Malleability of welds

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Q:I did read, MAG welds (on thin steel, carbody panels) have the downside not being malleable (needed when reshaping the panel after the weld has been done) due to the hardness of the welding wire used (the wire on the spool).Another reading more recently: in TIG welding (steel), you can use MAG welding wire as a filler rod.How does this comply with the statement, TIG welds are malleable?Is this aspect of TIG welds lost as soon as MAG wire has been used as a filler rod in creating them?Thanks
Reply:It is my understanding that using MIG (MAG) welding to stitch panels together has to do with the speed that the weld bead cools is what creates the loss of malleablity not the actual filler wire. I have used .023 wire  to tig with many times and found no difference in workablity than using "TIG" rod.mooseTimmetalcraft by mooseSoutheast Michiganhttps://www.facebook.com/Metalcraftbymoose

  Stupid Hurts!!
Reply:There are also high silica Easy-Grind wires available (for a price) that help prevent the hardness of a MIG weld.The harder you fall, the higher you bounce...250 amp Miller DialArc AC/DC StickF-225 amp Forney AC Stick230 amp Sears AC StickLincoln 180C MIGVictor Medalist 350 O/ACut 50 PlasmaLes
Reply:As Moose said,rapid cooling harden's steel as well as weld bead.  Metal can be softened by heating then slowly cooling.  If you often have a need,talk to blacksmiths about learning.  Knife making has become popular and blades must be precisly heat treated. I'm no expert by a long ways but have tinkered with it several times with satisfactory results. A body panel would require some inginuty but here's how a small item can be sofened then rehardened.  Heat to dull red in forge,turn fuel off,close forge tight and alow to cool as forge cool's.  Thin or very small item will benifit from having a bulker piece heated and cooled along with item.  With uninulated forge,torch or campfire heated item,bury it in warm sand and alow to cool.  Once bending and shaping is complete,item is heated and alowed to cool in air or quinced in oil or water.
Reply:

Originally Posted by Jax

... With uninulated forge,torch or campfire heated item,bury it in warm sand and alow to cool.  Once bending and shaping is complete,item is heated and alowed to cool in air or quinced in oil or water.
Reply:When Ford first tried to make car bodies with less steel,, it was 1957,,Ford simply replaced the steel previously used with thinner ,, but, MUCH higher level cold worked material.The cold work was supposed to replace the strength that was lost by making the body steel thinner.The increased cold work caused the car bodies to rust like crazy,,oxidation is GREATLY enhanced by stress when moisture is also present..That is why,, by 1959 or 1960, virtually EVERY 1957 Ford in Pittsburgh had the headlights falling out from rust,,Within a few years, Ford figured out that alloying the steel could reduce the rapid rusting,, but, that did nothing for my BIL,, he could not keep the headlights in that 1957 Ford,,A couple years later the car was scrapped,, because of rust.
Reply:

Originally Posted by SweetMK

That is why,, by 1959 or 1960, virtually EVERY 1957 Ford in Pittsburgh had the headlights falling out from rust,,