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SELECTION OF ELECTRODES ON MIG (METAL INERT GAS) WELDING PROCESSStudent informationUnit informationSubmission week and date
IntroductionGlobally welders face the challenge of selecting the electrode type and weld size to use inwelding (Shih, et al., 2011). This project focusses on the process and considerations in choosingthe weld size and electrode type. The welder must consider matching the type of wire to the typeof metal being welded, the position to be welded, the resistance of the metal being welded to heatand the type of transfer (Hussain, et al., 2010). All these considerations resulting from effectingthis project are mandatory in selecting the ideal welding electrode.Metal inert gas (Gas metal arc welding) is an arc welding procedure which involves an electricarc between a metal and a consumable electrode generating the heat that is utilized in metalmelting (Zhang, et al., 2011). Most of the time in welding engineers specify the electrode typeand weld size but, in the case, where they do not specify there is need to identify the two (Tusek,et al., 2010). The criteria used to select the wire type is that it should match the base metalstrength with the weld metal strength (Pal, et al., 2009).The Metal inert gas electrodes are popularly referred to as Gas Metal Arc welding electrodes.This project involves the selection of electrodes on Metal inert gas welding process (Masubuchi,et al., 2013). The principle used is that when choosing the electrode (MIG wire) consideration isput on the type of metal being welded in that the wire chosen must match to the metal beingwelded (Fan, et al., 2014). Other considerations in play in this project are position to be welded,resistance to heat and the type of transfer (Kumar, et al., 2009).Tseng in his research on metal inert gas welding electrode selection indicates that the electrodeserving as the filler metal at the weld must be compatible with the metal being welded. He pointsout that some metals alloys such as aluminum and steel are not compatible because of the largedifference between their melting point (Tseng, et al., 2011). However, most researchers on thistopic do not point out clearly the criteria which should be applied in electrode selection.Tarng in his journal states that the selection of electrodes is based mainly on the composition ofthe metal to be welded, the material surface conditions and the process to be used. He furtherindicates that welders must be careful when selecting the type of electrode to use in weldingsince it will determine the weld quality (Tarng, et al., 2009).This project deals with the selection of electrodes in metal inert gas welding. The consequence ofthis project is to ensure that welders select the ideal electrode to be used in welding whileconsidering factors such as the melting point o the electrode versus the melting point of the metalto be welded (Chern, et al., 2011).This project is meant to make the process of electrode selection cost effective and easy. It willguide welders on how to select the electrode based on the tensile strength, the selected metalmust meet the minimum tensile strength of 70,000 psi for majority of the metals (Tanaka, 2012,2043-2052). The main consideration will be that the electrode must be compatible with the metalto be welded (Pickin, et al., 2016).
The project will also be seeking to find out why metals such as titanium, silicon, manganese andaluminum are required in all commercially available electrodes. Numerous experiments will beconducted to determine all these (Durgitlu, et al., 2014).