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Welding 4130

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Jeff May

11-12-2001 10:44:13




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I have been told that to weld 4130 tubing it must be TIG welded.
I have a competition kart frame that needs some repair, I've spoke with several kart builders and
they all MIG their frames made out of 4130.
What wire should I use if I want to MIG my frame?
I have a Lincoln SP-175+ welder.
Anyone's thoughts?
Thanks in advance,
Jeff




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Rod MI

11-12-2001 22:35:01




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 Re: Welding 4130 in reply to Jeff May, 11-12-2001 10:44:13  
Jeff I also have a competition kart and I had to have it welded I had it welded with a tig welder you can mig weld it but you have to put the chassis in a oven Harrill Wiggins of phantom karts he mig welds them but I'm pretty shire he heats them in a oven first in any case the chassis isn’t the same after welding just didn’t handle right (ended up junking it) good luck Rod MI



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Tom-Pa

11-12-2001 15:25:44




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 Re: Welding 4130 in reply to Jeff May, 11-12-2001 10:44:13  
The only thing I use on 4130 is oxy-acetelene. If you want to know how it does, just look at how all the j-3 Cubs and other fabric aircraft are doing.. Mig and Tig welding is a fairly recent type of welding compared to when these aircraft were built...These new fangled types are a lot easier to use and will work quite well..When I took my Airframe mechanics practical exam, the examiner was considered an expert in oxy-acet. welding on aircraft...He welded J-3 cub frames for over 30 years in Lock Haven,Pa.. AND he liked my welding samples and used them to show what a weld should look like,,,his most common comment was "it will do in an emergency"
I practiced at home for about 6 months on 1/16th in thick tubing and plate doing 'T's, tube to tube at a 45 degree angle and welding on splice plates.. went thru several bottles (medium sized) before i went to the exam... It was well worth the effort...
Tom-Pa

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