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Welcome to the board Dan, you came to a good place for some great answers. We also love to see pictures, the more the better. May I ask what part of Pa you are in ?
As far as vertical up....
Practice, practice and more practice. That is a tricky method and mine are still not as pretty as a lot I've seen. I'll let somebody else give you better details than I can. Do keep your rod at the right angle and don't have your amperage too high.
When my LoHy gives me problems uphill, I switch from the usual drag to a step (pipe) or weave (plate). Nothing too big, just enough to help the freeze. And like Kbar said, watch your heat. Hope this helps.
Ammonia refrigeration tech
Trailblazer 302 (yes, it's new)
Millermatic 180 w/Autoset
HF-15 High frequency
XR15 w/Push-Pull Gun
Victor O/A, DeWalt, North mask
"A professional knows what to do. A craftsman knows why."
My advise is to treat the center of the weld area like the "no stopping" zone at an airport, and the edges (toe) as the "unloading zone" only at this airport we never stop we get to kick the inlaws from the moving car and be on our way.
By doing a slight weave left to right and back never stopping in the center you create a shelf of slag and new weld material for the next weave to sit on.
"So in a way the vertical up is just o series of short horizontal welds laid on top of each other"? No but yes sort of in the vertical up it is one continuous weld. Done well it will have the stack of dimes look.