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Shielding gas recommendation

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  • Shielding gas recommendation

    Noob question on shielding gas here, I have been welding for several years with C25 gas on a MM211 with good results. I recently picked up a MM252 and want to give spray a try for those occasions when I work with 3/8 + plate. I never had a need to change from C25 with the 211 however, like anything when you have the ability to do something, the need seems to arise more and more often. Question is, I have read that 90/10 and 98/2 both work with spray, could one of the two be considered a general use gas over the other that would produce good results on 16 guage up to 3/8 material? I already have an oxy rig, pure argon for tig, and C25. Would like to not add another bottle to my already limited space.

  • #2
    Originally posted by Unibit View Post
    Noob question on shielding gas here, I have been welding for several years with C25 gas on a MM211 with good results. I recently picked up a MM252 and want to give spray a try for those occasions when I work with 3/8 + plate. I never had a need to change from C25 with the 211 however, like anything when you have the ability to do something, the need seems to arise more and more often. Question is, I have read that 90/10 and 98/2 both work with spray, could one of the two be considered a general use gas over the other that would produce good results on 16 guage up to 3/8 material? I already have an oxy rig, pure argon for tig, and C25. Would like to not add another bottle to my already limited space.
    replace your C25 with 90/10.... it works for both short circuit and spray transfer

    this manual explains a lot of the process and physics

    http://www.awssection.org/uploads/lo...Gas_Manual.pdf

    .

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    • #3
      Thanks for the link, good info. If I understand the content correctly, the higher argon content will help stabilize the spray weld puddle while CO2 maitains arc integrity. Sounds like I may have trouble with keeping the puddle fluid on low amperage welds. I guess I am getting another bottle if I want to spray.

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