I find your project very interesting and would like to try something like it myself someday. I agree with red yaris, increasing the width of your swing arm would make it much stronger. Something to look out for when wire feed welding is if you switch from a shielding gas and solid wire to flux core wire you may need to switch the polarity of your machine to get proper penetration and weld quality. I know from doing it wrong first and then reading the instructions that came with the wire after I was questioning my welding ability.
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