Metal Core?

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I heard of this process and dont know alot about it, will be working with it in the next few weeks and would like to get a lil info, any help??
Reply:You taking classes at PCT or doing it for a job?Have we all gone mad?
Reply:I know the basics of it, but have never actually ran the wire. Argon rich shielding (or pure Co2), longer stickout than what you would want with FC, recessed 1/8 to 1/4 inside the nozzle because of the heat, and Is limited to flat and horizontal positions. But my question is, is the major difference from solid to metal core that its faster but primarilly the same?
Reply:Local LWS recommended it at a former place of work for building tanks, 400 barrel and smaller. It had a high deposition rate and the welds looked real nice. They would have leaks where you couldn't see any visible flaws. I didn't care for it.Leo
Reply:we have used it on boilers passed all x rays, high deposition rate, low smoke and stuff all slag, splatter.I've only used the Lincoln MC-710-H
Reply:Metalcore is great stuff but takes getting used to.  If you ever lose shielding for a second you will get porosity and it will require gouging out the complete weld and often much deeper.  When welding on rusty metal often it is wise to use a slight forward and back whipping motion to create a elongated puddle.  This gives it time to boil the crap out of the steel before it solidifies.  I like slightly forehand but others like slightly back hand..... if in doubt just keep your gun perpendicular.  To get production 27 volts all the way up to 30  The arc should have a slight crackle.  A soft buzz will give you a smooth weld with no penetration. ... or lack of fusion at edges.  With ,045 I like around 27.5 volts and around 350 inches a minute.  Some guys can manage horizontal fillets at over 400 ipm but my beads start to roll over at the toe.
Reply:Metal cored wires combine some of the best traits of both solid wire and gas shielded flux cored wires.In general:Deposition rates are higher and therefore travel speeds are higher.  This can make a metal cored wire better for heavy weldments and welding sheet metal gage material as well.  Proper setup, different from either MIG or FCAW, is necessary to get the maximum benefits.Cost may be higher depending on the specific application, and filler metal product.Metal cored wires leave virtually no slag, so there's little or no cleanup required.  When looking at the cost of welding overall, this can mean big savings in labor costs.Some metal cored wires can be run in short circuit transfer, so they can be welded in all positions.  But many are designed to run in spray transfer mode, so they are typically thought of as flat/horiztonal welding products.  Pulsed spray can enable running these wires in all positions.Metal cored wires can be run with a variety of shielding gases.  Consult the product manufacturer's datasheets and follow their recommendations.Like solid wire MIG, push or pull techniques can be used when welding metal core wire.  The right technique depends on the specific application. Originally Posted by metalburnerI heard of this process and dont know alot about it, will be working with it in the next few weeks and would like to get a lil info, any help??
Reply:Thanks for the feedback, should help me in getting my feet wet with metal core. My welding book doesnt touch a whole lot on metal core, but does state that it was being used to fabricate a rocket launch tower for Space Launch Complex 37.