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Thread: mig welding

  1. #1
    Join Date
    Jul 2009
    Killarney Road, New Brunswick

    Default mig welding

    I have a question regarding spot welding , I been triing to make my welds look like tig welds. I been doing this by spot welding continues beeds. takes a little more time , but achieves a tig look. my question is , by welding this way doe's this make my welds weaker, over a continues beed?????
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  2. #2
    Join Date
    May 2006


    In a word, YES, they're weaker. When you stop and start the MIG weld, you also start and stop penetration and MIG is notorious for lack of penetration on starts anyway. However, the use of these welds does not appear to be any more demanding than stitch welding would handle. Doubtful they'll fail, but if they come apart at the corners, you'll see it quickly.
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  3. #3
    Join Date
    Dec 2007
    Los Angeles



    Ya have a whole bunch of Cold welds now.

    Only time to do that with Mig is on thin sheet metal to help control burn through and Distortion-

    looks like a front bumper in yer Pic? 3/16"- 1/4"?
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  4. #4
    Join Date
    Feb 2008


    Weaker again.

    Notice the little craters. They tend to seed cracks. And if the only reason is to make it look like a TIG weld, well, I hate to burst your bubble but it doesn't exactly look like a TIG weld either.

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  5. #5
    Join Date
    Jul 2009
    Killarney Road, New Brunswick


    weaker is what i was thinking. the metal is 3/16, the welder set at 1/4 and gas set at .2 thinking that the extra heat for penatration, sheilding gas staying on after, between welds. I purchase the miller 252 a little over a year , so I'm still learning alot. thanks for you help, I'll stick with the steady beads

  6. #6
    Join Date
    Aug 2009


    It's a weaker weld for sure if you cut it apart you may have voids where you start and stop..
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  7. #7
    Join Date
    Jul 2006


    I recently witnessed this same technique on a project built with 10 or 12-GA. Later the entire project was DP’ed, it looked like a scene from the movie texas chainsaw massacre!

  8. #8
    Join Date
    Nov 2007
    Southern Louisiana


    Little spot welds like those are typically much colder to deposit than a regular weld. That is why it is used on very thin materials. Also as mentioned and eluded to by others there are in fact cracks in each or the craters.

    To achieve a "stacked" look with wire feeding in a robotic application and does about the same hand held is to "weave on seam" or whip. Where your arc is traveling ahead of the puddle and then back into it. Much like running 6010 stick. As with any technique there are positives and negatives to whipping. There are other threads out here where we have discussed the differences in penetration, travel speed and ease of application for most techniques so I won't lengthen this out any more than needed. If you'd like further discussion on it just send me a private message and I would be happy to discuss it.

  9. #9
    Join Date
    Aug 2006
    Raymore Missouri


    Not to mention the welder cycling so often.
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