International Journal of Materials Engineering and Technology
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Abstract: Metal active gas (MAG)
process is an important component in many industrial operations. Due to its
higher welding speed, automation and weld bead protection against the atmosphere
gases (especially this process is widely used in
different industries. In this research, the effects of various parameters of
process, including arc voltage, welding current and welding speed, on mechanical
properties and penetration of weld in CK45 steel welded by robotic MAG welding
were investigated. Welding currents, arc voltages and welding speeds were chosen
as 100, 110, 120A, 23, 25 and 27V,
42, 62 and 82cm/min respectively, for
all experiments. Mechanical tests and geometry analysis were performed after the
welding operation. Results were clearly illustrated that except impact energy,
all of the mechanical properties showed a monotonic relationship to welding
parameters. The yield, tensile strength (UTS) and hardness of weld metal
increased with increasing welding speed whereas the elongation (%) of weld
increased with increasing welding current and arc voltage. It was also found
that increasing of welding current or arc voltage increased the depth of weld
penetration. The deepest penetration in this research was observed in 62cm/min
welding speed.
Keywords and phrases: welding parameters, heat input, cooling rate.
