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Old 04-02-2021, 09:05 AM
Josh Bernbaum Josh Bernbaum is offline
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Noise while heating mild steel?

Sry, I don't know what to title this thread, hope it's not misleading. Just more of a curiosity for me than any sort of a problem, but I welded up a new pastorale (sp?) fork a couple months ago out of some mild steel to replace the old one I used for 10 plus years. This is for heating up plates of cane in the GH. The old one never made any noise when it got hot, but for some reason this new one started making a 'tink, tink, tink' sound (rapidly and repeatedly) after just one or two heats when the metal started heating up. My guess is it's some kind of expansion/contraction thing? What's even more interesting to me is that, although not fully stopped at this point, the noise has almost gone away after a couple months of use. (I don't use it everyday) So what do you think has happened to the steel after a couple months? Has something happened at a molecular level to silence what I'd been noticing? Again, just a curiosity, and to see what a possible explanation might be.
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Old 04-02-2021, 10:05 AM
Eben Horton Eben Horton is offline
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Expansion. Have you ever been in an old house with steam heat and cast iron radiators?? They bang.
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Old 04-02-2021, 10:16 AM
Josh Bernbaum Josh Bernbaum is offline
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Well, yeah, I know what you're saying about radiators. But I'm still curious why it would stop making that noise after a while with my fork. Did the steel get 'seasoned' over time somehow? That doesn't seem to be the case with old cast iron radiators anyway, they keep making noise after years and years.
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Old 04-02-2021, 12:44 PM
Kenny Pieper Kenny Pieper is offline
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Josh if your welds did not penetrate all the way through the joint it could be you are hearing the metal moving around in there.
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Old 04-02-2021, 12:46 PM
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Pete VanderLaan Pete VanderLaan is offline
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I agree with Kenny
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Old 04-02-2021, 03:29 PM
Josh Bernbaum Josh Bernbaum is offline
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Okay, perhaps. But although I'm not an expert welder, I do feel like I've gotten good penetration on the thousands of welds I've done in my life. But no one's x-raying my welds, and I'm sure they wouldn't let me do welds on a nuclear submarine, so maybe you're right. However, even though I find myself not confident of most things in life, I would indeed sleep under something I welded without any reservations. What's still not explained by what you're saying though, is why did the sound stop after a couple months?
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Old 04-02-2021, 03:48 PM
Eben Horton Eben Horton is offline
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I think the steel degrades with a bunch of heat cycles. I christened a new blow pipe last month and it banged on me. I was shocked
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Old 04-02-2021, 03:55 PM
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think more likely of abrasion. If two pieces don't normally touch when cold, that's where to start. Then heat the mass and it expands to the point where those pieces do touch, make a little noise passing each other but eventually, the passage abrades the contact, and it stops.

We see a similar effect in electrical contacts quite frequently. It's fine when it's cold but not once it expands. The electrical one we tend to notice more since it shorts things out.
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Old 04-02-2021, 04:34 PM
Kenny Pieper Kenny Pieper is offline
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Yea what Pete says
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Old 04-02-2021, 05:01 PM
Lawrence Duckworth Lawrence Duckworth is offline
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if your welds are as good as you say they are.. maybe it's the tuning fork shape
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Old 04-02-2021, 06:27 PM
Josh Bernbaum Josh Bernbaum is offline
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Haha, yup, tuning fork..
I'm liking the abrasion theory Pete, that does seem plausible.
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Old 04-02-2021, 10:29 PM
Marty Kremer Marty Kremer is offline
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Quote:
Originally Posted by Eben Horton View Post
Expansion. Have you ever been in an old house with steam heat and cast iron radiators?? They bang.
That's trapped air banging, not the cast iron.
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Old 04-03-2021, 02:51 PM
Eben Horton Eben Horton is offline
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Quote:
Originally Posted by Marty Kremer View Post
That's trapped air banging, not the cast iron.
Prove it. I do t believe you
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Old 04-03-2021, 04:15 PM
Michael Ahlefeldt-Laurvig Michael Ahlefeldt-Laurvig is online now
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Wrong welding rods?
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Old 04-03-2021, 06:33 PM
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Quote:
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Prove it. I do t believe you
***
Have you never listened to your water pipes after an airlock in the lines?
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Old 04-03-2021, 08:59 PM
Marty Kremer Marty Kremer is offline
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Quote:
Originally Posted by Josh Bernbaum View Post
..... What's still not explained by what you're saying though, is why did the sound stop after a couple months?
Needs new batteries.
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Old 04-04-2021, 08:44 AM
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the scraping of the metal was making noise but that was abrading the metal as well. Eventually, there was no contact, thus, no noise.
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Old 04-05-2021, 01:13 PM
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Franklin Sankar Franklin Sankar is offline
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Jumbles.
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