• Loveleen Kumar Bhagi
• Avinash Singh
• Anand Gupta
• Rahul Kumar Upadhyay

The objective of this study is to illustrate the effect of heat treatment on microstructure and mechanical properties of oxyacetylene gas welded copper and low carbon steel. The case in consideration is welding of copper to carbon steel of same diameters to be used in the aeronautic industry and in EDM tool. Carbon steel welded to copper can be used as the tool in EDM with copper end in contact with the dielectric medium. This will greatly reduce the cost of the material used in manufacturing EDM tool. To perform experiments, the desired dimension of the specimen using turning and facing process are reduced from 25 mm × 30 mm size bar of copper and carbon steel to the desired (or required) 21 mm diameter and 27 mm length. 14 samples were prepared by using oxyacetylene welding. Mechanical testing of samples was carried out to determine the hardness and ultimate tensile strength. All the experimental work, mechanical testing and microstructural analysis were conducted at Lovely Professional University, Phagwara, Punjab. Quenching were conducted to study the effect of cooling rate on material. Specimens were heated at 730°C and 850°C and were cooled by using three types of cooling medium; water quench, oil quench and sand quench. Hardness and Tensile strength of low carbon steel and copper are 55 HRC, 35 BHN, 370 MPa and 290 MPa was obtained for the as received specimen. It has been observed that cooling rate contributed to a higher strength due to local strain effect. Rapid cooling in quenched specimen had successfully increase the hardness by 57% for copper and for low carbon steel recorded the highest tensile strength of 548 MPa while slow cooling rate which experienced by an annealed specimen resulted in the lowest tensile strength of 251 MPa. Microstructure investigation shows annealed specimen produced coarse austenitic structure with larger grain size. Meanwhile, quenched specimen produced finer austenitic structure with smaller grain size.

Copper, Mild Steel, Dissimilar Welding, Induction Heating, Hardness and Tensile Strength

"Analysis of Response Parameter of Dissimilar Metals Harden by Induction Process", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 12, page no.865-873, December 2018, Available :http://www.jetir.org/papers/JETIREB06103.pdf

"Analysis of Response Parameter of Dissimilar Metals Harden by Induction Process", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 12, page no. pp865-873, December 2018, Available at : http://www.jetir.org/papers/JETIREB06103.pdf