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Dissimilar Spot Resistance Welding Between Commercially Pure Titanium and Austenitic Stainless Steel (With and Without Nickel Interlayer)

Hajighorbani, Ahmad Reza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41194 (07)
  4. Department: Materials Science and Engineering
  5. Advisor(s): Kokabi, Amir Hossein; Ekrami, Ali Akbar
  6. Abstract:
  7. In this project, dissimilar spot resistance welding between commercially pure titanium and austenitic stainless steel with 1.5 mm thickness was studied. Titanium has high resistance against corrosion, Therefore because of its thriving utilization in strategic industries; researchers became interested in usage of titanium with other metals that have more appropriate prices in different industries. Applying titanium on stainless steel pipes and storage tanks in petrochemical and nuclear industries is one of these fields. Hence various methods were examined for joining these two metals. The welding process of titanium and stainless steel has its complications as a result of brittle intermetalic compounds formation, thus using a Nickel interlayer for enhancing the strength of the joint was reported. Accordingly, with variation in time, voltage and thickness of the interlayer, raising the mechanical properties of the joint was pursued. After various examinations the optimum range for a high quality joint was established. In the terms of using the Nickel interlayer with 0.5 mm thickness, 10000 Newton pressure, 6 mm electrode diagonal, currency of 8.7 kA and 10 cycles for time, a joint with suitable mechanical properties was achieved. Effect of welding parameters on formation of intermetallic phases by microstructural examinations utilizing XRD and SEM were studied. By using tensile tests on defect-free samples, parameters which lead to maximum tensile strength were determined
  8. Keywords:
  9. Commercially Pure Titanium ; Austenitic Stainless Steel ; Interlayer ; Dissimilar Spot Resistance Welding

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