General Questions

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I have a couple of general MIG questions... I am welding in spray 28V and 280 ws I believe, with .045 ERS70-6 wire. onto 5/16" thick 44W material, using blueshield 7 First question I have is sometimes I have wire sticking out of my weld when I am finished and I can not remember why this is.. Second question is it sometimes feels like the wire is punching into the material before the puddle forms, I'm not sure why this is, I feel it is the ground connection but I have looked at the ground itself and all looks good.and the third and last is at the ends of my welds I sometimes have a hole, I have tried finishing my weld and staying still to allow my post flow to protect the finish, I have tried backing up further then normal I have also tacked the end of the weld, all of which helps but not all the time and I want to figure this out so to save time on the cleaning of my parts.Any help to these questions would be greatly appreciated
Reply:Goodwin:   Given the voltage and wire speed and electrode diameter, you are in globular transfer, not spray arc. What is the specific gas mixture of Blue Shield 7? Depending on the actual composition of the Blue Shield 7, you should be in the 420 - 500 ipm wire feed speed range and you might be able to drop your voltage to around 26V. By moving from globular to spray arc, most of the issues will end.