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  1. #1

    Default mig welding aluminium without spool gun

    Okay so I'm fairly new to mig welding aluminium.. Actually welding aluminium period.. And I am having a couple issues.. I got a HH140. And I don't have a spool gun.. The wire is feeding fine through the lead.. My main problem is. While the bead itself looks okay from the top. Its got bad undercut on the sides.. I've tried lowering voltage. Raising voltage. Adjusting wire speed. Giving more stickout. And I can't get it to do right.. Anyone know what might be the problem?

  2. #2
    Join Date
    Sep 2005
    Salem ,Ohio


    What size wire? .030 works the best in the smaller machines. You are using Argon right? Post some pics...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.

  3. #3


    Yes. .030 wire.. And I am guessing its 100% argon. That's what I told the guy at the place I get my gas from... I'll try to post pics tomorrow.. Its already dark here.. And my camera sucks

  4. #4
    Join Date
    Jan 2007
    Montana, USA


    Have you played with varying travel speed?

  5. #5
    Join Date
    Jul 2009


    Undercut is also caused by torch angle, try tilting the torch to push filler into the joint at the correct angle.

    Grip it and Rip it

  6. #6
    Join Date
    Mar 2009


    does the wire allow make much of a difference? I am new to MIg and in my reading it seems the 5000 series wire is stringer than the 4000 series... is it possible the stiffness is an issue as it puts pressure on the weld pool? just a thought, might be way off.. I slowed my wire way down and cranked the power down, so I could paint my puddle, almost like I would tig... I could actually see the cherry in the aluminum and I moved on .... I know if set up right, you just buzz right through...

    I mention that because it would seem the 4000 series wire wouldn't push through your mig gun as easily as the stiffer allow

    good luck


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