These are the different types of electrodes that are used on different types of metal. The 6011 and 6013 are known as fast freeze rodes which means they are used to close gaps up. in my opinion the 7014 rodes look better on the work piece and 6013 and 6011 and 7014 is a stronger rode.
Well check http://welderreview.com/thermadyne-w1003181-180-amp-multi-process-welding-system/
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