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bobcat 225 and tig alum

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  • bobcat 225 and tig alum

    need to tig an aluminum oxygen cylinder base back on to cylinder what setting to use with weldcraft tig torch and argon gas.i know i have to scratch start on a piece of copper, it is 3/16 thick aluminum. machine is bobcat 225NT

  • #2
    you need a high-frequency arc starter and stabilizer
    like the miller HD-251 to weld aluminum with the bobcat
    they run around $1000.00

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    • #3
      Why copper?

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      • #4
        I hope you're only making something decorative. There's NO welding allowed on any high pressure cylinder. Not even during manufacturing.

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        • #5
          conversion to cold smoker

          Originally posted by Craig in Denver View Post
          I hope you're only making something decorative. There's NO welding allowed on any high pressure cylinder. Not even during manufacturing.
          it is to be part of a cold smoker no pressure

          Comment


          • #6
            why copper

            Originally posted by fabricator View Post
            Why copper?
            it supposedly dont eat the tungsten

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            • #7
              Thats a new one for me.I think you were misinformed.However you will need high frequency a/c in order to tig aluminum.

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              • #8
                alum welding

                You can use Heilum to weld alum But it's not as clean.Rent a bottle for a month will it be cheaper.

                Comment


                • #9
                  You can DC tig aluminum......why wouldn't it work with the Bobcat?
                  Originally posted by fabricator View Post
                  Thats a new one for me.I think you were misinformed.However you will need high frequency a/c in order to tig aluminum.

                  Comment


                  • #10
                    Originally posted by retiredIW View Post
                    it supposedly dont eat the tungsten
                    I do not doubt one bit that there is a place for the copper thing...I have heard it as well but it is not used for aluminum. Trust me I did about 10 years on a 225NT Bobcat with an old Linde Freekbox and a #26V torch with a valve and pure argon. That is the minimum you will get by with unless you can score lab grade helium for using DC EN.
                    You should just find someone with a spoolgun or hire a pro to tig it for just welding one item.
                    Bring your stuff and come on down to my shop and I'll do 'er for free
                    I like to shoot the bull with old welders

                    Comment


                    • #11
                      The copper sheet was used for starting an arc in DC Tig welding. Does not contaminate the tungsten as even steel will. Generally used on machines without a lift-arc feature.

                      As has been mentioned, Hi Freq is required for AC Tig welding. Without it (except for the inverters) the arc will extinguish as it passes thru 0 when switching from DC+ to DC-.

                      Comment


                      • #12
                        ALum

                        I welded it with a XMT 304 at work with Helium.We didn't have a hight Feak.Which I do at my shop.I got a Syncrowave 250 DX with a watercooled rig.Miller 252,Miller 140 and 2 other machines/ 675 plasma.Fixing to get Trailblazer 302.My coworker is the one who shown me You could use helium.I tried it I really didn't like the way it welded it wasn't as clean like my new Syncrowave 250 DX LOL

                        Comment


                        • #13
                          I hope after 7 months he figgured it out.

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