travel speed wont have much or any effect on how the wire burns, you just get a fat or skinny weld, do some thing for me, get a piece of 1/4 plate, keep it small say 4x4 inchs so it gets hot, set your machine at 5 low range and wire speed at 39-40, clip the wire, hold the gun straight up ( this is for a flat weld). get comfortable so you can see the wire when welding, pull the trigger and push the gun and puddle, keep it close to your work, check your cone as posted earlier, do you know the difference of push or pull. with a test plate this small you will get results quickly, that should lay down a nice bead, 3/8 to 1/2 wide a slight hump in the middle with the sides fused nicely to the plate, it will change as the plate heats up , keep the settings the same. if this dosent give you a good weld you could have to replace what i mentioned earlier or, heres a big 1, do you have the wire spool tension, the roller tension correct, is the liner in the gun hanging up, if any of these are off your welds will look like yuk, alwaws keep your gun cable straight, not all curled up, if your wire is burning back and spitting out, this is an area to investigate, once you get it down,get a closepin, small piece of paper towel, clamp the paper with the cloths pin onto the wire just as it leaves the spool, it will stop at the roller adjuster, leave it there, replace paper every few months, this will keep your liner clean, give it a go
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melted drop on MIG wire?