Indian Welding Journal

Subrata Saha ¹, Naseem Ahmed ², Md. Abdur Rafiq ³, Tarapada Bhowmick ²

Affiliations
1 Kushtia Polytechnic Institute, Kushtia, BD
2 Department of Mechanical Engineering, Khulna University of Engineering and Technology, Khulna, BD
3 Department of Electrical and Electronic Engineering, Khulna University of Engineering and Technology, Khulna, BD

Abstract

Bead-on-plate experiments were conducted using a semi-automatic MIG welding machine to determine the effects of process parameters like wire diameter, wire feed rate, welding current, welding speed etc. on weld bead geometry like bead height, bead width, depth of penetration etc. An artificial neural network based modeling had successfully been done to correlate the effects of process parameters on weld bead geometry.

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Naseem Ahmed ¹, G. L. Datta ²

Affiliations
1 Mechanical Department, B.I.T., Khulna-9203, BD
2 Mechanical Engineering Department, I.I.T, Khargpur, IN

Abstract

Applications of external magnetic fields to welding processes are used to induce disturbances in the arc and weld pool. As a result arc deflection and changes in metal transfer characteristics are observed. Metallurgical properties of the weld metal are also affected. An investigation was undertaken to study the effect of external magnetic field on the metal transfer characteristics in CO₂ welding. The metallurgical characteristics of the weld metal were also studied. It has been observed that magnetic field imposition affected the droplet transfer rates and droplet transfer times. Dendrite arm spacing of the weld metal was found to decrease with magnetic field. Magnetic field also increased the carbon diffusion rate from the high carbon base metal to the low carbon metal.

Keywords

MAG Welding, External Magnetic Field, Droplet Transfer, Voltage Transients, Dendrite Arm Spacing, Carbon Diffusion.

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