Posted by Ultradog MN on October 26, 2018 at 19:34:07 from (172.58.84.74):
I didn't want to hijack David G's post below. When I lived in Anchorage back in the 80s I worked for a while as a welder in a huge engine rebuilding shop. In Alaska there are a lot of villages that generate their own power. I worked on the heads for some 1K HP Enterprise engines that had individual heads for each cylinder. Iirc they were about 24"? in diameter. The machine shop would mill out the valve seats in the head, then I would weld in about a 1/2" base of stainless with the heliarc machine. It went to get that cleaned up on the mill, then I would get it again and heliarc in the valve face with stellite. Then they ground that to specs. I heated the head in a big oven first for a couple of hours then wrapped it in a thick heat blanket while I welded on it. They had a little electric rotary table with a foot feed and I heliarced stellite on the valves too. It was hard to remember to press the heliarc with one foot and make the rotary table turn with the other foot on that pedal. The valves were maybe 4" in dia and weighed 10 lbs each. I can't remember if I had to post heat the heads or not. This was in 84 so my memory may be off a bit on the numbers now too but I'll bet they're close. I do remember calculating how much stellite I was using up. The stuff was like $350 a lb then and I'd go through a couple of pounds on a head. Just reminiscing about an interesting job I did for a while...
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