Indian Journal of Science and Technology

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Nickel chromium molybdenum alloys are well known for its creep properties along with high corrosion resistance which finds a very large application in Oil and Petro chemical industries. However due to its prohibitive cost a cheaper alternative of cladding Ni alloys on carbon steel base material is widely used. The Ni alloy may be applied by different methods such as roll bonding, explosive cladding or by weld overlaying. As the weld overlay process is simple and requires a small set up, this is being widely used to improve the corrosion properties of various equipments used in Oil and Petro chemical industries. While the process is simple and easier to apply, enough care need to be applied in controlling the weld chemistry. The most critical element to control is the Fe content in the weld overlay. It is observed that the corrosion properties are not affected when the Fe content is restricted to below 5%. Effort is made in this study to apply the weld overlay using Gas metal arc welding process using soild Inconel 625 wire. Various properties such as chemical composition, cracking tendencies, hardness across the weld overlay area etc were also studied in this work.

Keywords

Bend Test, GMAW(Gas Metal Arc Welding), Hardness Survey, Inconel625, Macro Analysis
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