"heat input" and parameters!
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  1. #1
    Join Date
    Oct 2010
    Location
    south of Sweden, Works in Norway.
    Posts
    8

    "heat input" and parameters!

    Hi all!
    My first question will be regarding the basic of maintain a good gas arc weld.

    For the first is there a table or a calculation formula to remain the optimal heat input for differnt materials, Steel, Stainles, Aluminium?

    I do know how to calculate the heat input if I have the parameter and travelspeed.

    Or there is a table for parameters regarding this materials or a calculation formula?

    As this far I have done this from experience or by the wire recomendation. Sometimes there is no guideline values for the parameters recomended by the wirespecification.

    Thanks
    //Janne
    All will melt for a welder!

  2. #2
    Join Date
    Mar 2008
    Location
    Greater Seattle, WA
    Posts
    593

    Re: "heat input" and parameters!

    Assuming you're talking about TIG welding, the Miller TIG welding calculator is an OK (although pretty basic) starting point:
    http://www.millerwelds.com/resources...calculator.php

  3. #3
    Join Date
    Oct 2010
    Location
    south of Sweden, Works in Norway.
    Posts
    8

    Re: "heat input" and parameters!

    Thanks jakeru!
    Yes I have seen this and late yesterday I did find basic parameters at Oxfords homepage.
    So now I do have pdf tables about the parameters.

    Anyone want some just pm me and give me an email to send them to.
    Today I will follow a welder in our company to catch the travelspeeds he uses. This guy is from Poland and a real damn good welder. I think that you who are the best welders does have it in your blood.
    //Janne
    All will melt for a welder!

  4. #4
    Join Date
    Dec 2011
    Location
    Indonesia
    Posts
    1

    Re: "heat input" and parameters!

    Hi Nukisen I would like to have acopy from your pdf if it is not too much to ask

    thanks

    emailed you already

  5. #5
    Join Date
    Jan 2012
    Location
    Huntsville, Texas
    Posts
    1

    Re: "heat input" and parameters!

    I have a question regarding the heat calculation. In my shop we are working on a new project, I operate a saw machine both long seam and roll out. The WPS gives parameters for saw with 3/32 and 5/32 wire. The volts, amps and travel speed are the same for both wire sizes. The calculation that they use does not take the wire size into consideration. The process works fine for the 3/32 wire but when using 5/32 wire, the weld looks like...bad. The wire that we use is LAC-M2 and 888 flux. I believe that the amp limits should be considerably higher for the 5/32 wire. This is true of other projects that we are doing and have completed, the amps are higher for the 5/32 size wire and working with the same type of material. My basic question is; is there a joules calculation that considers the wire size for sub-arc welding?

  6. #6
    Join Date
    Jul 2009
    Location
    North Carolina
    Posts
    48

    Re: "heat input" and parameters!

    The wire size is taken into account indirectly with the heat imput formula, larger wire = more amps / volts that are plugged into your formula. Depending on the code and other requirements a new pqr might need to be ran to change your parameters to meet the requirments of the larger wire.
    AWS Certified Welding Inspector
    Ultrasonic Tech LVL 2
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  7. #7
    Join Date
    Nov 2011
    Location
    Oklahoma
    Posts
    155

    Re: "heat input" and parameters!

    Quote Originally Posted by Josh Flynn View Post
    The wire size is taken into account indirectly with the heat imput formula, larger wire = more amps / volts that are plugged into your formula. Depending on the code and other requirements a new pqr might need to be ran to change your parameters to meet the requirments of the larger wire.
    Wire diameter change should be a seperate welding procedure, if welding under code. I would assume AWS D1.1 and ASME would read the same on this. Going from 3/32 to 5/32 is a huge change in heat input.......no way the same amps and wire/travel speed would be the same.
    A young green pipe welder asked an old salt one day...How can I make the weld on the bottom of the pipe look like the top.......The old salt replied....Screw up the top......

  8. #8
    Join Date
    Jul 2009
    Location
    North Carolina
    Posts
    48

    Re: "heat input" and parameters!

    Quote Originally Posted by Awelderiam View Post
    Wire diameter change should be a seperate welding procedure, if welding under code. I would assume AWS D1.1 and ASME would read the same on this. Going from 3/32 to 5/32 is a huge change in heat input.......no way the same amps and wire/travel speed would be the same.
    No you would not use the same amps/wire speed/ travle speed for differnet wire types( my previous post), you take the wire diameter size into accout with the heat input formula. If you were working to D1.1 you would need to run a new pqr for the differnet wire sizes, unless its GTAW and you can change the size filler wire by +-1/16 with no need to requal.
    AWS Certified Welding Inspector
    Ultrasonic Tech LVL 2
    Magnetic Partical Tech LVL 2
    Certified Welder Plate 3G & 4G unlimited

    Shieldarc 250
    Chop saw
    Drills / grinders
    band saw
    oxy/acetylene
    hand tools

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