old sears welder

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HelloI just picked up a sears welder model 113 201440, it has  what they call infinite amp selection,I hooked it up to a 30 amp 220volt circuit and tried to run a bead with 6011 rod the weld seemed to blow all over,thried 6013 and it ran a good bead, tried 7018 and couldnt even get it to strike a good arc.Can any one give me a clue why it will weld 6013 1/8 inch but wont 6011 or 7018 1/8 inch.Thanks for any inputMorty911
Reply:If that welder is an AC machine then using a standard 7018 rod will be tough because most are designed to run on DC current.  Some of the larger industrial machines can pull the 7018's, but I have never seen one that satisfied me.  You can buy a 7018 AC  which is designed for the smaller "buzz boxes" etc... and they seem to work well for there intended purpose.  As far as the 6011 I am not sure,  the 6011 has a harsher arc than the 6013 and the bead appearance will not be near as nice as with the 6013, 7014, or the 7018.      Good luck  ~Jackson