Numerical and experimental analyses for effect of welding currents on cooling rates in (m maw)‎ process

Abstract EN

In this study, Manual Metal Arc Welding (MMAW) is carried out for low carbon steel (AISI 1015) with using electrode (E7018).

Direct current straight polarity (DCSP) with the joint geometry of single -V- butt joint and weld one pass are used for plate of thickness 8mm.

experimentally, obtained temperature distribution in fusion zone which is measured by insert the thermocouple in weld metal.

Cooling rates are determined for the fusion zone at different welding currents (100, 120 and 140) Amp with constant welding speed at 3.2mm/s.

Numerical analysis by using the Control Volume Method (CVM), applied to three dimensional heat transfer model to determine the cooling rate in fusion zone.

Cooling rates models are helping in prediction the microstructure (phases, grain size and volume fraction) and micro hardness distribution in weld metal and heat affected zone.

The comparison of cooling curves between numerical and experimental work have a good agreement, so that deviation was in range ( 6% -21%) which is confirming the capability and reliability of the proposed numerical heat transfer model in manual metal arc welding.

The best result for cooling rates when applying mathematical model is at welding current 140Amp.