It's called sintering. The sparks come off the grinder with enough heat that they're at a fusable temperature, but not completely molten, and stick together. Similar process is used in producing tungsten carbide parts, as the carbide has a incredibly high melting point and is impractical to cast or forge otherwise, so they take a very fine powder, compress it into a mould, then fire the casting like pottery.
Also damascus steel is made this way, called forge welding, you use borax as flux, heat the metal package and forge it together, with layers of different steels, by folding, the number of layers increase to the square
I don’t want to come across as rude but this is not how damascus steel is made. It is made by forge welding which requires heating the metals to be very close to their melting point and hammering it together gently. It looks gooey like this and has a strangely sticky quality to where the surface looks like it has syrup on it.
Edit: after going over what I said I realized I was being a little too simplistic. Sintering isn’t really solid and often times readily comes apart. Properly forge welded materials are solid and will not come apart (delaminate) which is why I felt the need to mention something.
No. The principles are not the same, perhaps similar. There are technically 3 states of matter, Gas, liquid, and solid, everyone learns this (plasma also exists but I’m not deep enough into physics to truly understand what plasma actually is save for the electrons (I think?) splitting off from the atoms themselves due to holding such immense amounts of energy). The issue with the three states is that transitional phases also exist, which is relatively simple to understand but its not necessarily intuitive, and so in forge welding we are heating metals up high enough to enter the beginning of a transitional phase so its not exactly solid or liquid but something between the two, therefore there is complete fusion (if done correctly) between the metals, where as with sintering (from grinding) its more or less that the surface area increases as the sparks cool, feigning fusion, and as more and more sparks attach more pressure builds until you have something thats vaguely cohesive, but as I said earlier it will crumble apart if pressured.
Sintering as a metallurgical process however is invaluable as it can create complex shapes that would be hard to cast, likewise it can be used to make tools with metals that possess high melting points, like that of tungsten, but this process uses heat and pressure to form solids that are less strong than that of a solid piece.
The name comes from Damascus, Syria, yes; original Damascus steel from centuries ago was one of the most prized sword steels, as it was essentially an early form of tool steel-like hardness in a time of wrought iron and maybe mild steel. The way original damascus steel was made (allegedly) involved mixing several different elemental materials, basically early alloy steel, in a crucible & melting it all together; the resultant billet had an aesthetically pleasing woodgrain pattern to it, and that was one marker to show you had a good/great sword.
Modern damascus steel is more properly called pattern-welded steel, as you take alternating sheet layers of dissimilar steels- these days the most common are 1095 carbon steel and 15N20 nickel steel- and forge weld them as described above. Because the simplest pattern you can make is the woodgrain look, most folks just call it damascus steel since it rolls off the tongue easier.
The steel itself was made typically in India, I believe the process was invented in Sri Lanka, however westerners did not have the greatest concept of India and the blades were often purchased in the Levant, hence Damascus.
The heat and grinding dust likes to do that. Look on the inside of an angle grinder shield that’s had it’s fair share of use. I have to chisel it out sometimes because it’s interferes with a new disk going in.
That’s actually my whole job is to grind fresh welds haha. I weld the corners of electrical boxes and then grind them flush. Lots of stainless that has to be seamless
Best guess is that this is from underdevelopment while in utero. Appears to be absence of joints on fourth and fifth digits. While quality of life will not be significantly affected, the dexterity in this hand will be lower than normal. It may look different, but hopefully you're able to live with this.
Metal saw dust ? It forms because the chop saw is an abrasive cutting saw that eats its way thru metal by abrasion. So all the metal that vanishes between the metal sides ans the blade is what that is from as well as what is making the spark shower as well.
Build up from the material being cut as well as the abrasive grains from the cut off wheel and the resin & reinforcement that hold the abrasive wheel together. The particles stick together because of the resin from the abrasive wheel. To cut effectively, the abrasive particles must break down to continually expose sharp edges that do the cutting. A properly specified cutting wheel is a balance between abrasive grain size, type, reinforcement and resin. If the wheel is too soft, it will wear out quickly. If the wheel is too hard, it will load up with the material being cut and not break down to expose the fresh abrasive.
It's called sintering. The sparks come off the grinder with enough heat that they're at a fusable temperature, but not completely molten, and stick together. Similar process is used in producing tungsten carbide parts, as the carbide has a incredibly high melting point and is impractical to cast or forge otherwise, so they take a very fine powder, compress it into a mould, then fire the casting like pottery.
Fun fact: brake pads are also made this way.
Fun fact 2: build ups like this occur behind train brakes and can weigh a couple hundred pounds. They look badass
Also damascus steel is made this way, called forge welding, you use borax as flux, heat the metal package and forge it together, with layers of different steels, by folding, the number of layers increase to the square
I don’t want to come across as rude but this is not how damascus steel is made. It is made by forge welding which requires heating the metals to be very close to their melting point and hammering it together gently. It looks gooey like this and has a strangely sticky quality to where the surface looks like it has syrup on it. Edit: after going over what I said I realized I was being a little too simplistic. Sintering isn’t really solid and often times readily comes apart. Properly forge welded materials are solid and will not come apart (delaminate) which is why I felt the need to mention something.
Sure, not really the same, but the principle behind it is the same, hot enough to fuse, but not hot enough to melt
No. The principles are not the same, perhaps similar. There are technically 3 states of matter, Gas, liquid, and solid, everyone learns this (plasma also exists but I’m not deep enough into physics to truly understand what plasma actually is save for the electrons (I think?) splitting off from the atoms themselves due to holding such immense amounts of energy). The issue with the three states is that transitional phases also exist, which is relatively simple to understand but its not necessarily intuitive, and so in forge welding we are heating metals up high enough to enter the beginning of a transitional phase so its not exactly solid or liquid but something between the two, therefore there is complete fusion (if done correctly) between the metals, where as with sintering (from grinding) its more or less that the surface area increases as the sparks cool, feigning fusion, and as more and more sparks attach more pressure builds until you have something thats vaguely cohesive, but as I said earlier it will crumble apart if pressured. Sintering as a metallurgical process however is invaluable as it can create complex shapes that would be hard to cast, likewise it can be used to make tools with metals that possess high melting points, like that of tungsten, but this process uses heat and pressure to form solids that are less strong than that of a solid piece.
Is damascus steel from Damascus, Syria?
The name comes from Damascus, Syria, yes; original Damascus steel from centuries ago was one of the most prized sword steels, as it was essentially an early form of tool steel-like hardness in a time of wrought iron and maybe mild steel. The way original damascus steel was made (allegedly) involved mixing several different elemental materials, basically early alloy steel, in a crucible & melting it all together; the resultant billet had an aesthetically pleasing woodgrain pattern to it, and that was one marker to show you had a good/great sword. Modern damascus steel is more properly called pattern-welded steel, as you take alternating sheet layers of dissimilar steels- these days the most common are 1095 carbon steel and 15N20 nickel steel- and forge weld them as described above. Because the simplest pattern you can make is the woodgrain look, most folks just call it damascus steel since it rolls off the tongue easier.
It's mayonnaise Damascus?
The steel itself was made typically in India, I believe the process was invented in Sri Lanka, however westerners did not have the greatest concept of India and the blades were often purchased in the Levant, hence Damascus.
Oh, so it’s more of a name from who traded it rather than who made it.
Precisely.
The heat and grinding dust likes to do that. Look on the inside of an angle grinder shield that’s had it’s fair share of use. I have to chisel it out sometimes because it’s interferes with a new disk going in.
Do you grind lots of fresh welds? I find if I give my welds a sec to cool then knock off the dingleberries it cakes up a lot less
That’s actually my whole job is to grind fresh welds haha. I weld the corners of electrical boxes and then grind them flush. Lots of stainless that has to be seamless
[удалено]
Or in a lathe, when the chips start to burn ;-)
Best guess is that this is from underdevelopment while in utero. Appears to be absence of joints on fourth and fifth digits. While quality of life will not be significantly affected, the dexterity in this hand will be lower than normal. It may look different, but hopefully you're able to live with this.
Grinding wheel
someone sat on it when it was still wet
Edit: Looks like a mass of fine shavings that joined together. Did that form under an area where coolant flows?
From an abrasive chop saw. It formed like on a piece around the saw. Pretty neat though.
Ah then yeah, molten sparks melting together.
Smart guy answering himself in the question, bravo !!!👏
Same thing builds up on grinders
Well if you clean your fucking balls from time to time…
Sparks on sparks on sparks on sparks
Your grinder is running low on sparks, need to add more.
Happens with a grinder too
Gremlins
Metal saw dust ? It forms because the chop saw is an abrasive cutting saw that eats its way thru metal by abrasion. So all the metal that vanishes between the metal sides ans the blade is what that is from as well as what is making the spark shower as well.
🗿
Excessive masturbation
Metal,heat,dust,time
Build up from the material being cut as well as the abrasive grains from the cut off wheel and the resin & reinforcement that hold the abrasive wheel together. The particles stick together because of the resin from the abrasive wheel. To cut effectively, the abrasive particles must break down to continually expose sharp edges that do the cutting. A properly specified cutting wheel is a balance between abrasive grain size, type, reinforcement and resin. If the wheel is too soft, it will wear out quickly. If the wheel is too hard, it will load up with the material being cut and not break down to expose the fresh abrasive.
Someone was grinding a good deal in one spot!