my welds are anyoing

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ok, so yesterday i picked up a new welder i got home set it all up and started to have ago, i was welding think steel to thick steal so i tacked it together, then i sarted to weld it down the seam - after i was done it was super messy i mean there was slag everywhere and blobs of metal surounding it i picked up the brush and pik and chipped away it looked ok but it still looked bad, im using a no cash mig, i was on max setting and 6 wire feed.so why is it happening?
Reply:Firt, why not try two pieces of similar thickness, much easier for a first timer.  Are you using gas or flux core?  Is the metal clean, no rust or coatings?
Reply:flux core, the metal is clean and it is the same thickness
Reply:i was jost told on the phone by a mate he used to be a fabricator when he lived in the north of uk, anyway were building a bmx ramp and where going to make the frame work with the welding so he said he will sort it out if theres a problemthanks thoigh-Ryan
Reply:Sounds like a gas or not enough amp problem to me.Drivesector Hobart Handler 140Hobart Handler 180Ready Welder 2Hobart Air Force 400Airco Stinger 225Of all the things I've lost, I miss my mind the most."OZZY"
Reply:today i welded again it was great looks fine, when i chainged wire i turned machine to max and wire feed 10 i was welding some thick stuff and all i got was a shallow pool and then i moved slower and it burned through!
Reply:If FCAW, is your polarity set at DCEN, electrode negative?What machine?  Telling us a relative setting is useless if we don't know the machine.How thick is thick steel?
Reply:it goes back to practice practice       speed  and temp  it will get there keep up the  practice mig is about the fine tune
Reply:polarity