Abstract
In the present study, MIG welding is carried out on low carbon steel type (AISI 1015) by using electrode ER308L of 1.5mm diameter with direct current straight polarity (DCSP). The joint geometry is of a single V-butt joint with one pass welding stroke for different plate thicknesses of 6, 8, and 10 mm. In welding experiments, AISI 1015 plates with dimensions of 200×100mm and edge angle of 60o from both sides are utilized. In this work, three main parameters related to MIG welding process are investigated, which are welding current, welding speed, heat input and plate thickness, and to achieve that three groups of plates are employed each one consists of three plates. The results indicate that increasing the weld heat input (through changing the current and voltage) leads to an increase in widmanstatten ferrite (WF), acicular ferrite (AF) and polygonal ferrite (PF) in FZ region, and a reduction in grain size. It is observed that the micro-hardness of welded AISI 1015 plate increases as the weld heat input decreases. As well as increasing the weld heat input results in an increase in the width of WM and HAZ and a reduction in the impact energy of the weld joint of AISI 1015 at WM region. Also, it is noted the corrosion rate of weld joint increases with increase of Icorr due to increasing in welding current (heat input), corrosion rate increased up to (0.126µm/yr.) with increasing of heat input up to (1.27 KJ/mm).
Highlights
Numerous welding systems are utilized to create fabricated assemblies that may not seem to incorporate welding by any means
metal inert gas (MIG) welding process overcome the constraint of using small lengths of electrodes as in manual metal arc welding and overcomes the incapability of the submerged arc process to weld in a number of positions
When increase the welding speed leads to a slight decrease in grain size in FZ and heat affected zone (HAZ), but the grain size of base metal (BM) has not affected
Summary
Numerous welding systems are utilized to create fabricated assemblies that may not seem to incorporate welding by any means. It is found that the process key parameters of metal inert gas (MIG) have a crucial influence on the quality, productivity and cost of welding joints [4,5,6]. MIG welding process overcome the constraint of using small lengths of electrodes as in manual metal arc welding and overcomes the incapability of the submerged arc process to weld in a number of positions. It is not surprising, that the 50/50 level of the relative weights of weld metal deposited by manual metal arc and MIG processes was reached in 1973 in the USA and in 1978 in Europe [7]
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