Im welding some 1/2 and 3/8 a36 plate to some 10 x #33 I-beam. The plates have been plasma cut by one of our cnc plasma cutters in various shapes; base and cap plates, knee brace mounts etc... Im using a miller deltaweld 452 with a 70 series wire feeder, running .045 dual sheild. I have the the machine set at 25 volts, with a wire speed of 450. Im using airgass blueshield (85% argon 15% co2). All the welds have been applied in the horizontal position. The problem is that some of the welds have cracked out after they have been welded. There is a hairline crack that runs directly down the center of the weld. I have tried to be detailed in the explanation of the problem. If anyone could give me some advice as to the cause and what I can do different it would be much appriciated. Thanks again
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Flux core cracking out