I have heard that spray arc (on mild steel) must be done in flat position unless pulsed and that is what our testing has shown as well. My rep says otherwise and I was wondering what other people's experience was. Also one of my students asked how it is that the pulsed spray seems to defy gravity and find its way to the joint. I could not give him a good answer. Take a shot at it?
out of position spray arc
Mar 31, 2009
5 Replies
It has to do with surface tension and chill factor. Molten steel is not like water. It is more like honey. The trick of all out of position welding is balancing weld speed against surface tension and how fast the bead can cool to solid.
By pulsing the weld, the chill effect will solidify the weld between pulses.
MIG Spray is really liquid.
But neither honey or water defies gravity. Why does the pulsed MIG go so weetly out of position?
Thick liquids do defy gravity for a short period of time. It is all about time. If you can freeze a drip before it leaves the surface then it stays in place.
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