Hello all, I'm new to the forum and am looking for some help with a problem I am having with some pipe welding. I'm working on creating a robotic pipe welder, it uses a Miller XMT 300, and completes the weld on the inside of the pipe by going from 6 o'clock to 12 o'clock, vertically up one side and then vertically up the other. It basically rotates around the center of the pipe, so the distance from the tip to the pipe wall is always constant, and we can change the rotation speed of the tip and the wire feed speed on the robot. The pipe is 3/8" thick, 23" diameter steel. From 9 o'clock upwards, where gravity is pulling away from the pipe, the weld starts forming progressively larger stalagmite buildups and eventually just doesn't fuse to the pipe at all. We're running at 25 volts (CV setting) and a 100% inductance - the weld is fine for the bottom half but just horrible for the top half. Any helpful tips would be appreciated and I know that I'm probably not giving enough information, so let me know what other things you need to know to help.
cheers.
cheers.