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Questions tagged [metals]

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dielectric unions and bonding continuity

I am a layperson not an engineer. In the diagram below showing an old house with a mix of copper and galvanized steel water pipes connected by a dielectric union, with the two dissimilar sections of ...
Tim's user avatar
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1 vote
1 answer
37 views

Elongation before plastic deformation

As far as I understand elongation is the lengthening of a metal in % of it's initial length right before it breaks. But what is in practice more interesting (for some aspects of my bike use case) is ...
aehhhhmm's user avatar
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0 answers
44 views

Vibrating hollow sphere

I would like to make a hollow sphere that can vibrate like a tuning fork. It should go like this: Place the sphere on a table Strike the sphere with something like a spoon The sphere vibrates (...
Riemann's user avatar
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0 votes
0 answers
64 views

Induce vibration on metal ball

Suppose that I have a hollow, metal ball that lies on a table. How do I induce a vibration on this ball? I want to be able to control the frequency, so it is a forced vibration (not natural vibration)....
Riemann's user avatar
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0 votes
2 answers
80 views

How is this metal, hollow sphere manufactured?

I just came across this sculpture and am really interested in knowing how it could even be done? I thought that they put 2 hemispheres together but there isn’t any weld lines- is there any other ...
JJonah's user avatar
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0 votes
1 answer
89 views

How to go from a metal sheet to a metal box using (set of) dies only?

As a hobbyist, how to go from a metal sheet to a metal box (1 hollow side) by using (set of) dies only? All videos I watched involved : bending 1 side at 90° then A) cut twice and discard a square ...
v1nce's user avatar
  • 101
1 vote
1 answer
646 views

What is the ideal oil for an electric razor?

As in the title, what is the ideal oil for an electric razor, and why? I might add that the electric razor will only be used at room temperature. What oil would an engineer select for their electric ...
AlphaCentauri's user avatar
0 votes
1 answer
52 views

Relationship between how fast a metal cylinder can spin on its axis without breaking or deforming?

For simplicity sake consider a solid metallic cylinder which is $2r$ in height with a radius of $r$. For a given metal and $r$, how to calculate how fast can this spin in terms of rpm for a very long ...
Hari Kumar's user avatar
0 votes
0 answers
42 views

Contactless heating of levitated tungsten

I want to make a setup to melt tungsten. The best method I've come up with is using an induction heater to levitate and heat the tungsten, in a vacuum to prevent oxidation and limit heat transfer. I'...
LostXOR's user avatar
  • 101
0 votes
0 answers
9 views

how to create a Ti V simulation cell with virtual cell approximation for density functional theory calculations

I would like to understand the method of creating simulation cells using the virtual cell approximation for different compositions of TiV using vasp
maheshwari meesa's user avatar
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0 answers
25 views

What grade of steel best suits this application?

Take a long, thin, straight wire with a circular cross section. Say, .5mm in diameter and 200mm in length. Hold the wire horizontally at one end (cantilever). What grade of steel would result in the ...
Joey Peluka's user avatar
3 votes
1 answer
230 views

How the choice of etchant can affect the severity of hydrogen embrittlement during pickling and passivation?

Following this question, I am trying to understand how/if the choice of acid we might use during the pickling and passivation of certain metals, can influence the severity of hydrogen embrittlement. ...
Foad's user avatar
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0 answers
33 views

Does anybody know anything about this patented, late-19th-century process for producing white lead?

I debated on whether to put this question in the History or Engineering Stack Exchange. Ultimately, I decided on the Engineering Stack because I believe the people on this site will understand the ...
Curious Layman's user avatar
8 votes
3 answers
2k views

Steel expanding in a tight space

Hypothetical question: What would happen if I were to cool down a steel cylinder to make it contract, and then slide it all the way into a cylindrical hole in a room-temperature solid steel box? The ...
Ram Rachum's user avatar
0 votes
0 answers
60 views

Grain size and fatigue performance correlation for AMS 5662 Inconel 718

I am trying to do a literature review on the correlation between average grain size and fatigue performance of AMS 5662 (solution annealed condition) Inconel 718. The Special Materials Corporation ...
Foad's user avatar
  • 249
0 votes
2 answers
83 views

Will hundreds of wood-burning fires damage 1/2" thick steel? [closed]

I have 1/2" and 3/8" thick x 24" diameter steel pipes that are typically used for natural gas transport, but in my case they take the shape of horizontal wood-burning cookers. I am ...
Behacad's user avatar
  • 101
2 votes
1 answer
98 views

Why 95% Water is used Instead of 100%

So in this video(https://www.youtube.com/watch?v=v1z829NF9PA) at around 2:35 it says that the alluminium ingots for alluminium foil, after being heated, are cooled down with a mixture of 95% water, 5% ...
MeltedStatementRecognizing's user avatar
1 vote
0 answers
15 views

MMPDS Coordinate System Adoption

How was the L, LT, ST coordinate system developed and adopted? I am talking with some colleagues about comparing metallic and non-metallic materials. Obviously, "apples-to-apples" ...
PipperChip's user avatar
0 votes
0 answers
20 views

Cutting method, where shaving stays attached from one side

Usually shaving goes out in front of the tool, being connected only along the cutting tool width. Im interested in another case, when shaving is moved to one side and it stays connected to the ...
Surprised Seagull's user avatar
0 votes
2 answers
66 views

Building up worn steel via plating or other method?

I've asked several people and gotten mixed answers, so I've decided to post the question here. Can steel be electroplated onto steel to build up worn surface areas (I'm talking about less than a ...
Justify 's user avatar
1 vote
2 answers
367 views

Consumable arc welding Polarity Effect on heat input

why DCEP is generally used in consumable welding process? As per my understanding more heat is generated where the electrons collide(anode), so in consumable welding,we want deposition and also want ...
Crazy_Court651's user avatar
0 votes
1 answer
110 views

Iridium carbides in high carbon stainless steel

Has there ever been any high carbon stainless steel made with iridium as one of the alloy components? Is there any research in this direction? There is a paper from 2016 comparing various iridium ...
AJR's user avatar
  • 1
1 vote
1 answer
284 views

What is the difference between AISI 1015 and SAE 1015 steel? Are they the same?

I've been trying to understand the differences between the AISI and SAE naming systems, but haven't been able to completely figure it out yet. It seems like sometimes they are considered the same, but ...
TwoWaySpeedOfLight's user avatar
1 vote
0 answers
275 views

Alternatives to zinc die cast (Zamak)

I am working for a small domestic home appliance manufacturer and we are looking at ways to reduce our appliance's carbon footprint. Currently we use a lot of die-casted zinc-aluminum alloy (Zamak, ...
Harbinger_0569's user avatar
0 votes
2 answers
223 views

What material property (Young's modulus, HRC hardness, Max yield strength, etc) affects how easy it is to cut sheet metal?

Our team is looking for sheet metal that is easiest to cut (and paint over), so I was wondering if there was a specific material property (such as those listed in the title) that affected the ...
Lyrie Muse's user avatar
0 votes
1 answer
117 views

Are rusty stains allowed to happen with hot dip galvanized steel construction?

I ordered a fence and the provider agreed to deliver it made from hot dip galvanized steel covered with powder painted finishing. The price was significantly bigger thank with the electro ...
mkarczewski's user avatar
0 votes
1 answer
1k views

Choosing metal plate to spread point load

I have a heavy object standing on 4 legs (about 30 mm in diameter each) on a wooden floor. The object is soon going to become even more heavier and I am concerned the legs could penetrate the floor. ...
Greendrake's user avatar
0 votes
1 answer
128 views

Fire rated EN 13501-1 B-s1/s2, d0 sheets

I'm trying to learn more about the type of sheets I can get for a project, I would of course go for polycarbonate if not for its price, currently the project with PC will cost \$600-\$700 but I'm ...
Simon's user avatar
  • 115
2 votes
1 answer
226 views

Aluminium Bolt in Titanium Casing: Any Dangers of (Contact-)Corrosion?

Assumed we have a fuel flask that is made of titanium. The bottle will be filled with white gasoline when used. At the bottleneck there is a standardized thread manufactured into the titanium. Are ...
Dave's user avatar
  • 145
0 votes
1 answer
142 views

Is it possible to estimate the young's modulus of an aluminum alloy purely based off its alloy designation?

I recently had an interview where the interviewer asked what the young's modulus would be like for an alloy like 5052 versus 6061. was a bit stumped on this one, saying that 5052 might be lower ...
TwoWaySpeedOfLight's user avatar
2 votes
0 answers
230 views

What is the Specific Heat of Molten Bronze?

I have sources giving the specific heat capacity of bronze as 382 to 385 J⋅kg⁻¹⋅K⁻¹, or as 435 J⋅kg⁻¹⋅K⁻¹. I'm assuming the variation is due to different alloys being considered, which are not ...
Lawton's user avatar
  • 121
0 votes
3 answers
533 views

How long will it take to anneal at a lower temperature?

Someone is trying to anneal a brass casting to minimize the segregation of Zinc. He likes the results of annealing at 400 Celsius for 3 hours, but the high temperature produces problems with residual ...
jorkz's user avatar
  • 11
10 votes
1 answer
2k views

What kind of metal are eye glasses frames made from?

I've noticed that prescription eye glasses frames are often made from metal that is quite rigid. It's surprisingly difficult to bend the metal, despite how thin it is. And if it does bend, it doesn't ...
User1974's user avatar
  • 399
2 votes
2 answers
141 views

What type of drill bits are these?

https://drive.google.com/file/d/1JPV6dRqB6f__N1eCcmn6QkOStLpVdc-U/view?usp=drivesdk Here's an image for bits Head. https://photos.app.goo.gl/HS8hFqLeWn8jecka7 In the image above (Google Images & ...
Alaaj99's user avatar
  • 21
0 votes
0 answers
159 views

What is the difference between wrought aluminum and cast aluminum? Is it possible to cast 6061 aluminum?

I'm currently learning about material properties and I'm not certain what the main differences are between the different types of aluminum. The aluminum I'm most familiar with is 6061-T6 aluminum and ...
TwoWaySpeedOfLight's user avatar
1 vote
3 answers
806 views

Software for designing products made of aluminum extrusions

I'm going to build a storage cabinet out of aluminum extrusions. Something that looks like that, except lighter and less intricate: So yeah, my cabinet will be a lot lighter and without moving parts. ...
Ram Rachum's user avatar
0 votes
2 answers
98 views

In what way does plating a bimetallic strip affect its displacement?

I've got a mechanism that uses a bimetallic strip; for aesthetic reasons I'd like to electroplate it with a thin layer of gold - how does this affect the relative displacement of a bimetallic strip in ...
T.S's user avatar
  • 113
1 vote
1 answer
51 views

How does the magnet sheet sliding metal mechanism work?

I was watching this video - at 10:23 mark where the person was using a hook mechanism for sliding the metal sheets together and noted that sometimes the hook would get caught on a bad angle. To solve ...
PerplexingParadox's user avatar
1 vote
3 answers
290 views

What is the cheapest way to build a fireproof box?

I'm breaking my brain for a two weeks trying to find a way to build a fireproof box 100 cm × 100 cm × 100 cm with 1 door at the cheapest price. The immediate candidate is sheet metal, which needs to ...
Simon's user avatar
  • 115
8 votes
2 answers
2k views

Unknown metal-piece connected to the case of an iPod Nano 2

I disassembled an iPod Nano 2 yesterday and was surprised to find a round brass-coloured plate glued to the back. I didn't find any mention of it at the teardown over at ifixit.com, as they didn't cut ...
eugen_e's user avatar
  • 83
1 vote
1 answer
1k views

What is meant by soaking time in heat treatment?

After heating at 950°C and holding the temperature for 3 hours there is a soaking time that is provided for 12 hours. What is the soaking time being referred to here? A detailed reply to this will be ...
gateprep's user avatar
  • 123
0 votes
0 answers
36 views

A question on how heat treatment is done in bogies

During heat treatment of metals I find that Normalizing is done in railway bogies and tempering is done following normalizing only for the CP top and bottom. Following the tempering process quenching ...
gateprep's user avatar
  • 123
0 votes
1 answer
41 views

Adhesive to connect metal with a coating to plastic that resists mineral oil

I have a peristaltic pump that was having some leaks because of connections between the tubing so I decided to replace it all with a single piece of tubing. Upon doing this though, I observed that the ...
WnGatRC456's user avatar
0 votes
1 answer
89 views

How to evenly heat stainless type 304 steel bar to approximately 200F?

I need to heat stainless bar stock prior to bending in a forming machine. I would like to reach approximately 200 degrees F. The material is stainless type 304/304L, 3/16" thick. We are heating ...
PMetal's user avatar
  • 1
3 votes
1 answer
422 views

Can Rotary Friction Welding be used to join metals and ceramics?

Is Rotary Friction Welding a good method to join cylinders of a metal (such as Ti alloy) and a ceramic (such as SiC). I know that Diffusion bonding can be used in such cases. However, it has its own ...
user0's user avatar
  • 131
1 vote
1 answer
582 views

Salt grinder and corrosion

I am looking for a kitchen salt grinder. I know salt is an aggressive compound and it needs a little bit of attention when we design products. Since most of grinders have plastic-made or stainless ...
mattia.b89's user avatar
0 votes
1 answer
39 views

I need something similar to a 3" to 5" curtain tension rod to fix my popping air ducts

The air ducts in my house have a couple of places where they make popping sounds as they expand while heating, one of the loudest ones is annoyingly in my bedroom. I know by pressing around where I ...
user24950814234's user avatar
4 votes
2 answers
573 views

Why does corrosion take place at certain stressed regions?

Why does certain parts of metal show more corrosion at the place where there is high dislocation density in comparison to the place where the dislocation density is less? I do sincerely feel that this ...
user586228's user avatar
1 vote
2 answers
679 views

Mirror without glass?

I just noticed "mirror" was actually created by applying thin layer of metal on top of glass. In fact, the polished metal is exactly how mirror gets its properties - while glass itself is ...
gijoe's user avatar
  • 83
0 votes
1 answer
43 views

Glue a sample at -40 Degrees

I would need to stick two opposite edges of a sample on two small metallic plates (as it were a bridge). The sample is Silicon and on top an high temperure superconductor which is Temperature ...
Mickey Martini's user avatar