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Welding Metallurgy and Welding Feasibility of Low-Carbon Steel and Pure Copper in Resistance Spot Welding Process

Taghavi, Sahand | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54797 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Pouranvari, Majid
  7. Abstract:
  8. With the expansion of industry, steel to copper joints applications in heat and electricity transmission equipment have increased. Steel has better mechanical properties and weldability and lower prices, and copper has better thermal and electrical conductivity properties; because of that, this dissimilar joint fits needs such as cost reduction and high efficiency. This study has parametrically investigated the feasibility of dissimilar welding of these metals using the resistance spot welding process.This study conducts three phases. In the first phase, low carbon steel and copper were directly welded, and it was found that the mechanical properties of the joint were affected by physical and metallurgical parameters. In this case, severe indentations in the copper plate and solidification cracks in weld nuggets were the most critical factors in the loss of mechanical properties, respectively. In the second phase, a low carbon steel cover plate was used behind the copper sheet. In this case, severe indentations in the copper plate were decreased, but solidification cracks still existed. It is noteworthy that the solidification crack, due to the fact that it was created in the direction of thickness, caused a significant decrease in strength in the cross-tension test and in the first mode of failure. In the third phase, a nickel layer was used in the interface to eliminate solidification cracks. In this phase, by selecting the optimal thickness of nickel foil, the loss of strength in cross-tension was solved
  9. Keywords:
  10. Resistance Spot Welding ; Nickel Based Interlayer ; Dissimilar Spot Resistance Welding ; Cover Sheet Technique ; Steel-Copper Joint ; Dissimilar Electrodes

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