Chemical Characterization And Antioxidant Activity Of Polysaccharide Extract From Spent Pleurotus Ostrials Subtrate

The best common gas-shielded arc-welding methods utilised in numerous manufacturing applications are metal inert gas (MIG) and tungsten inert gas (TIG). When contrast to TIG welding, MIG welding is a more efficient procedure. However, further work is desired to decrease sprickle and increase weld metal durability. Even though pure Ar shielding gas is preferred for weld metal wilpower, MIG arcs are so unsteady in pure Ar that welding is challenging. We discovered that by utilising a hybrid TIG/MIG system, MIG arcs can become steady even while employing pure argon. When the high temperature were applied at parent material, it will produce two different zones which is heat affected zone (HAZ) and weld metal. Heat affected zone consists of coarse grained heat affected zone (CGHAZ), fined grain heat affected zone (FGHAZ), intercritical grain heat affected zone (ICGHAZ) and subcritical grain heat affected zone (SCGHAZ). Coarse grain heat affected zone (CGHAZ) is the most affected area since it is located very close to the fusion area. In this study, the TIG/MIG hybrid welding are compared with conventional MIG welding for the purpose to reduce the heat input and produce a fine grain at HAZ by using two different torch angle. By using TIG/MIG hybrid welding, the grain size at HAZ can be reduce from 59.73 pm to 57.10 pm for 60° torch angle and from 46.10 pm to 43.89 pm for 90° torch angle and the refinement of the grain size is higher than using conventional MIG welding. Also, the formation of martensite microstructure at HAZ is reduce by using TIG/MIG hybrid welding compare to conventional MIG welding. The experimental result clearly shows that the toughness at HAZ for conventional MIG welding is higher than TIG/MIG hybrid welding thus increasing the brittleness at HAZ. In consequence, the toughness and ductility at HAZ for TIG/MIG hybrid welding was improved. Overall, it can be said that different types of welding affect the microstructure formation and mechanical properties of the weldment.