of the materials used for the study
are listed in Table 11.1.
11.3 Welding
The welding plates used were having thickness of 3.2 mm and were welded using
TIG 275 Lincoln welding machine with argon as shielding gas. 30 V groove type butt
welding with a root gap of 2 mm has been used for the study (Fig. 11.1). Table 11.2
shows the weld groove details and process parameters.
11.4 Microhardness
The hardness values are measured with the help of Matsuzawa MMT-X digital microhardness tester as per ASTM E-384. The Vickers microhardness for the heat-affecting
zone (HAZ), base metal (BM) and weld zone (WZ), for dissimilar weldments was
371
Eurocode3 has been used for comparison of S-N curve obtained using experimental data related to welded joints by many researchers. Pijpers et al. [8] studied butt
welding of S690 and S1100 and compared experimental S-N data with Eurocode3
based curve. The experimental curve is above the code values in both cases. Costa
et al. [9] experimented with high strength steel and common steel and compared
the S-N curve with Eurocode3 to evaluate safety margin. Zong et al. [10] investigated fatigue performance of fillet weld joints of construction steel and compared
the performance using Eurocode3 and finite element analysis.
SS 316L grades have excellent toughness even at cryogenic temperatures. It also
has higher creep, stress to rupture and tensile strength at elevated temperatures. They
are weldable and possess reasonable corrosion resistance, and hence, they are being
used in high temperature and corrosive environment in combination with nickelbased alloys [11]. Monel 400 alloy has the excellent mechanical properties over
a wide temperature ranges including sub-zero temperatures as well as corrosion
resistance [12].
The present study is aimed at fatigue behaviour analysis of GTAW welded joints
of SS 316L/Monel 40 alloy using Eurocode3 and 95% survival probability with
supported findings from microhardness survey, optical microscopy and scanning
electron microscopy.
11.2 Materials and Methods
316L stainless steel and Monel 400 alloy were chosen as the materials for the current
study, and they were welded using gas tungsten arc welding process and a Ni–Cr
based filler material. The chemical composition of the materials used for the study
are listed in Table 11.1.
11.3 Welding
The welding plates used were having thickness of 3.2 mm and were welded using
TIG 275 Lincoln welding machine with argon as shielding gas. 30 V groove type butt
welding with a root gap of 2 mm has been used for the study (Fig. 11.1). Table 11.2
shows the weld groove details and process parameters.
11.4 Microhardness
The hardness values are measured with the help of Matsuzawa MMT-X digital microhardness tester as per ASTM E-384. The Vickers microhardness for the heat-affecting
zone (HAZ), base metal (BM) and weld zone (WZ), for dissimilar weldments was