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  1. #1
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    Default Weld strength with flux wire vs gas....

    Is there a difference in weld strength between the two with all other things being equal....?
    thanks for responses...


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  2. #2
    Elite Member Shield Arc's Avatar
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    Default Re: Weld strength with flux wire vs gas....

    There are so many wires on the market today, that run on different processes.
    You have to read the manufactures specifications. Strength is one thing, deposit rate is another.
    I've always thought dual shield, (flux core gas coverage) was very fast for all position work. For most of us here dealing with just mild steel, just about any wire or process will have plenty of strength.
    I think where most people get into trouble with wire feeders, is they do not run them hot enough! It is so easy with a Mig welder to get a beautiful looking weld, and yet have no penetration! Mig welders are notorious for cold lap, I'd much rather see a little under cut on the toes of a Mig weld than cold lap! At least then I know the weld has bitten into the base metal.


    Miller Dynasty 300.
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    Lincoln LF-72 wire feeder.
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    Lincoln LN-25.
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    Everlast PowerArc 200.
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  3. #3
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    Default

    Quote Originally Posted by Shield Arc View Post
    There are so many wires on the market today, that run on different processes.
    You have to read the manufactures specifications. Strength is one thing, deposit rate is another.
    I've always thought dual shield, (flux core gas coverage) was very fast for all position work. For most of us here dealing with just mild steel, just about any wire or process will have plenty of strength.
    I think where most people get into trouble with wire feeders, is they do not run them hot enough! It is so easy with a Mig welder to get a beautiful looking weld, and yet have no penetration! Mig welders are notorious for cold lap, I'd much rather see a little under cut on the toes of a Mig weld than cold lap! At least then I know the weld has bitten into the base metal.
    Very well put, I see it all the time.

  4. #4
    Veteran Member CHDinCT's Avatar
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    Default Re: Weld strength with flux wire vs gas....

    Quote Originally Posted by Shield Arc View Post
    Mig welders are notorious for cold lap, I'd much rather see a little under cut on the toes of a Mig weld than cold lap! At least then I know the weld has bitten into the base metal.
    What is cold lap and how would I identify it? Any pic's? When you say this is common with Mig welders, do you mean when using gas (vs flux core) or more generally as applying to flux core too? Just learning to use my Mig/flux core and planning on a major project come spring. Thanks.
    Chris

    2 acres and a mule, er, Kubota BX25, and too many other toys,er, tools to list.

  5. #5
    Super Member radioman's Avatar
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    Default Re: Weld strength with flux wire vs gas....

    I am not an expert or anything - still learning myself and I might be corrected by other experts. basically put- you really want to have a good penetration. If the flux metal you are feeding is not reaching through the metal you are welding - then its not hot enough or its too thick for what you are doing.
    A cold lap is basically a bead on top of two metals and it not melting both sides of the metals you are joining. You can almost whack it off with a hammer and chisel. Sometimes you cant whack it off - but its only holding a little of the metal pieces you are joining so it breaks off under stress.
    Did you try practicing welding yet with scrap? If so then cut across the welded pieces in several places and look at how its melted together. Be sure you cut across funny looking welds and good welded piece to understand your technique that needs to be modified.

  6. #6
    Elite Member Shield Arc's Avatar
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    Default Re: Weld strength with flux wire vs gas....

    Replace "overlap" in this picture with cold lap.
    Attached Thumbnails Attached Thumbnails -cold-lap-jpg  


    Miller Dynasty 300.
    Lincoln V350-Pro w/pulse.
    Lincoln LF-72 wire feeder.
    Lincoln SG Spool gun.

    Lincoln LN-25.
    1937 IdealArc-300.
    Everlast PowerArc 200.
    Everlast PowerArc 300.
    5 Lincoln SA-200s.
    1800 Ellis saw.
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  7. #7
    Super Member Gary Fowler's Avatar
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    Default Re: Weld strength with flux wire vs gas....

    Another type of cold lap can be found between passes and is a common MIG /FCAW occurrence where the two passes don't fuse together and just basically lay on top of each other with very little fusion between the layers. This may occur and not show side cold lap and is hard to see even with xray unless you can expose it from the sides which is not common practice or even possible in many cases. For this reason, many welding engineers dislike the use of it in pressure containing welds unless it is in "spray mode" which runs with very high current.
    Always run your wire feeders as "hot" as possible.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  8. #8
    Elite Member Shield Arc's Avatar
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    Default Re: Weld strength with flux wire vs gas....

    Now here is a hot Mig weld! .035" Lincoln L-56 wire.
    Attached Thumbnails Attached Thumbnails -29-0-jpg  


    Miller Dynasty 300.
    Lincoln V350-Pro w/pulse.
    Lincoln LF-72 wire feeder.
    Lincoln SG Spool gun.

    Lincoln LN-25.
    1937 IdealArc-300.
    Everlast PowerArc 200.
    Everlast PowerArc 300.
    5 Lincoln SA-200s.
    1800 Ellis saw.
    Hypertherm Powermax 1250, CNC table.
    PROFAX Welding Positioner.
    JD2 model 3.

  9. #9
    Super Member Gary Fowler's Avatar
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    Default Re: Weld strength with flux wire vs gas....

    Quote Originally Posted by Shield Arc View Post
    Now here is a hot Mig weld! .035" Lincoln L-56 wire.
    Now that is the way a wire weld is supposed to look
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  10. #10
    Super Member radioman's Avatar
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    Default Re: Weld strength with flux wire vs gas....

    nice weld -- I cant do that ... yet . I hope to do that good before I die.

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