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Old 09-06-2019, 03:31 PM
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Mark Rosenbaum Mark Rosenbaum is offline
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Moly element failure

We are going through a crucible change for our 400# Stadelman furnace and finished and turned on the furnace and it started to spark from this element. It is a new element with a new strap. At first it broke off right at the line between the light gray and dark gray of the element. After taking off the top piece that broke away, we tried to attach the straps to just the remaining dark gray length. Turned it on and continued to get more sparks. Unfortunately, this was the 3rd element that we replaced today, and our last spare.
We have another older one that we replaced because it broke off on the same line that we will try and put back in service...
Any ideas why this may be happening???
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Old 09-06-2019, 05:32 PM
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Pete VanderLaan Pete VanderLaan is offline
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It sounds like it was cracked in more than one place.
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Old 09-06-2019, 06:29 PM
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Quote:
Originally Posted by Pete VanderLaan View Post
It sounds like it was cracked in more than one place.
I guess... it tested out, but when we turned on the juice, kaPOW!!!!
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Old 09-06-2019, 08:19 PM
Brian Wong Shui Brian Wong Shui is offline
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Maybe some twisting going on while the straps were being tightened or maybe over tightening the strap (ie crushing the shank and causing cracks).
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Old 09-07-2019, 08:17 AM
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When I've seen this happen, it invariably comes from an overtightening of the strap. In testing , the crushed material still conducts and shows continuity but once power is applied it expands rapidly and shows the failure. I have so far not seen one do it in two places but it's the likely explanation.
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Old 09-08-2019, 10:19 PM
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Ah man this is really a hard blow. I sympathize.

I have two spare elements at the shop but I am almost positive they are the size smaller than you use. If however, they are the same size I am happy to help. They are the smaller of the two that Steve pushed out the door and where on Ardin's furnace. Give me a call if you think might need one.
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