Tig Welding Tool steel
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  1. #1
    Join Date
    Apr 2010
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    15

    Tig Welding Tool steel

    What is the best rod for tig welding two pieces of 3/8 tool steel together ( butt joint) ?

  2. #2
    Join Date
    Nov 2005
    Location
    Santa Fe, NM
    Posts
    1,706

    Re: Tig Welding Tool steel

    To start with it would be best to know what the tool steel alloy is. Do the weld properties need to closely match those of the base material, or would a ductile weld perhaps be better for the application? Is the tool steel already heat treated (hardened) or will it be welded in the annealed conditon?

  3. #3
    Join Date
    May 2010
    Location
    ct.
    Posts
    454

    Re: Tig Welding Tool steel

    I worked at a shop that made injection molds and stamping dies ,s7 and d2 tool steels etc, all heat treated.There was a weldor who would repair them (build up worn areas for machining etc.)He had filler rod that matched each type of tool steel(s7,d2,o1,a?) Had to be retempered after welding.Welding was kind of a last ditch effort to save the tool, or a temporary fix while new tool could be built.
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  4. #4
    Join Date
    Apr 2010
    Posts
    15

    Re: Tig Welding Tool steel

    Quote Originally Posted by pulser View Post
    To start with it would be best to know what the tool steel alloy is. Do the weld properties need to closely match those of the base material, or would a ductile weld perhaps be better for the application? Is the tool steel already heat treated (hardened) or will it be welded in the annealed conditon?
    01 tool steel / not heat treated

  5. #5
    Join Date
    Apr 2010
    Location
    Galesburg, il USA
    Posts
    1,663

    Re: Tig Welding Tool steel

    Google "weld mold 935", for tig 935-T = AISI O1.

    Praxair used to keep some weld mold tig rod at distribution centers. You would do well if you called the maker to discuss your particular purpose for complete instructions.

    Stoody also has AISI O1, but I can't remember if they have cut rod.

    Matt

  6. #6
    Join Date
    Oct 2007
    Location
    Yuba City, CA
    Posts
    1,568

    Re: Tig Welding Tool steel

    Quote Originally Posted by Uncle Hemi View Post
    01 tool steel / not heat treated
    Be aware that regardless of the filler used, the weld and heat
    affected zone (HAZ) of the parent material will show significant
    increase in hardness after welding, even with air cool-no quench.
    ....been there & dun that.
    Blackbird

    Fat Bastard for President-2016

  7. #7
    Join Date
    Jul 2015
    Location
    Dallas
    Posts
    2

    Re: Tig Welding Tool steel

    Depending on the pressure/forces being applied on piece, ER309L or ER308L S.S.(more common at weld supply) Rod has worked great for me over the years, The Stainless rod has good flexibility with no cracking after welding, I usually don't pre-heat/anneal, or quench, just let air cool. But if it's super important, and you need/want to do it properly, you'd have to find the make up of the tool steel, and order or get if possible the closest matching Rod for higher chromium metals, find the percentage of chromium, vanadium, molybdenum, or tungsten. Esab filler metals, give a chart on high chromium(tool steels) rods, with the percentages of each element the rod is made for. But Stainless rod has worked great for me, such as custom sockets, dies, punches, chisels, hammer heads, etc.. never had anything break, I still whack away with multiple hammers ive put a metal handle on. Guy I work with(new to TIG) used normal carbon steel ER70S rod on repairing an air chisel tool, not 30 mins later it was brought back, snapped right where the weld was. He also water quenched it. Well good luck, hope this helps.
    HANDS LIKE A SURGEON, MOUTH LIKE A SAILOR, THE AZZ OF A SKUNK. YEP, YOUR A WELDER!!

  8. #8
    Join Date
    Dec 2010
    Location
    SoCal-LA
    Posts
    6,241

    Re: Tig Welding Tool steel

    SuperMissileWeld, or the generic thereof ER312.
    Weld like a "WELDOR", not a wel-"DERR"
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  9. #9
    Join Date
    Mar 2015
    Posts
    89

    Re: Tig Welding Tool steel

    You said its not heat treated. Thats good.

    Do you plan to heat treat the part, and if so, do you need O1 properties in the weld zone? In this case you need to use O1 filler material.

    If the part is left soft or if you don't care about heat treatment in the weld zone use the above recommended SS or SuperMissile.

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