Teknologi Dan Rekayasa METAL INERT GAS WELDING (MIG / GMAW)

MIG WELDING EQUIPMENT Objective : After studying this lesson, the students can be able to : explain the definition of MIG and MAG welding explain the application of MIG and MAG welding identify MIG welding equipments. Teknologi dan Rekayasa

MIG WELDING EQUIPMENT Understanding of MIG/MAG : Gas Metal Arc Welding (GMAW) is sometimes referred to as MIG or MAG MIG = Metal Inert Gas MAG = Metal Active Gas MIG shielded gas is : argon, helium, and a mixture of argon and helium. MAG shielded gas is : CO2, a mixture of argon, helium and CO2. Teknologi dan Rekayasa

MIG WELDING EQUIPMENT Application : MIG welding process is used for high alloy steels, aluminum, copper materials, as well as for nickel and nickel alloys. MAG welding process is mainly used for welding unalloyed and low alloyed steels. Teknologi dan Rekayasa

MIG WELDING EQUIPMENT Process : Fig. 1. MIG welding process Teknologi dan Rekayasa

MIG WELDING EQUIPMENT Equipment : MIG/MAG or GMAW equipment consist of four major units : Power supply Wire feeding mechanism Welding gun Gas supply Teknologi dan Rekayasa

MIG WELDING EQUIPMENT Fig. 2. Schematic lay out of manual and automatic MIG welder Teknologi dan Rekayasa

MIG WELDING EQUIPMENT 1. Power Supply The recommended machine for MIG welding is a rectifier or motor generator supplying direct current with normal limits of 200 to 350 amperes for all position welding. Teknologi dan Rekayasa

MIG WELDING EQUIPMENT DC MIG / MAG WELDING THYRISTOR DC MIG / MAG WELDING Teknologi dan Rekayasa

MIG WELDING EQUIPMENT 2. Wire feeding mechanism The wire feeding mechanism automatically drives the electrode wire from the wire spool to the gun and arc. Control on the panel be adjusted to vary the wire feeding speed. The wire feeder can be mounted on the power supply machine or can be separate from the welding machine. Teknologi dan Rekayasa

MIG WELDING EQUIPMENT Fig. 5. Wire feed system Teknologi dan Rekayasa

MIG WELDING EQUIPMENT Fig. 6. Feeder Roller 1. V Shaped for Fe & Ss 2. U Shaped for Al Fig. 6. Feeder Roller Teknologi dan Rekayasa

MIG WELDING EQUIPMENT 3. Welding gun For MIG and MAG welding the welding gun has the following functions : Deliver the wire electrode Conveying the welding current to the electrode through the contact tip. Conducting the protective gas to the welding gun Teknologi dan Rekayasa

MIG WELDING EQUIPMENT Fig. 4. Welding gun Teknologi dan Rekayasa

MIG WELDING EQUIPMENT 4. Gas supply The following shielding gases and gas mixtures are used : pure argon argon with 1%, 3% or 5% oxygen mixed gases on the basis of argon-carbon dioxide mixed gases on the basis of argon+CO2+O2 Teknologi dan Rekayasa

MIG WELDING EQUIPMENT The equipment for gas supply are : Cylinder gas Regulator manometer or flowmeter Gas supply hose Teknologi dan Rekayasa

MIG WELDING EQUIPMENT Fig. 5. Cylinder and shielding gas regulator Teknologi dan Rekayasa

The End THANK YOU Teknologi dan Rekayasa