Alga, I dont thinkk theres any easy way to explain it but. A MIG power source has a Flat characteristic, i.e small change in voltage = large change in amps, this maintains arc length. pull torch away from workpiece arc gets longer resitance increases amperage goes down burn off rate reduces wire gets closer to workpiece correct arc length is maintained. Increase the wire diameter to 1mm and maintain wire feed your pushing more wire into weld pool therefore more amperage required to burn off wire therefore more heat into workpiece and more penetration. Having said that the voltage will obviously need to be increased. Now if your welding set you have purchased has the capacity you will certainly be able to liberate more power and a higher current density from larger wire diameters.
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