Why don't metals bond when touched together?
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Why don't metals bond when touched together?
1–10 of 27 posts
Re: Why don't metals bond when touched together?
#2This is a major reason why the practice of welding, and soldering, is so complicated.
A lot of what makes welding and soldering complicated is the need to remove, or avoid creation of, the oxide layers that inevitably form on the surfaces of metals. More so, these oxides form faster at higher temperatures. That's why solder wire and stick welding electrodes have flux cores or coatings, why MIG/TIG welding uses a shielding gas, and so on.
Re: Why don't metals bond when touched together?
#3Re: Why don't metals bond when touched together?
#4You're just not pushing hard enough.
Re: Why don't metals bond when touched together?
#5Fun fact: ultrasonic vibration can weld metals together (and this is used in modern wire bonders).
Re: Why don't metals bond when touched together?
#6This is a major reason why the practice of welding, and soldering, is so complicated. A lot of what makes welding and soldering complicated is the need to remove, or avoid creation of, the oxide layers that inevitably form on the surfaces of metals. More so, these oxides form faster at higher temperatures. That's why solder wire and stick welding electrodes have flux cores or coatings, why MIG/TIG welding uses a shie…
I highly recommend everyone take a Welding 101 and 102 class at their local community college. While my primary trade is IT, I'm certified to weld, and I personally think its a lot of fun. It's about not only knowledge, but skill and experience.
You'll be satisfied when you're able to successfully move the "puddle" of molten metal down your weld line, the weld looks beautiful, and then you find out your weld is extremely strong when its destructively tested.
Re: Why don't metals bond when touched together?
#7Correct me if I'm wrong but isn't this why panning for gold in rivers was so prevalent through history? Flecks of gold would naturally cold weld over a millennium of being knocked around in the water.
Re: Why don't metals bond when touched together?
#8This is a major reason why the practice of welding, and soldering, is so complicated. A lot of what makes welding and soldering complicated is the need to remove, or avoid creation of, the oxide layers that inevitably form on the surfaces of metals. More so, these oxides form faster at higher temperatures. That's why solder wire and stick welding electrodes have flux cores or coatings, why MIG/TIG welding uses a shie…
I highly recommend everyone take a Welding 101 and 102 class at their local community college. While my primary trade is IT, I'm certified to weld, and I personally think its a lot of fun. It's about not only knowledge, but skill and experience. You'll be satisfied when you're able to successfully move the "puddle" of molten metal down your weld line, the weld looks beautiful, and then you find out your weld is extre…
I was going to say this too! I own a TIG and a MIG- welding is alot of fun and the science behind it is interesting.
A perfect combination of science and dexterity.
Need projects? Make furniture or buy an old car! Rust repair without "bondo" is an art!
Re: Why don't metals bond when touched together?
#9There is galling:
http://en.wikipedia.org/wiki/Galling
and galvanic corrosion:
http://en.wikipedia.org/wiki/Galvanic_corrosion
In short, they do, given friction and/or moisture, and time.
Re: Why don't metals bond when touched together?
#10Fun fact: ultrasonic vibration can weld metals together (and this is used in modern wire bonders). https://en.wikipedia.org/wiki/Wire_bonding
Another fun fact: there's a company using ultrasonic metal welding for 3D printing. They call it Ultrasonic Additive Manufacturing.